# DimMath — full rate data (llms-full.txt)

Carrier and Cubic tables are US domestic. Amazon tables use US marketplace FBA. US duty/MPF figures are for goods imported into the United States. Destination VAT/GST is labeled separately. Sourced from published carrier and agency fee schedules. Verify against the primary source before making a shipping decision.

DimMath is a set of shipping calculators and reference guides for US ecommerce sellers. Some tools run in the browser; DIM Weight and Carrier Savings also call DimMath's estimate API. Results are not live carrier quotes. Carrier and Cubic tools are US domestic; Amazon tools use US FBA; import duty is US inbound entry, not US-origin export. Concise index: https://dimmath.com/llms.txt

## Rate tables

Tables are copied from the same markdown that renders the HTML pages. Numbers are not retyped here.

### DIM weight divisors by carrier

Source: https://dimmath.com/blog/dim-weight-divisors-by-carrier-full-table/ (source post updated 2026-09-06)

*DIM Weight Divisors by Carrier & Service (current as of 6 September 2026)*

| Carrier | Service Level | Domestic divisor (in³/lb) | International divisor | Rounding | Size threshold |
| --- | --- | --- | --- | --- | --- |
| UPS | Ground, Air, 3 Day Select (daily / account commercial) | 139 in³/lb | Not published on this page — no named current UPS Rate and Service Guide section was cited in this audit | Each fractional dimension rounded up before multiplying (1.1 becomes 2). Then L×W×H ÷ 139, DIM rounded up to a whole pound. 2026 UPS Rate & Service Guide, Determine the Weight and Size — PACKAGE — For All Domestic and International Shipments (listed p.19 of the 7 Sep 2026 Daily Rates PDF). | No cubic-inch minimum in that PACKAGE section. Freight, retail/counter, and negotiated-contract DIM are not this rule. |
| UPS | Retail / counter (no account) | Not filled — retail versus daily divisor was not verified against a named current UPS guide section in this audit | Not filled | Not filled | Not filled |
| FedEx | Ground, Home Delivery, Express | 139 in³/lb | 139 in³/lb for U.S., Puerto Rico, and international shipments ([FedEx dimensional weight](https://www.fedex.com/en-us/shipping/packaging/what-is-dimensional-weight.html)) | Each dimension rounded up to the next whole inch (FedEx packaging page) | No cubic-inch exemption stated on that FedEx page |
| USPS | Ground Advantage (DMM 283) | 139 in³/lb when volume > 1,728 in³ | Not a Ground Advantage rule — Ground Advantage is a domestic product | Each dimension rounded up to the next whole inch ([DMM 283 §§1.4.1–1.4.2](https://pe.usps.com/text/dmm300/283.htm)) | DIM applies only if L × W × H > 1,728 in³ |
| USPS | Priority Mail (DMM 223) | 139 in³/lb when volume > 1,728 in³ | Priority Mail International is a separate product; this table does not copy a PMI divisor without a cited IMM section | Each dimension rounded up to the next whole inch ([DMM 223 §1.4](https://pe.usps.com/text/dmm300/223.htm)) | DIM applies only if L × W × H > 1,728 in³ |
| DHL Express | Express Worldwide | 139 in³/lb when billed in inches and pounds | 5,000 cm³/kg when billed in centimeters and kilograms | Ceiling to the next whole increment at sort (as described in DHL service materials; confirm the current DHL Express Rate Guide for your contract) | Typically all shipments; confirm contract |

*16 × 12 × 10 in (1,920 in³), 4.0 lb — current rules*

| Carrier / Service | Divisor | DIM calculation | Threshold | Billable weight |
| --- | --- | --- | --- | --- |
| UPS Ground (commercial daily / account) | 139 in³/lb | 1,920 ÷ 139 = 13.81… lb | No 1,728 in³ floor in these examples | 14 lb |
| FedEx Ground | 139 in³/lb | 1,920 ÷ 139 = 13.81… lb | No cubic-inch exemption on the cited FedEx page | 14 lb |
| USPS Ground Advantage (current) | 139 in³/lb | 1,920 ÷ 139 = 13.81… lb | Yes (> 1,728 in³) | 14 lb |
| USPS Priority Mail (current) | 139 in³/lb | 1,920 ÷ 139 = 13.81… lb | Yes (> 1,728 in³) | 14 lb |

### USPS Ground Advantage 2026 zone chart and weight breaks

Source: https://dimmath.com/blog/usps-ground-advantage-rates-zone-chart-weight-breaks/ (source post updated 2026-09-07)

*USPS Ground Advantage commercial parcels — ounce breaks by zone (under 1 lb), effective July 12, 2026*

| Weight | Zone 1 | Zone 2 | Zone 3 | Zone 4 | Zone 5 | Zone 6 | Zone 7 | Zone 8 | Zone 9 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Up to 4 oz | $6.93 | $6.94 | $7.30 | $7.46 | $7.69 | $7.86 | $8.07 | $8.40 | $8.40 |
| Up to 8 oz | $6.93 | $6.94 | $7.30 | $7.46 | $7.69 | $7.86 | $8.07 | $8.40 | $8.40 |
| Up to 12 oz | $6.93 | $6.94 | $7.30 | $7.46 | $7.69 | $7.86 | $8.07 | $8.40 | $8.40 |
| Up to 15.999 oz | $6.93 | $6.94 | $7.30 | $7.46 | $7.69 | $7.86 | $8.07 | $8.40 | $8.40 |

*USPS Ground Advantage commercial parcels — 1–20 lb by zone, effective July 12, 2026*

| Weight | Z1 | Z2 | Z3 | Z4 | Z5 | Z6 | Z7 | Z8 | Z9 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 lb | $7.61 | $7.68 | $8.00 | $8.15 | $8.74 | $9.63 | $9.98 | $10.67 | $10.67 |
| 2 lb | $7.99 | $8.08 | $8.26 | $8.51 | $9.95 | $11.58 | $12.00 | $12.87 | $12.87 |
| 3 lb | $8.64 | $8.66 | $9.14 | $9.67 | $11.57 | $13.59 | $14.36 | $15.75 | $15.75 |
| 4 lb | $9.28 | $9.34 | $9.70 | $10.65 | $12.84 | $15.16 | $16.19 | $18.01 | $18.01 |
| 5 lb | $9.70 | $9.76 | $10.14 | $11.02 | $13.48 | $15.89 | $17.12 | $19.19 | $19.19 |
| 6 lb | $9.87 | $9.94 | $10.36 | $11.55 | $14.28 | $16.89 | $18.31 | $20.68 | $20.68 |
| 7 lb | $9.96 | $10.02 | $10.62 | $11.90 | $14.90 | $17.65 | $19.23 | $21.83 | $21.83 |
| 8 lb | $10.10 | $10.27 | $11.49 | $12.43 | $15.49 | $18.34 | $20.08 | $22.90 | $22.90 |
| 9 lb | $11.01 | $11.25 | $12.39 | $13.65 | $16.11 | $19.13 | $21.01 | $24.09 | $24.09 |
| 10 lb | $11.91 | $12.26 | $13.18 | $14.44 | $16.76 | $19.94 | $21.97 | $25.34 | $25.34 |
| 11 lb | $12.75 | $12.94 | $14.00 | $15.18 | $18.12 | $21.28 | $23.68 | $27.37 | $27.37 |
| 12 lb | $13.49 | $13.85 | $14.63 | $15.89 | $18.86 | $22.20 | $24.78 | $28.73 | $28.73 |
| 13 lb | $14.15 | $14.48 | $15.25 | $16.53 | $19.62 | $23.16 | $25.87 | $30.11 | $30.11 |
| 14 lb | $14.73 | $15.07 | $15.81 | $17.13 | $20.38 | $24.14 | $26.99 | $31.53 | $31.53 |
| 15 lb | $15.23 | $15.53 | $16.31 | $17.67 | $21.15 | $25.13 | $28.11 | $32.91 | $32.91 |
| 16 lb | $15.64 | $15.91 | $16.73 | $17.94 | $21.89 | $26.09 | $29.22 | $34.29 | $34.29 |
| 17 lb | $15.97 | $16.29 | $17.15 | $18.41 | $22.51 | $26.85 | $30.11 | $35.42 | $35.42 |
| 18 lb | $16.21 | $16.46 | $17.61 | $18.94 | $23.16 | $27.70 | $31.09 | $36.64 | $36.64 |
| 19 lb | $16.38 | $16.82 | $17.81 | $19.36 | $23.79 | $28.52 | $32.07 | $37.84 | $37.84 |
| 20 lb | $16.46 | $17.06 | $18.03 | $19.66 | $24.93 | $30.32 | $34.67 | $40.39 | $40.39 |

### USPS Cubic tier tables and soft-pack rules

Source: https://dimmath.com/blog/usps-cubic-tier-pricing-full-rate-table/ (source post updated 2026-09-07)

| Tier | Volume       | Zone 1 | Zone 2 | Zone 3 | Zone 4 | Zone 5 | Zone 6 | Zone 7 | Zone 8 | Zone 9 |
| ---- | ------------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ |
| 0.1  | ≤ 0.10 cu ft | $9.06  | $9.34  | $9.73  | $10.50 | $13.02 | $14.69 | $15.39 | $15.51 | $33.09 |
| 0.2  | ≤ 0.20 cu ft | $9.10  | $9.39  | $9.78  | $10.79 | $13.17 | $15.34 | $16.31 | $16.37 | $34.94 |
| 0.3  | ≤ 0.30 cu ft | $9.45  | $9.71  | $10.75 | $12.68 | $16.56 | $18.86 | $20.51 | $20.57 | $43.91 |
| 0.4  | ≤ 0.40 cu ft | $11.06 | $11.29 | $12.63 | $15.12 | $20.23 | $24.88 | $27.25 | $27.30 | $58.28 |
| 0.5  | ≤ 0.50 cu ft | $11.59 | $11.70 | $13.23 | $16.10 | $22.31 | $27.27 | $30.24 | $30.56 | $65.23 |

| Tier | Example Box    | Cubic Inches | Cubic Feet |
| ---- | -------------- | ------------ | ---------- |
| 0.1  | 6 × 5 × 5 in   | 150          | 0.087      |
| 0.2  | 8 × 6 × 6 in   | 288          | 0.167      |
| 0.3  | 9 × 7 × 6 in   | 378          | 0.219      |
| 0.4  | 10 × 8 × 8 in  | 640          | 0.370      |
| 0.5  | 12 × 10 × 6 in | 720          | 0.417      |

| Tier | Volume       | Zone 1 | Zone 2 | Zone 3 | Zone 4 | Zone 5 | Zone 6 | Zone 7 | Zone 8 | Zone 9 |
| ---- | ------------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ |
| 0.1  | ≤ 0.10 cu ft | $7.45  | $7.51  | $7.83  | $7.99  | $8.49  | $9.21  | $9.53  | $10.13 | $10.13 |
| 0.2  | ≤ 0.20 cu ft | $7.82  | $7.89  | $8.14  | $8.34  | $9.37  | $10.66 | $11.05 | $11.84 | $11.84 |
| 0.3  | ≤ 0.30 cu ft | $8.39  | $8.45  | $8.81  | $9.23  | $10.96 | $12.83 | $13.48 | $14.67 | $14.67 |
| 0.4  | ≤ 0.40 cu ft | $9.07  | $9.13  | $9.51  | $10.34 | $12.43 | $14.66 | $15.61 | $17.29 | $17.29 |
| 0.5  | ≤ 0.50 cu ft | $9.59  | $9.66  | $10.03 | $10.93 | $13.32 | $15.70 | $16.89 | $18.90 | $18.90 |
| 0.6  | ≤ 0.60 cu ft | $9.84  | $9.90  | $10.31 | $11.43 | $14.10 | $16.68 | $18.05 | $20.36 | $20.36 |
| 0.7  | ≤ 0.70 cu ft | $9.94  | $10.00 | $10.56 | $11.82 | $14.76 | $17.47 | $19.02 | $21.57 | $21.57 |
| 0.8  | ≤ 0.80 cu ft | $10.08 | $10.23 | $11.34 | $12.34 | $15.39 | $18.22 | $19.94 | $22.71 | $22.71 |
| 0.9  | ≤ 0.90 cu ft | $10.84 | $11.08 | $12.24 | $13.44 | $16.01 | $18.99 | $20.84 | $23.89 | $23.89 |
| 1.0  | ≤ 1.00 cu ft | $12.02 | $12.34 | $13.28 | $14.54 | $16.93 | $20.11 | $22.18 | $25.60 | $25.60 |

### USPS Cubic eligibility (22-inch max, 20 lb, length + width)

Source: https://dimmath.com/blog/how-to-qualify-for-usps-cubic-22-inch-max-20-lb-max/ (source post updated 2026-09-06)

USPS Cubic pricing bypasses weight-based rates entirely for eligible packages. The savings are real $3 to $15 per shipment depending on weight and zone. But the eligibility rules are specific, and one dimension over the limit disqualifies the entire shipment.

This is the complete eligibility checklist, how to access cubic rates without a high-volume USPS contract, and what the July 12, 2026 compliance change means for sellers who ship commercially.

## **The Three Eligibility Requirements**

Every package must meet all three to qualify for USPS Cubic pricing. Failing any one of them disqualifies the package regardless of the other two.

**Requirement 1: Longest side must be 22 inches or under.**  
Measure the exterior of the packed, sealed package. Under USPS DMM 283.1.3.1 (https://pe.usps.com/text/dmm300/283.htm) for Ground Advantage and DMM 223.1.3.1 (https://pe.usps.com/text/dmm300/223.htm) for Priority Mail (effective July 12, 2026), the longest single dimension (length, width, or height, whichever is greatest) cannot exceed 22 inches. A box measuring 22.1 inches on any side does not qualify.

This is the most common disqualifier. Sellers with products that are 20–22 inches long often assume they qualify and discover at the label stage that one dimension is 22.2 inches.

**Requirement 2: Weight must be 20 lbs or under.**  
The fully packed scale weight including product, packaging, void fill, and tape must be 20 lbs or under (per DMM 283.1.3.1 (https://pe.usps.com/text/dmm300/283.htm) and DMM 223.1.3.1 (https://pe.usps.com/text/dmm300/223.htm)). This is the actual scale weight, not a dimensional weight calculation.

**Requirement 3: Volume must be within the service limit.**

- **Priority Mail Cubic:** 0.5 cubic feet (864 cubic inches) maximum across five tiers (USPS DMM 223.1.3.1–1.3.2 (https://pe.usps.com/text/dmm300/223.htm)).
- **Ground Advantage Cubic:** 1.0 cubic feet (1,728 cubic inches) maximum across ten tiers (USPS DMM 283.1.3.1–1.3.2 (https://pe.usps.com/text/dmm300/283.htm)).

Volume calculation: (Length × Width × Height) ÷ 1,728 = cubic feet. Per DMM 283.1.3.3 (https://pe.usps.com/text/dmm300/283.htm) and DMM 223.1.3.3 (https://pe.usps.com/text/dmm300/223.htm), round each cubic measurement DOWN to the nearest 0.25 inch before multiplying.

All three requirements must be met simultaneously. A 15 lb package with 0.3 cubic feet volume but a 23 inch longest side: does not qualify. A 10 lb package with 21 inch longest side but 0.6 cubic feet volume: qualifies for Ground Advantage Cubic only, not Priority Mail Cubic.

The USPS Cubic Calculator (https://dimmath.com/usps-cubic-calculator/) checks all three requirements automatically and shows which service Priority Mail Cubic or Ground Advantage Cubic applies to your package.

  <img
    src="https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-1024.webp"
    srcset="https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-1024.webp 1024w, https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-768.webp 768w, https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-640.webp 640w, https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-320.webp 320w"
    sizes="(max-width: 768px) 100vw, 768px"
    alt="DimMath USPS Cubic tier ladder diagram illustrating Tier 0.1 through 1.0 volume step pricing for Ground Advantage and Priority Mail Cubic"
    class="w-full h-auto object-contain"
    loading="lazy"
    width="1024"
    height="572"
  />
  
    USPS Cubic volume tier ladder — packages under 22" and 20 lb bill by volume tier rather than weight

  

## **What Automatically Disqualifies a Package**

Four package types or conditions disqualify a shipment from cubic pricing regardless of dimensions 

### USPS Flat Rate box sizes and 2026 prices

Source: https://dimmath.com/blog/usps-flat-rate-box-sizes-dimensions-costs-when-to-use/ (source post updated 2026-06-22)

USPS Flat Rate boxes ship anything up to 70 lbs anywhere in the US for one fixed price. No zone math. No dimensional weight calculation. No fuel surcharges. No nonstandard fees. The price depends only on which box you use.

That simplicity is the appeal. It is also the trap. Flat Rate boxes are free and the pricing feels predictable which leads sellers to use them on shipments where Ground Advantage or USPS Cubic would cost $5-15 less per package.

This guide covers every current box size, 2026 commercial and retail rates, the two critical fee exemptions most sellers do not know about, and the decision framework for when Flat Rate actually wins.

## **All USPS Flat Rate Box Sizes and 2026 Prices**

All Flat Rate boxes ship via Priority Mail with 1-3 business day delivery, free tracking, and $100 insurance included. Boxes are free — you pay only the postage. Commercial rates are available through Pirate Ship, Shippo, ShipStation, and similar platforms at no extra cost.

**Flat Rate Envelope**  
Dimensions: 12.5 × 9.5 inches (flexible thickness)  
Retail: $11.95 | Commercial: ~$10.30  
Best for: documents, flat accessories, items under 0.5 inches thick

**Small Flat Rate Box**  
Dimensions: 8-11/16 × 5-7/16 × 1-3/4 inches  
Retail: $12.65 | Commercial: ~$11.20  
Best for: jewelry, small electronics, cosmetics, compact dense items

**Medium Flat Rate Box — Top-Loading**  
Dimensions: 11-1/4 × 8-3/4 × 6 inches  
Retail: $24.79 | Commercial: ~$19.60  
Best for: bottles, candles, stacked books, upright items that load vertically

**Medium Flat Rate Box — Side-Loading**  
Dimensions: 14-1/8 × 12 × 3-1/2 inches  
Retail: $24.79 | Commercial: ~$19.60  
Best for: clothing, framed photos, flat art prints, items that lay horizontally

**Large Flat Rate Box**  
Dimensions: 12-1/4 × 12-1/4 × 6 inches  
Retail: $34.02 | Commercial: ~$28.70  
Best for: heavy tools, textbooks, multiple products, dense items over 10 lbs

All boxes support up to 70 lbs maximum weight. The price does not change between a 1 lb package and a 70 lb package in the same box.

**Discontinued:** Regional Rate boxes are no longer available. If you have old Regional Rate packaging, USPS will not honor Regional Rate pricing the shipment gets re-rated as standard weight-and-zone Priority Mail. Any guide still listing Regional Rate boxes is out of date.

## **The Two Medium Box Configurations – Same Price, Different Products**

Both Medium Flat Rate Box configurations cost the same $19.60 commercial, $24.79 retail. But they are built for completely different products and the wrong choice wastes interior space.

**Top-Loading Medium (11-1/4 × 8-3/4 × 6 inches):**  
This box is taller and deeper. It loads from the top. The 6-inch depth makes it ideal for products that stand upright: wine bottles, supplement bottles, candles, rolled posters in tubes, stacked books, or anything that fills vertical space naturally. If your product is 5-6 inches tall and relatively narrow, this is the right Medium.

**Side-Loading Medium (14-1/8 × 12 × 3-1/2 inches):**  
This box is wide and flat. It loads from the side. The 14-inch width makes it the right choice for clothing, soft goods, framed photos, flat art prints, board games that are thin, or any product that lays horizontally. The extra 14 inches of width accommodates items that would never fit in the top-loading version.

The mistake: sellers default to the top-loading Medium because it is what their Post Office stocks. The side-loading Medium ships via mail order from USPS.com (http://USPS.com) and is worth ordering if your products are flat. Packing a flat item into the top-loading box wastes the depth and often requires void fill that adds weight without adding value.

## **Two Fee Exemptions Most Sellers Do Not Know**

Flat Rate packaging has two advantages that never appear in the rate comparison but add real value on specific shipments.

**Exemption 1: DIM weight does not apply.**  
Standard Priority Mail and Ground Advantage apply

### Amazon FBA size tier thresholds

Source: https://dimmath.com/blog/amazon-fba-size-tiers-smalllargeoversize-full-chart/ (source post updated 2026-06-24)

| Size Tier                | Longest Side                    | Median Side    | Shortest Side    | Weight          | Notes                   |
| ------------------------ | ------------------------------- | -------------- | ---------------- | --------------- | ----------------------- |
| Small Standard           | 15 in or under                  | 12 in or under | 0.75 in or under | 16 oz or under  | Lowest fees             |
| Large Standard           | 18 in or under                  | 14 in or under | 8 in or under    | 20 lbs or under | Standard tier           |
| Small Bulky              | 18-37 in                        | 24 in or under | 24 in or under   | 20-50 lbs       | NEW January 15 2026     |
| Large Bulky              | 37-59 in                        | 33 in or under | 33 in or under   | 50-150 lbs      | Formerly Large Oversize |
| Extra-Large under 50 lbs | Over 59 in or girth over 130 in | Any            | Any              | Under 50 lbs    | High fees               |
| Extra-Large 50-70 lbs    | Over 59 in or girth over 130 in | Any            | Any              | 50-70 lbs       | Higher fees             |
| Extra-Large 70-150 lbs   | Over 59 in or girth over 130 in | Any            | Any              | 70-150 lbs      | Highest fees            |
| Extra-Large over 150 lbs | Any                             | Any            | Any              | Over 150 lbs    | Special handling        |

### Amazon FBA fulfilment fees

Source: https://dimmath.com/blog/amazon-fba-fees-explained-complete-breakdown/ (source post updated 2026-06-21)

| Category                  | Referral Fee                |
| ------------------------- | --------------------------- |
| Most categories           | 15%                         |
| Electronics               | 8%                          |
| Computers                 | 8%                          |
| Clothing and accessories  | 17%                         |
| Jewelry                   | 20% on first $250, 5% above |
| Amazon Device Accessories | 45%                         |
| Grocery under $15         | 8%                          |
| Grocery over $15          | 15%                         |

| Size Tier      | Weight       | Fee                          |
| -------------- | ------------ | ---------------------------- |
| Small standard | 2 oz or less | $3.22                        |
| Small standard | 2-4 oz       | $3.31                        |
| Small standard | 4-6 oz       | $3.43                        |
| Small standard | 6-8 oz       | $3.53                        |
| Small standard | 8-10 oz      | $3.65                        |
| Small standard | 10-12 oz     | $3.74                        |
| Small standard | 12-16 oz     | $3.86                        |
| Large standard | 6-10 oz      | $4.27                        |
| Large standard | 10-16 oz     | $4.60                        |
| Large standard | 1-1.5 lb     | $5.04                        |
| Large standard | 1.5-2 lb     | $5.40                        |
| Large standard | 2-2.5 lb     | $5.89                        |
| Large standard | 2.5-3 lb     | $6.27                        |
| Large standard | 3+ lb        | $6.97 + $0.16 per lb above 3 |

| Shipment Split                  | Fee per Unit (Standard) |
| ------------------------------- | ----------------------- |
| Minimal split (1 warehouse)     | $0.27 to $1.30          |
| Partial split (2-3 warehouses)  | $0.21 to $1.00          |
| Optimized split (4+ warehouses) | $0 to $0.49             |

| Fee                                         | Amount  |
| ------------------------------------------- | ------- |
| Referral fee (15%)                          | -$4.50  |
| FBA fulfillment fee (large standard 1.5 lb) | -$5.04  |
| Fuel surcharge (3.5% of $5.04)              | -$0.18  |
| Storage (monthly estimate, standard)        | -$0.15  |
| Inbound placement (minimal split estimate)  | -$0.50  |
| Total Amazon fees                           | -$10.37 |
| Revenue after Amazon fees                   | $19.62  |

### Amazon referral fee percentages by category

Source: https://dimmath.com/blog/fba-referral-fees-by-category-full-table/ (source post updated 2026-06-22)

| Category                           | Referral Fee                            | Notes                       |
| ---------------------------------- | --------------------------------------- | --------------------------- |
| Most categories                    | 15%                                     | Default rate                |
| Electronics                        | 8%                                      | All price points            |
| Computers                          | 8%                                      | All price points            |
| Camera and Photo                   | 8%                                      | All price points            |
| Cell Phones and Accessories        | 8%                                      | Phones only; accessories 8% |
| Consumer Electronics               | 8%                                      | All price points            |
| Video Game Consoles                | 8%                                      | All price points            |
| Personal Computers                 | 6%                                      | Lowest rate on Amazon       |
| Automotive                         | 12%                                     | All price points            |
| Industrial and Scientific          | 12%                                     | All price points            |
| Clothing and Accessories           | 5% under $15, 10% $15-$20, 17% over $20 | Tiered                      |
| Shoes and Handbags                 | 5% under $15, 10% $15-$20, 17% over $20 | Tiered                      |
| Grocery under $15                  | 8%                                      | Price-based tier            |
| Grocery over $15                   | 15%                                     | Price-based tier            |
| Health and Personal Care under $10 | 8%                                      | Price-based tier            |
| Health and Personal Care over $10  | 15%                                     | Price-based tier            |
| Jewelry under $250                 | 20%                                     | Tiered                      |
| Jewelry $250-$1,000                | 15%                                     | Tiered                      |
| Jewelry over $1,000                | 5%                                      | Tiered                      |
| Fine Art under $100                | 20%                                     | Tiered                      |
| Fine Art $100-$1,000               | 15%                                     | Tiered                      |
| Fine Art $1,000-$5,000             | 10%                                     | Tiered                      |
| Fine Art over $5,000               | 5%                                      | Tiered                      |
| Books                              | 15% + $1.80 closing fee                 | Per unit                    |
| Music                              | 15% + $1.80 closing fee                 | Per unit                    |
| DVDs                               | 15% + $1.80 closing fee                 | Per unit                    |
| Video Games                        | 15% + $1.80 closing fee                 | Per unit                    |
| Software                           | 15% + $1.80 closing fee                 | Per unit                    |
| Amazon Device Accessories          | 45%                                     | Highest rate                |
| Gift Cards                         | 20%                                     | All price points            |

### Amazon FBA storage and aged-inventory fees

Source: https://dimmath.com/blog/fba-long-term-storage-fees-how-to-avoid-it/ (source post updated 2026-06-24)

| Days in FBA     | Surcharge Rate                 | Notes                    |
| --------------- | ------------------------------ | ------------------------ |
| Under 181 days  | $0                             | No surcharge             |
| 181 to 270 days | $1.25 per cubic foot per month | Eased from $1.50 in 2025 |
| 271 to 365 days | $5.45 per cubic foot per month | Steep escalation         |
| Over 365 days   | $6.90 per cubic foot per month | Maximum rate             |

| Period          | Days in FBA     | Monthly Storage          | AIS Surcharge            | Total Monthly |
| --------------- | --------------- | ------------------------ | ------------------------ | ------------- |
| Jan to Jun 2026 | 0 to 180 days   | $0.78 × 8 cu ft = $6.24  | $0                       | $6.24         |
| Jul 2026        | 181 to 210 days | $0.78 × 8 cu ft = $6.24  | $1.25 × 8 cu ft = $10.00 | $16.24        |
| Oct 2026        | 271 days        | $2.25 × 8 cu ft = $18.00 | $5.45 × 8 cu ft = $43.60 | $61.60        |
| Jan 2027        | 365 plus days   | $0.78 × 8 cu ft = $6.24  | $6.90 × 8 cu ft = $55.20 | $61.44        |

### Amazon inbound placement fees

Source: https://dimmath.com/blog/fba-inbound-placement-fee-minimal-vs-optimized-split-guide/ (source post updated 2026-07-03)

A seller built a restock of 600 units, clicked the option on the shipment screen that looked simplest, and Amazon quietly added a placement fee to every single unit. He had no idea the fee existed until he checked his invoice.

The FBA inbound placement fee is one of the most misunderstood costs in the FBA fee stack. Most sellers either default to minimal split without calculating the cost or default to optimized split assuming it always wins. Neither default is always correct. The right choice depends on a calculation that takes five minutes and can save hundreds of dollars per shipment.

## **What the Inbound Placement Fee Is and Why It Exists**

When you send inventory to Amazon FBA, Amazon needs to distribute it across multiple fulfillment centers to position stock close to the customers most likely to buy it. Someone needs to pay for that distribution. Amazon gives you a choice about who that is.

**Option 1: You pay Amazon to distribute.**  
Ship all inventory to one or two fulfillment centers. Amazon handles the cross-country redistribution internally. Amazon charges you a per-unit placement fee for doing it.

**Option 2: You distribute yourself.**  
Ship inventory to five or more fulfillment centers as Amazon directs. You handle the logistics of sending multiple shipments to multiple locations. Amazon charges zero placement fee because you did the distribution work.

The placement fee is not a mandatory cost of using FBA. It is a convenience fee for choosing to ship to fewer locations. Most sellers who pay it do not realize they had a choice.

The fee structure updated on January 15, 2026. Large standard items in the 3 to 20 lb range were restructured into new weight bands, making heavier items in this tier disproportionately expensive under minimal split. If your analysis of this fee was done before January 2026 it needs to be rerun.

The fee is charged 45 days after Amazon receives your inventory not at the time the shipment plan is created. It appears as a service fee in your transaction reports. This delay makes it easy to miss on a monthly basis.

## **Minimal Split vs Optimized Split – What Each Costs**

**Minimal Shipment Split:**  
You ship to one or two fulfillment centers. Amazon redistributes internally. Per-unit placement fees apply and vary by size tier and weight.

The fee ranges by size tier as directional guidance from published sources in 2026:  
Small standard: lower end of the fee range  
Large standard: mid-range, higher for heavier weight bands after January 2026 restructuring  
Small and medium oversize (now Small Bulky): higher range  
Large oversize and above (now Large Bulky and Extra-Large): highest range

As directional guidance from published 2026 sources: small standard fees run approximately $0.14 to $0.32 per unit under minimal split. Large standard fees run approximately $0.20 to $1.90 per unit with the highest rates applying to products over 5 lbs after the January 2026 weight band restructuring. Extra-Large products can reach up to $2.30 per unit. Always verify the exact fee in the Send to Amazon workflow before approving any shipment plan.

The actual fee for your specific product and shipment appears in the Send to Amazon workflow in Seller Central before you approve the plan. That is the authoritative number. Use it, not any third-party estimate including this article.

**Amazon-Optimized Shipment Split:**  
You ship to five or more fulfillment centers as Amazon directs. Zero placement fee.

The tradeoff: more shipping destinations means more carrier cost, more operational complexity, and more inbound shipments to track simultaneously.

  <img
    src="https://pagesmith-cdn.com/64019a59/images/a-clean-minimalist-horizontal-5-step-decision-flowchart-diag-0a25f284-1024.webp"
    srcset="https://pagesmith-cdn.com/64019a59/images/a-clean-minimalist-horizontal-5-step-decision-flowchart-diag-0a25f284-320.webp 320w, https://pagesmith-cdn.com/64019a59/images/a-clean-minimalist-horizontal-5-

### Amazon low-inventory-level fee thresholds

Source: https://dimmath.com/blog/fba-low-inventory-level-fee-how-the-fnsku-change-affects-multi-variant-sellers/ (source post updated 2026-07-11)

<img crossorigin="anonymous" src="https://images.pexels.com/photos/38195854/pexels-photo-38195854.jpeg?auto=compress&cs=tinysrgb&w=1200" srcset="https://images.pexels.com/photos/38195854/pexels-photo-38195854.jpeg?auto=compress&cs=tinysrgb&w=320 320w, https://images.pexels.com/photos/38195854/pexels-photo-38195854.jpeg?auto=compress&cs=tinysrgb&w=480 480w, https://images.pexels.com/photos/38195854/pexels-photo-38195854.jpeg?auto=compress&cs=tinysrgb&w=640 640w, https://images.pexels.com/photos/38195854/pexels-photo-38195854.jpeg?auto=compress&cs=tinysrgb&w=768 768w, https://images.pexels.com/photos/38195854/pexels-photo-38195854.jpeg?auto=compress&cs=tinysrgb&w=1024 1024w, https://images.pexels.com/photos/38195854/pexels-photo-38195854.jpeg?auto=compress&cs=tinysrgb&w=1280 1280w, https://images.pexels.com/photos/38195854/pexels-photo-38195854.jpeg?auto=compress&cs=tinysrgb&w=1920 1920w" sizes="(max-width: 768px) 100vw, 1200px" alt="Warehouse rack filled with inventory boxes ready to be restocked" class="w-full h-auto rounded-xl my-8 object-cover max-h-[500px]" loading="lazy" />

A seller with a clothing line has a parent ASIN with ten color and size variants. Nine variants are well stocked. One variant, Blue Small, has three units left. Under the rules before January 2026, the parent ASIN looked healthy overall and the low inventory fee did not trigger. Under the 2026 rules, Blue Small incurs the fee on every single sale until it is restocked above 28 days of supply regardless of how healthy the other nine variants are.

Some sellers are reporting single variants losing 10 percent of their revenue to this fee alone. Most discovered it on their invoice, not before it happened.

This guide explains the change, which sellers it affects most, how to find the variants currently triggering the fee, and the specific actions that stop it.

## **What Changed in January 2026 – Parent ASIN to FNSKU Level**

The Low Inventory Level fee was introduced in April 2024. It charges sellers a per-unit fee when their historical days of supply drops below 28 days, penalizing sellers for running low on stock that Amazon needs to fulfill fast-shipping promises.

Before January 2026 Amazon calculated days of supply at the parent ASIN level. All variants of a product were pooled together. If the combined inventory across all variants represented adequate days of supply, no fee triggered even if individual variants were running low.

Effective January 15, 2026 Amazon shifted the calculation to the FNSKU level. Each individual variant is now assessed independently. A parent ASIN with ten variants where nine are healthy and one is low on stock will have the fee applied to sales of the low-stock variant regardless of the parent's overall inventory health.

The Grocery category is exempt from the FNSKU-level change. All other standard categories apply the new rule.

### **The key threshold most guides miss:**

The fee only applies to FNSKUs that have sold 20 or more units in the past 7 days. Slow-moving variants that have not hit that velocity threshold are not affected even if their stock is critically low. This is important for sellers with large catalogs including slow-moving size or color variants. The fee targets active variants specifically, not dormant ones.

For the complete breakdown of all 2026 FBA fee changes including the fuel surcharge and placement fee restructuring, see Amazon FBA Fees Explained. (https://dimmath.com/blog/amazon-fba-fees-explained-complete-breakdown/)

## **Which Sellers Are Hit Hardest**

The FNSKU-level change disproportionately affects sellers with high variant counts in categories where demand is unevenly distributed across variants.

**Apparel and footwear:** The hardest hit category. A single listing may have 30 or more FNSKUs across sizes and colors. Demand concentrates on popular sizes (Medium, Large) while fringe sizes (XS, 3XL) sell slowly. Under the new rules each fringe size FNSKU that crosses the 20-unit-per-wee

### MPF and HMF rates

Source: https://dimmath.com/blog/mpf-and-hmf-fees-explained-03464-minmax-when-each-applies/ (source post updated 2026-06-23)

| Line Item                      | Amount         |
| ------------------------------ | -------------- |
| Product cost                   | $50,000.00     |
| International ocean freight    | $2,800.00      |
| Marine insurance (0.5%)        | $250.00        |
| Duty (6% of $50,000)           | $3,000.00      |
| MPF (0.3464% of $50,000)       | $173.20        |
| HMF (0.125% of $50,000)        | $62.50         |
| Customs broker fee             | $250.00        |
| Drayage and domestic transport | $400.00        |
| **Total Landed Cost**          | **$56,935.70** |

### De minimis status and effective dates

Source: https://dimmath.com/blog/section-321-de-minimis-800-how-it-works-who-qualifies/ (source post updated 2026-06-23)

Section 321 of the Tariff Act of 1930 allowed any shipment valued at $800 or less to enter the United States duty-free with no formal customs entry, no Merchandise Processing Fee, and no customs bond. For a decade it was the foundation of cross-border e-commerce. In 2025 and 2026 it was systematically dismantled.

Understanding what remains, what changed, and what the cost structure looks like now is essential for any seller importing goods into the US or shipping internationally to US customers.

## **What Section 321 Was and How It Worked**

Section 321 of the Tariff Act of 1930, codified at 19 U.S.C. 1321, is the de minimis provision CBP still describes in its e-commerce FAQs (https://www.cbp.gov/trade/basic-import-export/e-commerce/faqs) as covering merchandise valued at **$800 or less**. Those FAQs (last modified September 2, 2026) also state that the **indefinite suspension** of the de minimis exemption applies to merchandise valued at $800 or less arriving via all modes, including the international postal network, unless specifically excepted.

Under the original provision, a shipment valued at $800 or less per person per day could enter the US under a simplified customs process:

No duties assessed regardless of product category or country of origin.  
No Merchandise Processing Fee (MPF), which is 0.3464 percent of the shipment value on formal entries with a minimum of $33.58 and maximum of $651.50.  
No customs bond required.  
No formal entry summary (CBP Form 7501).  
Clearance based on a carrier manifest, typically within hours of arrival.

The provision applied per person per day. A single recipient could receive one qualifying shipment per day from any origin. Commercial shipments could also qualify, but the $800 applied per shipment.

By 2024, CBP was processing approximately 1.36 billion de minimis shipments per year, roughly 4 million per day. The average shipment value was $54. The provision had grown far beyond its original intent of reducing administrative burden on low-value personal imports and had become the structural backbone of direct-to-consumer cross-border e-commerce from China.

## **What Changed in 2025 and 2026 – The Timeline**

The elimination of de minimis did not happen in one step. It happened in stages across 2025 and 2026.

**May 2, 2025:** De minimis eligibility eliminated for all shipments originating from China and Hong Kong. Postal shipments from China began facing duties of $80 to $200 per item or applicable IEEPA tariff rates, whichever is higher. Express carrier shipments from China began facing full duty assessment.

**August 29, 2025:** Executive Order 14257 expanded the suspension of de minimis treatment to shipments from all countries worldwide. Not just China. All origins.

**July 4, 2025:** The "One Big Beautiful Bill Act" signed into law codified elements of the de minimis restrictions, providing legislative foundation for what had previously been executive action only.

**February 2026:** A White House proclamation confirmed the suspension of de minimis treatment continues indefinitely with no restoration date announced.

The practical result: as of 2026, there is no $800 duty-free threshold for any shipment from any country. Every imported package now faces duty assessment, MPF, and formal or informal entry requirements regardless of value.

Some sources published before August 2025 still describe the de minimis exemption as applying to non-China countries. Those sources reflect the state of the law before August 29, 2025. They are out of date for 2026 shipments.

## **What Shipments Cost Now Without De Minimis**

The cost difference between de minimis treatment and formal entry is significant for low-value packages.

**Example: A $150 consumer goods shipment from Vietnam, Home and Kitchen category, 6% duty rate.**

Under de minimis (pre-2025): $0 duty, $0 MPF, $0 formal entry cost. Total customs cost: $0.

Under 2026 formal entry requirements:  
Duty: $150 × 6% = $9.00  
M

### De minimis suspension (follow-up)

Source: https://dimmath.com/blog/de-minimis-suspended-how-ecommerce-sellers-adapt-and-profit/ (source post updated 2026-09-01)

For over a decade the Section 321 de minimis exemption let packages valued under $800 enter the US duty-free with minimal paperwork. In FY2024 alone 1.36 billion low-value packages cleared US customs under this exemption. That era is over.

On May 2 2025 the exemption was suspended for China and Hong Kong origin parcels. On August 29 2025 it was extended to all countries worldwide. On July 4 2026 the One Big Beautiful Bill Act was signed making the elimination permanent effective July 1 2027. For practical purposes every ecommerce seller importing goods into the US is now operating in a post-de-minimis world.

Every parcel entering the US now requires an HTS code, formal or informal customs entry, and full duty payment regardless of value as confirmed by US Customs and Border Protection (https://www.cbp.gov/trade/basic-import-export/e-commerce/faqs). The $800 threshold that protected small shipments is suspended indefinitely and will be permanently gone by mid-2027. This is not a temporary disruption. It is a structural change to the economics of cross-border ecommerce.

This article explains exactly what changed, who gets hit hardest, and the five adjustments sellers are making to stay profitable.

## **What the De Minimis Suspension Actually Changed**

Before August 29 2025 a package worth $799 entering the US from any country required no formal customs entry, no HTS code, no duty payment, and minimal paperwork. A customs broker was not needed. Processing took 2 to 4 hours. The package moved through customs largely invisibly.

After August 29 2025 that same $799 package requires all of the following regardless of its value or country of origin:

Formal or informal customs entry filed with US Customs and Border Protection.  
A 10-digit HTS (Harmonized Tariff Schedule) code classifying the product type.  
An ISF (Importer Security Filing or 10+2) for ocean shipments.  
Full duty payment at the applicable tariff rate.  
Merchandise Processing Fee of **0.3464 percent** of entered value with a **$33.58** minimum and **$651.50** maximum on formal entries per CBP’s User Fee Table (https://www.cbp.gov/trade/basic-import-export/user-fee-table) — not $32.71 / $634.62. Mail other than inbound EMS is MPF-exempt per the e-commerce FAQs (https://www.cbp.gov/trade/basic-import-export/e-commerce/faqs).  
Customs brokerage fees of approximately $15 to $25 per parcel for the filing itself.

Processing times increased from 2 to 4 hours to 2 to 4 days. The additional time creates inventory and cash flow challenges for sellers dependent on just-in-time replenishment.

CBP duty collection increased 89 percent since the suspension confirming that enforcement is active and consistent. Section 321 filings declined 30 percent as importers restructured their supply chains or abandoned certain product lines entirely.

The suspension is not a soft policy. It is being enforced at scale. For the broader context of how macro-level trade disruptions are affecting import costs in 2026 see How the Strait of Hormuz Crisis Is Raising Your Import Costs (https://dimmath.com/blog/how-the-strait-of-hormuz-crisis-is-raising-your-import-costs/).

## **The New Cost Stack on Every Import – MPF, Duty, and Brokerage**

The financial impact of the de minimis suspension is not just the duty itself. It is the fixed cost stack that now applies to every individual parcel regardless of value.

**The three mandatory new costs:**

Merchandise Processing Fee (MPF): **0.3464 percent** of customs value, **$33.58 min / $651.50 max** on formal entries (CBP User Fee Table (https://www.cbp.gov/trade/basic-import-export/user-fee-table)). Informal entries, when MPF applies, are **$2.69, $8.06, or $12.09**. Older $32.71 / $634.62 figures are not on the current table. Mail other than inbound EMS is MPF-exempt.

Customs duty: varies by product category and country of origin. A 12 percent duty on a $50 product is $6.00. On a $20 product it is $2.40. For China-origin goods additional Section 

### UPS and FedEx additional handling thresholds

Source: https://dimmath.com/blog/ups-and-fedex-additional-handling-surcharge/ (source post updated 2026-07-06)

A seller ships a 48-inch ski. The label says $13. The invoice three weeks later says $78. Nothing changed except the package crossed a size threshold that triggered an Additional Handling Surcharge. The carrier never warned them at label creation. The charge appeared after delivery.

This is one of the most common surprise billing situations in ecommerce shipping in 2026. Two changes made it worse this year. Both UPS and FedEx added cubic volume as a new surcharge trigger. And ceiling rounding introduced in August 2025 means packages with fractional dimensions now measure larger before the cubic calculation runs.

## **Two Surcharges – Additional Handling and Large Package**

UPS and FedEx use two distinct size-based surcharges. They have different thresholds, different costs, and different triggers. Understanding which one applies to your packages is the first step to avoiding surprise invoices.

**Additional Handling Surcharge (AHS):**  
Applied when a package requires manual handling outside the carrier's automated sorting network. Automated systems process standard rectangular boxes within normal size ranges. Packages that fall outside those ranges require human intervention at the facility.

In 2026 both carriers added a new cubic volume trigger to the existing AHS criteria. A package now triggers AHS if any of the following apply:

Longest side exceeds 48 inches.  
Second longest side exceeds 30 inches.  
Actual weight exceeds 50 lbs (US domestic) or 55 lbs (international).  
Cubic volume exceeds 10,368 cubic inches. **New effective January 2026.**  
Package is not fully encased in an outer shipping container.  
Package is encased in an outer shipping container made of metal or wood.

**Large Package Surcharge:**  
Applied when a package exceeds UPS and FedEx's largest standard size criteria. This is a more expensive surcharge than AHS and applies to the largest packages.

Triggers when:  
Cubic volume exceeds 17,280 cubic inches. **New effective January 2026.**  
Weight exceeds 110 lbs.  
Length plus girth exceeds 165 inches at UPS or 157 inches at FedEx.

A package can trigger only one size surcharge per shipment. If it meets both AHS and Large Package criteria, only the Large Package Surcharge applies since it is the higher charge.

  <img
    src="https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-1024.webp"
    srcset="https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-1024.webp 1024w, https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-768.webp 768w, https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-640.webp 640w, https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-320.webp 320w"
    sizes="(max-width: 768px) 100vw, 768px"
    alt="DimMath package measurement diagram showing length, width, height, volume threshold, and the rule that Large Package replaces Additional Handling when both apply"
    class="w-full h-auto object-contain"
    loading="lazy"
    width="1024"
    height="572"
  />
  
    Planning estimate — verify final charges on your carrier invoice.

  

For the complete carrier-by-carrier surcharge reference alongside DIM weight divisors, see DIM Weight by Carrier (https://dimmath.com/blog/dim-weight-divisors-by-carrier-full-table/).

## **The New Cubic Volume Thresholds – What 10,368 and 17,280 Actually Look Like**

The cubic volume thresholds are the most important 2026 change for ecommerce sellers because they catch packages that previously avoided surcharges by staying within the length and girth rules.

**10,368 cubic inches (Additional Handling threshold):**  
This is the volume of a box approximately 22 × 22 × 22 inches. Any combination of length, width, and height that multiplies to more than 10,3

### Carrier zone definitions

Source: https://dimmath.com/blog/shipping-zones-explained-how-zones-work-and-zone-skipping/ (source post updated 2026-06-24)

| Carrier                           | Zone 2 | Zone 8 | Zone Cost Premium  |
| --------------------------------- | ------ | ------ | ------------------ |
| USPS Ground Advantage             | $8.08  | $14.36 | +$6.28 per package |
| UPS Ground + residential          | $17.70 | $25.30 | +$7.60 per package |
| FedEx Home Delivery + residential | $17.53 | $25.11 | +$7.58 per package |
| USPS Cubic Tier 0.3               | $8.10  | $11.60 | +$3.50 per package |

## Calculators

### DIM Weight Calculator

https://dimmath.com/dim-weight-calculator/

Inputs: length, width, height, actual weight, units, carrier. Outputs: DIM weight, billable weight, and side-by-side UPS / FedEx / USPS Ground Advantage / USPS Cubic comparisons.

### Smart Box Finder

https://dimmath.com/box-size-finder/

Inputs: item dimensions and quantities, box library. Outputs: smallest fitting carton and wasted cubic inches.

### Carrier Savings Engine

https://dimmath.com/carrier-savings-engine/

Inputs: weight, zone, package type. Outputs: lowest published commercial rate among USPS, UPS, and FedEx for zones 1–9.

### Amazon FBA Fee Calculator

https://dimmath.com/fba-fee-calculator/

Inputs: product size, weight, category, sell price, COGS. Outputs: size tier, fulfillment fee, storage, referral, and net margin.

### FBA Prep Cost Calculator

https://dimmath.com/fba-prep-calculator/

Inputs: unit count and prep tasks. Outputs: in-house vs 3PL vs Amazon Prep Service cost.

### USPS Cubic Calculator

https://dimmath.com/usps-cubic-calculator/

Inputs: dimensions and weight. Outputs: Ground Advantage Cubic / Priority Mail Cubic eligibility, cubic feet, tier, and commercial rate band.

### Total Landed Cost Calculator

https://dimmath.com/total-landed-cost-calculator/

Inputs: COGS, freight, HTS duty, insurance. Outputs: per-unit landed cost including MPF/HMF.

### HS Code & Duty Estimator

https://dimmath.com/hs-duty-estimator/

Inputs: product description / HTS, origin, destination, value. Outputs: estimated US inbound duty/MPF (goods imported into the US) and destination-labeled VAT/GST; DDU vs DDP notes.

### Shipping Software Comparison

https://dimmath.com/shipping-software/

Inputs: none (reference page). Outputs: comparison of ShipStation, Pirate Ship, Shippo, and EasyShip for ecommerce labels.

## Full guides (10)

# DIM Weight Divisors by Carrier 2026 (Full Table)

https://dimmath.com/blog/dim-weight-divisors-by-carrier-full-table/

Every major carrier calculates dimensional (DIM) weight by multiplying length, width, and height, then dividing by a specified divisor. A lower divisor yields a higher billable weight. Units matter: U.S. parcel formulas below use cubic inches per pound (in³/lb). Metric formulas use cubic centimeters per kilogram (cm³/kg). Do not mix those units in one cell.

This page is an editorial table of published divisors. Executable calculator logic is maintained separately and is not claimed complete by this article.

Sourced from Published Carrier Rate Schedules

*DIM Weight Divisors by Carrier & Service (current as of 6 September 2026)*

| Carrier | Service Level | Domestic divisor (in³/lb) | International divisor | Rounding | Size threshold |
| --- | --- | --- | --- | --- | --- |
| UPS | Ground, Air, 3 Day Select (daily / account commercial) | 139 in³/lb | Not published on this page — no named current UPS Rate and Service Guide section was cited in this audit | Each fractional dimension rounded up before multiplying (1.1 becomes 2). Then L×W×H ÷ 139, DIM rounded up to a whole pound. 2026 UPS Rate & Service Guide, Determine the Weight and Size — PACKAGE — For All Domestic and International Shipments (listed p.19 of the 7 Sep 2026 Daily Rates PDF). | No cubic-inch minimum in that PACKAGE section. Freight, retail/counter, and negotiated-contract DIM are not this rule. |
| UPS | Retail / counter (no account) | Not filled — retail versus daily divisor was not verified against a named current UPS guide section in this audit | Not filled | Not filled | Not filled |
| FedEx | Ground, Home Delivery, Express | 139 in³/lb | 139 in³/lb for U.S., Puerto Rico, and international shipments (FedEx dimensional weight (https://www.fedex.com/en-us/shipping/packaging/what-is-dimensional-weight.html)) | Each dimension rounded up to the next whole inch (FedEx packaging page) | No cubic-inch exemption stated on that FedEx page |
| USPS | Ground Advantage (DMM 283) | 139 in³/lb when volume > 1,728 in³ | Not a Ground Advantage rule — Ground Advantage is a domestic product | Each dimension rounded up to the next whole inch (DMM 283 §§1.4.1–1.4.2 (https://pe.usps.com/text/dmm300/283.htm)) | DIM applies only if L × W × H > 1,728 in³ |
| USPS | Priority Mail (DMM 223) | 139 in³/lb when volume > 1,728 in³ | Priority Mail International is a separate product; this table does not copy a PMI divisor without a cited IMM section | Each dimension rounded up to the next whole inch (DMM 223 §1.4 (https://pe.usps.com/text/dmm300/223.htm)) | DIM applies only if L × W × H > 1,728 in³ |
| DHL Express | Express Worldwide | 139 in³/lb when billed in inches and pounds | 5,000 cm³/kg when billed in centimeters and kilograms | Ceiling to the next whole increment at sort (as described in DHL service materials; confirm the current DHL Express Rate Guide for your contract) | Typically all shipments; confirm contract |

Calculate billable weight with the DIM Weight Calculator (/dim-weight-calculator/). That tool is a separate code path (R02); correcting this article does not by itself repair calculator output.

---

## **UPS and FedEx DIM Divisors**

FedEx publishes a single 139 in³/lb divisor for shipments in the United States, Puerto Rico, and internationally:

```
DIM weight (lb) = (Length × Width × Height in inches) ÷ 139
```

Source: FedEx, What is dimensional weight? (https://www.fedex.com/en-us/shipping/packaging/what-is-dimensional-weight.html) (page states divide by 139 for those lanes). This page does **not** publish a blanket FedEx international 166 row.

UPS Daily package DIM (account commercial) is documented in the 2026 UPS Rate & Service Guide (Daily Rates PDF, updated 7 September 2026) (https://assets.ups.com/adobe/assets/urn:aaid:aem:356d938a-4f0a-4c71-b50e-bdd890f50b47/original/as/daily-rates-us-en.pdf), section **Determine the Weight and Size — PACKAGE — For All Domestic and International Shipments** (listed at page 19): round each fractional dimension up (example 1.1 becomes 2), multiply, divide by **139**, and round DIM weight up to a whole pound. Do not use `ups.com/assets/resources/webcontent/en_US/daily_rates.pdf` as the current 2026 rule; that URL served a 31 March 2025 guide.

Worked fixture **12.1 × 12.1 × 12.1 in**, **3 lb**: billed dimensions **13 × 13 × 13**; volume 2,197 in³; ceil(2197/139) = **16 lb** DIM; billable **16 lb**.

Retail/counter and negotiated-contract DIM stay unfilled unless a named current guide section is cited. Freight is separate from this PACKAGE rule.

Unlike USPS, the FedEx page does not exempt small cubes from DIM. DimMath commercial UPS/FedEx examples likewise apply DIM with no 1,728 in³ floor.

For zone-level comparisons already on the site, see UPS vs FedEx DIM Weight Analysis (/blog/ups-vs-fedex-dim-weight-who-wins-by-zone/) and FedEx vs UPS Ground Rates Comparison (/blog/fedex-vs-ups-dimensional-weight-which-carrier-bills-more/).

---

## **USPS DIM divisor (current): 139 in³/lb above 1,728 in³**

As of this audit on **6 September 2026**, July 12, 2026 is in the past. The applicable current USPS rules are:

1. **Round each dimension up** to the next whole inch before multiplying (DMM 283 §§1.4.1–1.4.2 (https://pe.usps.com/text/dmm300/283.htm) for Ground Advantage; DMM 223 §1.4 (https://pe.usps.com/text/dmm300/223.htm) for Priority Mail).
2. **Apply DIM only when** billed cubic inches **exceed 1,728** (one cubic foot). At or below 1,728 in³, billable weight is actual weight (subject to other USPS rounding).
3. **Divisor 139**: volume in cubic inches ÷ 139, then round up to the next whole pound. Billable weight is the greater of actual weight and that DIM weight.

Do not label USPS 166 as Current. Do not describe Ground Advantage as exempt from DIM.

### **Worked example (current USPS Ground Advantage and Priority Mail)**

Parcel **16 × 12 × 10 in**, actual **4 lb**:

- Dimensions are already whole inches → volume = 1,920 in³.
- 1,920 &gt; 1,728 → DIM applies.
- 1,920 ÷ 139 = 13.81… → **14 lb** DIM.
- Billable = max(4, 14) = **14 lb**.

This is not 4 lb, and it is not 12 lb from a 166 divisor.

Related packaging tactics: How to Reduce DIM Weight (/blog/how-to-reduce-dim-weight-6-packaging-tactics-that-save-real-money/).

---

## **Historical USPS 166 (before July 12, 2026)**

This section is **historical only**. It is not the current USPS rule.

Before the July 12, 2026 Notice 123 / DMM alignment, domestic USPS Priority Mail DIM commonly used **divisor 166** in³/lb above 1,728 in³, and Ground Advantage often billed actual weight only. Those statements must not appear in the current table or in FAQ answers about today’s rates.

For the same 16 × 12 × 10 in / 4 lb parcel under **historical** Priority Mail 166: 1,920 ÷ 166 = 11.57… → 12 lb DIM (historical illustration only).

---

## **DHL Express: in³/lb versus cm³/kg**

When DHL bills in inches and pounds, the divisor used in DimMath copy is **139 in³/lb**. When DHL bills in centimeters and kilograms, the divisor is **5,000 cm³/kg**. Those are two unit systems, not a domestic/international pair of the same formula.

See DHL vs FedEx International Shipping (/blog/dhl-vs-fedex-international-shipping-which-carrier-is-cheaper/) and Dimensional Weight International Divisor Map (/blog/dimensional-weight-international-139-vs-166-vs-5000-divisor-map/).

---

## **Side-by-side: 16 × 12 × 10 in, 4.0 lb (1,920 in³)**

*16 × 12 × 10 in (1,920 in³), 4.0 lb — current rules*

| Carrier / Service | Divisor | DIM calculation | Threshold | Billable weight |
| --- | --- | --- | --- | --- |
| UPS Ground (commercial daily / account) | 139 in³/lb | 1,920 ÷ 139 = 13.81… lb | No 1,728 in³ floor in these examples | 14 lb |
| FedEx Ground | 139 in³/lb | 1,920 ÷ 139 = 13.81… lb | No cubic-inch exemption on the cited FedEx page | 14 lb |
| USPS Ground Advantage (current) | 139 in³/lb | 1,920 ÷ 139 = 13.81… lb | Yes (> 1,728 in³) | 14 lb |
| USPS Priority Mail (current) | 139 in³/lb | 1,920 ÷ 139 = 13.81… lb | Yes (> 1,728 in³) | 14 lb |

Walkthroughs: How to Calculate DIM Weight (/blog/how-to-calculate-dim-weight-complete-guide/) and Dimensional Weight vs Actual Weight (/blog/dimensional-weight-vs-actual-weight-when-each-applies/).

---

## **Frequently Asked Questions**

### What is the UPS DIM divisor?

DimMath uses **139 in³/lb** for UPS commercial daily/account domestic examples. Retail-counter and international UPS divisors are **not filled** on this page because this audit did not cite a named current UPS Rate and Service Guide section for those cells.

### What is the FedEx DIM divisor?

FedEx states divide cubic inches by **139** for shipments in the United States, Puerto Rico, and internationally (FedEx dimensional weight (https://www.fedex.com/en-us/shipping/packaging/what-is-dimensional-weight.html)). This page does not publish a FedEx international 166 divisor.

### What is the USPS DIM divisor?

**Current** (DMM 283 §§1.4.1–1.4.2 and DMM 223 §1.4, in force after July 12, 2026): round each dimension up to a whole inch; if L × W × H &gt; 1,728 in³, divide by **139** and round up to a whole pound; bill the greater of that DIM weight and actual weight. Ground Advantage is **not** exempt. A 16 × 12 × 10 in, 4 lb parcel bills **14 lb**. Historical divisor **166** belongs only in the dated historical section above.

### When did the USPS DIM divisor change?

USPS aligned Ground Advantage and Priority Mail DIM to **139 in³/lb** with ceiling rounding and the 1,728 in³ trigger effective **July 12, 2026**. As of the 6 September 2026 audit, that date is past. This article’s `updatedDate` is 6 September 2026. No last-reviewed stamp is claimed.

---

## **Related Rate Guides & Calculators**

- DIM Weight Calculator (/dim-weight-calculator/) – Multi-carrier billable weight (separate from this article)
- How to Calculate DIM Weight (/blog/how-to-calculate-dim-weight-complete-guide/)
- Dimensional Weight vs Actual Weight (/blog/dimensional-weight-vs-actual-weight-when-each-applies/)
- USPS Cubic vs Ground Advantage (/blog/usps-cubic-vs-ground-advantage-when-cubic-wins/)
- Cheapest Carrier by Zone Comparison Table (/blog/cheapest-carrier-by-zone-zone-2-8-price-comparison-table/)

---

# USPS Ground Advantage Rates 2026 – Zone Chart & Weight Breaks

https://dimmath.com/blog/usps-ground-advantage-rates-zone-chart-weight-breaks/

USPS Ground Advantage commercial parcels price by weight and zone. The tables below are the Notice 123 commercial file effective **July 12, 2026**, section #_c451 (https://pe.usps.com/text/dmm300/Notice123.htm#_c451). Basis: commercial (not retail). Units: US dollars. Every cell is transcribed from that source — none are estimates.

**Effective:** July 12, 2026.

*USPS Ground Advantage commercial parcels — ounce breaks by zone (under 1 lb), effective July 12, 2026*

| Weight | Zone 1 | Zone 2 | Zone 3 | Zone 4 | Zone 5 | Zone 6 | Zone 7 | Zone 8 | Zone 9 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Up to 4 oz | $6.93 | $6.94 | $7.30 | $7.46 | $7.69 | $7.86 | $8.07 | $8.40 | $8.40 |
| Up to 8 oz | $6.93 | $6.94 | $7.30 | $7.46 | $7.69 | $7.86 | $8.07 | $8.40 | $8.40 |
| Up to 12 oz | $6.93 | $6.94 | $7.30 | $7.46 | $7.69 | $7.86 | $8.07 | $8.40 | $8.40 |
| Up to 15.999 oz | $6.93 | $6.94 | $7.30 | $7.46 | $7.69 | $7.86 | $8.07 | $8.40 | $8.40 |

*USPS Ground Advantage commercial parcels — 1–20 lb by zone, effective July 12, 2026*

| Weight | Z1 | Z2 | Z3 | Z4 | Z5 | Z6 | Z7 | Z8 | Z9 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 lb | $7.61 | $7.68 | $8.00 | $8.15 | $8.74 | $9.63 | $9.98 | $10.67 | $10.67 |
| 2 lb | $7.99 | $8.08 | $8.26 | $8.51 | $9.95 | $11.58 | $12.00 | $12.87 | $12.87 |
| 3 lb | $8.64 | $8.66 | $9.14 | $9.67 | $11.57 | $13.59 | $14.36 | $15.75 | $15.75 |
| 4 lb | $9.28 | $9.34 | $9.70 | $10.65 | $12.84 | $15.16 | $16.19 | $18.01 | $18.01 |
| 5 lb | $9.70 | $9.76 | $10.14 | $11.02 | $13.48 | $15.89 | $17.12 | $19.19 | $19.19 |
| 6 lb | $9.87 | $9.94 | $10.36 | $11.55 | $14.28 | $16.89 | $18.31 | $20.68 | $20.68 |
| 7 lb | $9.96 | $10.02 | $10.62 | $11.90 | $14.90 | $17.65 | $19.23 | $21.83 | $21.83 |
| 8 lb | $10.10 | $10.27 | $11.49 | $12.43 | $15.49 | $18.34 | $20.08 | $22.90 | $22.90 |
| 9 lb | $11.01 | $11.25 | $12.39 | $13.65 | $16.11 | $19.13 | $21.01 | $24.09 | $24.09 |
| 10 lb | $11.91 | $12.26 | $13.18 | $14.44 | $16.76 | $19.94 | $21.97 | $25.34 | $25.34 |
| 11 lb | $12.75 | $12.94 | $14.00 | $15.18 | $18.12 | $21.28 | $23.68 | $27.37 | $27.37 |
| 12 lb | $13.49 | $13.85 | $14.63 | $15.89 | $18.86 | $22.20 | $24.78 | $28.73 | $28.73 |
| 13 lb | $14.15 | $14.48 | $15.25 | $16.53 | $19.62 | $23.16 | $25.87 | $30.11 | $30.11 |
| 14 lb | $14.73 | $15.07 | $15.81 | $17.13 | $20.38 | $24.14 | $26.99 | $31.53 | $31.53 |
| 15 lb | $15.23 | $15.53 | $16.31 | $17.67 | $21.15 | $25.13 | $28.11 | $32.91 | $32.91 |
| 16 lb | $15.64 | $15.91 | $16.73 | $17.94 | $21.89 | $26.09 | $29.22 | $34.29 | $34.29 |
| 17 lb | $15.97 | $16.29 | $17.15 | $18.41 | $22.51 | $26.85 | $30.11 | $35.42 | $35.42 |
| 18 lb | $16.21 | $16.46 | $17.61 | $18.94 | $23.16 | $27.70 | $31.09 | $36.64 | $36.64 |
| 19 lb | $16.38 | $16.82 | $17.81 | $19.36 | $23.79 | $28.52 | $32.07 | $37.84 | $37.84 |
| 20 lb | $16.46 | $17.06 | $18.03 | $19.66 | $24.93 | $30.32 | $34.67 | $40.39 | $40.39 |

The same Notice 123 file continues through 70 lb plus an oversized row (length plus girth over 108 inches, not over 130 inches). Calculators use the full 1–70 lb commercial table. Confirm against Postal Explorer Notice 123 (https://pe.usps.com/text/dmm300/Notice123.htm#_c451) before buying labels.

### **How USPS Ground Advantage Pricing Works**

Ground Advantage prices by two variables: weight and zone.

**Weight** determines the base rate tier. Under 1 lb, packages price by ounce tiers. Over 1 lb, packages price by the pound rounded up to the next whole pound.

**Ounce tiers (under 1 lb):**

- Up to 4 oz
- Up to 8 oz
- Up to 12 oz
- Up to 15.999 oz

A package weighing 4.2 oz pays the 8 oz rate. A package weighing 11.5 oz pays the 12 oz rate. Weights round up to the next tier.

**Pound tiers (over 1 lb):**  
Packages over 15.999 oz round up to 1 lb and price by the pound. A package weighing 8.3 lbs pays the 9 lb rate. Maximum weight is 70 lbs.

**Zone** is the distance between origin and destination ZIP code. USPS divides domestic shipments into Zones 1 through 9. Zone 1 is local. Zone 8 is coast-to-coast. Zone 9 covers Alaska, Hawaii, and US territories. The farther the zone, the higher the rate at every weight tier.

Commercial rates are available through shipping platforms including Pirate Ship, Shippo, and ShipStation, not at USPS retail counters. See Notice 123 (https://pe.usps.com/text/dmm300/Notice123.htm) for the official published file.

## **Retail vs Commercial – The Gap You Should Not Be Paying**

USPS charges two rate structures: retail at the Post Office counter and commercial through approved platforms.

Retail Ground Advantage starts at $7.90 for lightweight packages shipped short distances. Commercial rates for the same package start around $5.50 at Zone 1 a $2.40 difference on the lightest packages.

That gap repeats on every label. A seller shipping 30 orders per week at an average $2.15 retail premium over commercial rates is spending $258 extra per month, or over $3,000 per year, simply by walking into the Post Office instead of using a shipping platform.

Commercial rates are available for free through Pirate Ship, Shippo, and ShipStation with no volume minimums and no monthly fees. There is no scenario where paying retail rates makes financial sense for a regular e-commerce seller.

For packages that qualify for USPS Cubic, compare the **same** Notice 123 commercial file: a **3 lb** Ground Advantage commercial **Zone 5** parcel is **$11.57**; Ground Advantage Cubic **tier 0.3 Zone 5** is **$10.96** (Notice 123 (https://pe.usps.com/text/dmm300/Notice123.htm)). A 10×8×6 in box is 480 in³ / 0.278 ft³ → **tier 0.3**. Cubic is **$0.61** lower on that row — not a $9.20 estimate. Use the USPS Cubic Calculator (/usps-cubic-calculator/) for other dimensions.

## **The 2026 Rate Increases – Three Stacked Changes**

Ground Advantage in 2026 absorbed three separate cost increases that together produced approximately 16 percent higher rates year over year.

**January 18, 2026:** Average 7.8 percent increase across Ground Advantage. The largest single-year increase in recent USPS history for this service.

**April 26, 2026:** 8 percent temporary surcharge on Ground Advantage and other competitive products, running through January 17, 2027. Packages under one pound were among the most affected, with some weight-zone combinations seeing 12 percent increases from the surcharge alone.

**July 12, 2026:** Three structural changes took effect on Ground Advantage Commercial:

1. The under-1 lb commercial **price cells** for 4 oz, 8 oz, 12 oz, and 15.999 oz are **the same dollar amounts** in the July 12, 2026 Notice 123 commercial table (for example Zone 1 is $6.93 on all four rows). The named ounce **breaks still exist** in that file; they are not a single 12–15.999 oz row. Do not read “same price” as “tiers deleted from the published table.”
2. Ceiling rounding introduced: all package dimensions round up to the next whole inch before DIM weight is calculated the same rule UPS and FedEx introduced in August 2025.
3. DIM divisor drops from 166 to 139 for packages over 1 cubic foot.

The combined effect of the July 12 changes is approximately 11.8 percent additional increase on Ground Advantage Commercial, on top of the January and April increases already in effect.

## **Who Gets Hit Hardest by the July 12 Changes**

The July 12 changes do not affect all sellers equally. Three profiles absorb disproportionate impact.

**Sellers shipping 4 oz and 8 oz packages.** The tier elimination is the most significant change for lightweight package shippers. A 4 oz package currently pays $5.50 at Zone 1 commercial. After July 12 it pays the 12-15.999 oz rate $6.16 at Zone 1. That is a 12 percent increase on the lightest packages with no change in actual weight or service. Apparel sellers, cosmetics brands, and accessory sellers shipping small items in this weight range will see the highest per-unit cost jump.

**Sellers shipping bulky lightweight packages over 1 cubic foot.** The DIM divisor drop from 166 to 139 for packages over 1,728 cubic inches increases billable weight on every large package where DIM weight applies. A package that calculated to 12 lbs DIM weight at divisor 166 now calculates to 14 lbs at divisor 139. Two extra billable pounds on every such shipment.

**Sellers using standard Ground Advantage for packages that qualify for cubic.** The July 12 changes do not affect USPS Cubic pricing. Packages eligible for cubic longest side 22 inches or under, 20 lbs or under, 0.5 cubic feet or under for Priority Mail Cubic or 1.0 cubic feet for Ground Advantage Cubic pay flat tier rates that bypass the DIM divisor and ounce tier changes entirely.

If your packages qualify for cubic pricing, switching to cubic pricing now protects against both the tier elimination and the DIM divisor change. The full comparison of when cubic beats standard Ground Advantage by zone and weight is in USPS Cubic vs Ground Advantage (https://dimmath.com/blog/usps-cubic-vs-ground-advantage-when-cubic-wins/).

## **Action Checklist for the July 12, 2026 Changes**

**Step 1: Identify your 4 oz and 8 oz shipments.** Pull your last 30 days of Ground Advantage labels and count how many fall in the 4 oz and 8 oz tiers. Those packages will see an immediate rate increase on July 12 with no other change. Recalculate your per-unit shipping cost at the 12 oz rate to see the margin impact.

**Step 2: Check cubic eligibility on sub-1-lb packages.** Packed longest side 22 inches or under (DMM 283.1.3.1 (https://pe.usps.com/text/dmm300/283.htm) / 223.1.3.1 (https://pe.usps.com/text/dmm300/223.htm)), 20 lb or under, and volume within the cubic service cap. Eligibility does not mean cubic is cheaper than the ounce-break commercial row.

**Step 3: Re-measure your boxes over 1 cubic foot.** Since July 12, USPS applies ceiling rounding before DIM weight calculation — the same as UPS and FedEx since August 2025. Measure your exterior dimensions, round each UP to the next whole inch, and recalculate DIM weight using the 139 divisor. If the new DIM weight changes your billable weight tier, model the cost impact.

**Step 4: Compare Ground Advantage vs UPS and FedEx after July 12.** The USPS advantage on bulky packages narrows after the divisor change. For packages over 1 cubic foot shipping to Zone 5 and above, run a fresh carrier comparison. The DIM Weight Calculator (https://dimmath.com/dim-weight-calculator/) shows all four carriers simultaneously with zone-based pricing and USPS Cubic eligibility checked automatically.

**Step 5: Submit accurate dimensions on every label.** The July 12 changes also introduce a $3.00 noncompliance fee for packages over 1 cubic foot or 22 inches in length where dimensions are missing or incorrect. Ensure your shipping platform submits dimensions on every Ground Advantage commercial label.

For the full carrier comparison including when USPS Ground Advantage beats UPS and FedEx by zone and weight, see see Cheapest Way to Ship Small Packages (https://dimmath.com/blog/cheapest-way-to-ship-small-packages-usps-vs-ups-vs-fedex/).

Commercial cells above are from Notice 123, effective July 12, 2026. That is the price-file effective date, not a DimMath review stamp. See changelog (https://dimmath.com/changelog/).

## **FAQ**

### Did USPS Ground Advantage rates go up in 2026?

Yes. This page’s source table is the commercial schedule effective April 26, 2026. The article also records an average 7.8 percent increase on January 18, 2026, an 8 percent temporary surcharge on April 26, 2026 (through January 17, 2027), and structural Ground Advantage Commercial changes on July 12, 2026. Confirm the live file on USPS Postal Explorer Notice 123 (https://pe.usps.com/text/dmm300/Notice123.htm).

### What are the USPS Ground Advantage weight breaks?

Under 1 lb, commercial Ground Advantage uses ounce tiers: up to 4 oz, 8 oz, 12 oz, and 15.999 oz, with weight rounding up to the next tier. Over 1 lb, packages round up to the next whole pound through 70 lb. The zone-by-zone prices for those breaks are in the tables at the top of this page.

### How many zones does USPS use?

USPS prices domestic Ground Advantage across Zones 1 through 9. Zone 1 is local. Zone 8 is typically coast-to-coast. Zone 9 covers Alaska, Hawaii, and U.S. territories. The charts on this page show Zones 1–8, which cover the bulk of lower-48 e-commerce volume.

### When did the 2026 USPS rate change take effect?

The commercial Ground Advantage rates in these tables took effect April 26, 2026. Earlier in the year, January 18, 2026 brought the average 7.8 percent increase. July 12, 2026 added the ounce-tier consolidation, ceiling rounding, and DIM divisor change described above.

---

# USPS Cubic Tier Pricing – Full Rate Table

https://dimmath.com/blog/usps-cubic-tier-pricing-full-rate-table/

USPS Cubic pricing assigns a flat rate based on your package's cubic volume tier and shipping zone. Once your package qualifies, weight does not affect the rate a 2 lb item and an 18 lb item in the same tier pay the same postage.

The tier system has two versions: Priority Mail Cubic with 5 tiers up to 0.5 cubic feet, and Ground Advantage Cubic with 10 tiers up to 1.0 cubic feet. Most rate tables published online show only Priority Mail. This article covers both.

## **How Cubic Tiers Work – Two Rules Most Sellers Get Wrong**

Before the rate table, two rules that affect which tier your package lands in.

**Rule 1: Measure DOWN, round to nearest 0.25 inch.**  
When calculating cubic volume for USPS purposes, round each dimension DOWN to the nearest quarter inch before running the formula. A dimension of 11.9 inches is measured as 11.75 inches. A dimension of 8.3 inches is measured as 8.25 inches. This is the opposite of UPS and FedEx ceiling rounding.

Cubic Feet = (Length × Width × Height) ÷ 1,728

Always use the rounded-down dimensions in that formula.

**Rule 2: Tier rounds UP to the next tier.**  
Once you have your cubic volume, the tier is determined by rounding UP to the next tier boundary. A package calculating to 0.21 cubic feet falls into the 0.3 tier not the 0.2 tier. A package at exactly 0.20 cubic feet falls into the 0.2 tier.

The tier boundaries are:

- Tier 0.1: up to and including 0.10 cubic feet
- Tier 0.2: over 0.10 up to and including 0.20 cubic feet
- Tier 0.3: over 0.20 up to and including 0.30 cubic feet
- Tier 0.4: over 0.30 up to and including 0.40 cubic feet
- Tier 0.5: over 0.40 up to and including 0.50 cubic feet

Ground Advantage Cubic adds tiers 0.6 through 1.0 using the same boundary logic.

## **Priority Mail Cubic Rate Table – 5 Tiers by Zone**

Priority Mail Cubic delivers in 1-3 business days. Maximum volume 0.5 cubic feet. Maximum longest side 22 inches. Maximum weight 20 lbs.

**Commercial rates** from USPS Notice 123 (https://pe.usps.com/text/dmm300/Notice123.htm), effective July 12, 2026:

| Tier | Volume       | Zone 1 | Zone 2 | Zone 3 | Zone 4 | Zone 5 | Zone 6 | Zone 7 | Zone 8 | Zone 9 |
| ---- | ------------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ |
| 0.1  | ≤ 0.10 cu ft | $9.06  | $9.34  | $9.73  | $10.50 | $13.02 | $14.69 | $15.39 | $15.51 | $33.09 |
| 0.2  | ≤ 0.20 cu ft | $9.10  | $9.39  | $9.78  | $10.79 | $13.17 | $15.34 | $16.31 | $16.37 | $34.94 |
| 0.3  | ≤ 0.30 cu ft | $9.45  | $9.71  | $10.75 | $12.68 | $16.56 | $18.86 | $20.51 | $20.57 | $43.91 |
| 0.4  | ≤ 0.40 cu ft | $11.06 | $11.29 | $12.63 | $15.12 | $20.23 | $24.88 | $27.25 | $27.30 | $58.28 |
| 0.5  | ≤ 0.50 cu ft | $11.59 | $11.70 | $13.23 | $16.10 | $22.31 | $27.27 | $30.24 | $30.56 | $65.23 |

These are published commercial prices, not retail and not interpolated. See changelog (https://dimmath.com/changelog/).

**Box dimensions that hit each Priority Mail Cubic tier:**

| Tier | Example Box    | Cubic Inches | Cubic Feet |
| ---- | -------------- | ------------ | ---------- |
| 0.1  | 6 × 5 × 5 in   | 150          | 0.087      |
| 0.2  | 8 × 6 × 6 in   | 288          | 0.167      |
| 0.3  | 9 × 7 × 6 in   | 378          | 0.219      |
| 0.4  | 10 × 8 × 8 in  | 640          | 0.370      |
| 0.5  | 12 × 10 × 6 in | 720          | 0.417      |

These are examples. Any combination of dimensions producing the same cubic volume lands in the same tier. The USPS Cubic Calculator (https://dimmath.com/usps-cubic-calculator/) calculates your exact tier from your dimensions.

## **Ground Advantage Cubic Rate Table – 10 Tiers by Zone**

Ground Advantage Cubic delivers in 2-5 business days. Maximum volume 1.0 cubic feet. Maximum longest side 22 inches. Maximum weight 20 lbs.

**Commercial rates** from USPS Notice 123 (https://pe.usps.com/text/dmm300/Notice123.htm), effective July 12, 2026:

| Tier | Volume       | Zone 1 | Zone 2 | Zone 3 | Zone 4 | Zone 5 | Zone 6 | Zone 7 | Zone 8 | Zone 9 |
| ---- | ------------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ |
| 0.1  | ≤ 0.10 cu ft | $7.45  | $7.51  | $7.83  | $7.99  | $8.49  | $9.21  | $9.53  | $10.13 | $10.13 |
| 0.2  | ≤ 0.20 cu ft | $7.82  | $7.89  | $8.14  | $8.34  | $9.37  | $10.66 | $11.05 | $11.84 | $11.84 |
| 0.3  | ≤ 0.30 cu ft | $8.39  | $8.45  | $8.81  | $9.23  | $10.96 | $12.83 | $13.48 | $14.67 | $14.67 |
| 0.4  | ≤ 0.40 cu ft | $9.07  | $9.13  | $9.51  | $10.34 | $12.43 | $14.66 | $15.61 | $17.29 | $17.29 |
| 0.5  | ≤ 0.50 cu ft | $9.59  | $9.66  | $10.03 | $10.93 | $13.32 | $15.70 | $16.89 | $18.90 | $18.90 |
| 0.6  | ≤ 0.60 cu ft | $9.84  | $9.90  | $10.31 | $11.43 | $14.10 | $16.68 | $18.05 | $20.36 | $20.36 |
| 0.7  | ≤ 0.70 cu ft | $9.94  | $10.00 | $10.56 | $11.82 | $14.76 | $17.47 | $19.02 | $21.57 | $21.57 |
| 0.8  | ≤ 0.80 cu ft | $10.08 | $10.23 | $11.34 | $12.34 | $15.39 | $18.22 | $19.94 | $22.71 | $22.71 |
| 0.9  | ≤ 0.90 cu ft | $10.84 | $11.08 | $12.24 | $13.44 | $16.01 | $18.99 | $20.84 | $23.89 | $23.89 |
| 1.0  | ≤ 1.00 cu ft | $12.02 | $12.34 | $13.28 | $14.54 | $16.93 | $20.11 | $22.18 | $25.60 | $25.60 |

Zone 8 and Zone 9 are identical in this Ground Advantage Cubic table, matching the published Notice 123 cells.

Ground Advantage Cubic is cheaper than Priority Mail Cubic at the same zone on Zones 1–8 in this table. The tradeoff is 2-5 day delivery versus 1-3 day delivery. Zone 9 Priority Mail Cubic is a separate published cell and is not estimated from Zone 8.

## **Tier Breakpoint Optimization – Where One Dimension Change Saves Real Money**

Because tiers round UP, a package at 0.21 cubic feet pays the 0.3 tier rate. Reducing dimensions so the package calculates to 0.20 cubic feet drops it to the 0.2 tier.

At Zone 5 Ground Advantage Cubic: 0.3 tier = $10.96 vs 0.2 tier = $9.37. Save $1.59 per shipment. At 500 orders per month: $795 per month from one dimension change.

**How to find your breakpoints:**

Step 1: Calculate your current cubic volume using rounded-down dimensions.  
Step 2: Check where your result sits within the tier. If you are at 0.22 cubic feet, you are paying the 0.3 rate but only need to get to 0.20 to drop a tier.  
Step 3: Calculate what dimension reduction gets you below the tier boundary.  
Step 4: Check whether a packaging change is feasible for your product.

Example: a 9 × 7 × 6 inch box calculates to (8.75 × 7.0 × 6.0) ÷ 1,728 = 0.213 cubic feet after rounding down. Pays the 0.3 tier. Reduce height by 0.25 inches to 5.75 inches: (8.75 × 7.0 × 5.75) ÷ 1,728 = 0.204 cubic feet. Still in 0.3 tier. Reduce to 5.5 inches: (8.75 × 7.0 × 5.5) ÷ 1,728 = 0.195 cubic feet. Now in 0.2 tier. Save $1.59 per shipment at Zone 5 Ground Advantage Cubic.

For comparison against UPS and FedEx on the same dimensions, the DIM Weight Calculator (https://dimmath.com/dim-weight-calculator/) shows all four carriers side by side with USPS Cubic eligibility checked automatically.

## **Softpack and Padded Envelope Tiers**

Poly mailers, padded envelopes, and soft pack packaging use a different tier calculation. Instead of length × width × height, soft packs are measured by the sum of length plus width of the flat unloaded packaging material.

**Priority Mail Cubic Softpack tiers:**

- Tier 0.1: length + width up to 21 inches
- Tier 0.2: length + width over 21 up to 27 inches
- Tier 0.3: length + width over 27 up to 31 inches
- Tier 0.4: length + width over 31 up to 34 inches
- Tier 0.5: length + width over 34 up to 36 inches

No single dimension can exceed 22 inches (DMM 223.1.3.1 (https://pe.usps.com/text/dmm300/223.htm) / DMM 223.1.3.4 (https://pe.usps.com/text/dmm300/223.htm) for Priority Mail Cubic soft packs; Ground Advantage Cubic soft packs: DMM 283.1.3.4 (https://pe.usps.com/text/dmm300/283.htm)). Combined length plus width cannot exceed 36 inches.

The rates for softpack tiers are the same as the box tiers at the same tier level. A Priority Mail Cubic Softpack in tier 0.2 pays the same Zone 5 rate as a box in tier 0.2.

Ground Advantage Cubic has different soft pack tier thresholds from Priority Mail. Check current USPS Postal Explorer for Ground Advantage soft pack tier dimensions before purchasing labels on padded envelopes.

The full comparison of when USPS Cubic beats Ground Advantage standard rates across zones and weights is in USPS Cubic vs Ground Advantage. (https://dimmath.com/blog/usps-cubic-vs-ground-advantage-when-cubic-wins/) For the matching weight-based commercial prices, use the USPS Ground Advantage 2026 zone chart (/blog/usps-ground-advantage-rates-zone-chart-weight-breaks/).

See changelog (https://dimmath.com/changelog/).

## **FAQ**

### How many tiers does USPS Cubic pricing have?
Priority Mail Cubic has 5 tiers from 0.1 to 0.5 cubic feet. Ground Advantage Cubic has 10 tiers from 0.1 to 1.0 cubic feet. Both services use the same tier boundaries: each tier covers a 0.1 cubic foot range, and packages round UP to the next tier if they exceed the tier boundary.

### How do I calculate which USPS Cubic tier my package falls into?
Measure each dimension and round DOWN to the nearest 0.25 inch. Multiply length × width × height and divide by 1,728. The result in cubic feet determines your tier. If the result exceeds a tier boundary (for example 0.21 cubic feet exceeds 0.20), you round UP to the next tier (0.3). Use the USPS Cubic Calculator (https://dimmath.com/usps-cubic-calculator/) to calculate your tier automatically.

### What is the cheapest USPS Cubic tier and what size box fits in it?
Tier 0.1 is the cheapest, covering packages up to 0.10 cubic feet. A 6 × 5 × 5 inch box calculates to approximately 0.087 cubic feet and fits in tier 0.1. At Zone 5 Ground Advantage Cubic, tier 0.1 is $8.49. At Zone 5 Priority Mail Cubic, $13.02. Any package under 0.10 cubic feet with longest side 22 inches or under and weight 20 lbs or under qualifies.

### What is the difference between Priority Mail Cubic and Ground Advantage Cubic rates?
Ground Advantage Cubic is cheaper per tier than Priority Mail Cubic at the same zone on Zones 1–8 in the July 12, 2026 commercial table. The tradeoff is delivery speed: Priority Mail delivers in 1-3 business days, Ground Advantage delivers in 2-5 business days. Ground Advantage Cubic also allows larger packages — up to 1.0 cubic foot versus 0.5 cubic feet for Priority Mail Cubic.

---

# How to Qualify for USPS Cubic: Rules & Limits

https://dimmath.com/blog/how-to-qualify-for-usps-cubic-22-inch-max-20-lb-max/

USPS Cubic pricing bypasses weight-based rates entirely for eligible packages. The savings are real $3 to $15 per shipment depending on weight and zone. But the eligibility rules are specific, and one dimension over the limit disqualifies the entire shipment.

This is the complete eligibility checklist, how to access cubic rates without a high-volume USPS contract, and what the July 12, 2026 compliance change means for sellers who ship commercially.

## **The Three Eligibility Requirements**

Every package must meet all three to qualify for USPS Cubic pricing. Failing any one of them disqualifies the package regardless of the other two.

**Requirement 1: Longest side must be 22 inches or under.**  
Measure the exterior of the packed, sealed package. Under USPS DMM 283.1.3.1 (https://pe.usps.com/text/dmm300/283.htm) for Ground Advantage and DMM 223.1.3.1 (https://pe.usps.com/text/dmm300/223.htm) for Priority Mail (effective July 12, 2026), the longest single dimension (length, width, or height, whichever is greatest) cannot exceed 22 inches. A box measuring 22.1 inches on any side does not qualify.

This is the most common disqualifier. Sellers with products that are 20–22 inches long often assume they qualify and discover at the label stage that one dimension is 22.2 inches.

**Requirement 2: Weight must be 20 lbs or under.**  
The fully packed scale weight including product, packaging, void fill, and tape must be 20 lbs or under (per DMM 283.1.3.1 (https://pe.usps.com/text/dmm300/283.htm) and DMM 223.1.3.1 (https://pe.usps.com/text/dmm300/223.htm)). This is the actual scale weight, not a dimensional weight calculation.

**Requirement 3: Volume must be within the service limit.**

- **Priority Mail Cubic:** 0.5 cubic feet (864 cubic inches) maximum across five tiers (USPS DMM 223.1.3.1–1.3.2 (https://pe.usps.com/text/dmm300/223.htm)).
- **Ground Advantage Cubic:** 1.0 cubic feet (1,728 cubic inches) maximum across ten tiers (USPS DMM 283.1.3.1–1.3.2 (https://pe.usps.com/text/dmm300/283.htm)).

Volume calculation: (Length × Width × Height) ÷ 1,728 = cubic feet. Per DMM 283.1.3.3 (https://pe.usps.com/text/dmm300/283.htm) and DMM 223.1.3.3 (https://pe.usps.com/text/dmm300/223.htm), round each cubic measurement DOWN to the nearest 0.25 inch before multiplying.

All three requirements must be met simultaneously. A 15 lb package with 0.3 cubic feet volume but a 23 inch longest side: does not qualify. A 10 lb package with 21 inch longest side but 0.6 cubic feet volume: qualifies for Ground Advantage Cubic only, not Priority Mail Cubic.

The USPS Cubic Calculator (https://dimmath.com/usps-cubic-calculator/) checks all three requirements automatically and shows which service Priority Mail Cubic or Ground Advantage Cubic applies to your package.

  <img
    src="https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-1024.webp"
    srcset="https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-1024.webp 1024w, https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-768.webp 768w, https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-640.webp 640w, https://pagesmith-cdn.com/64019a59/images/a-clean-modern-educational-diagram-illustrating-the-usps-cub-c094ac29-320.webp 320w"
    sizes="(max-width: 768px) 100vw, 768px"
    alt="DimMath USPS Cubic tier ladder diagram illustrating Tier 0.1 through 1.0 volume step pricing for Ground Advantage and Priority Mail Cubic"
    class="w-full h-auto object-contain"
    loading="lazy"
    width="1024"
    height="572"
  />
  
    USPS Cubic volume tier ladder — packages under 22" and 20 lb bill by volume tier rather than weight

  

## **What Automatically Disqualifies a Package**

Four package types or conditions disqualify a shipment from cubic pricing regardless of dimensions and weight.

**Rolls and tubes.** USPS explicitly excludes rolls and tubes from cubic pricing per DMM 283.1.3.1 (https://pe.usps.com/text/dmm300/283.htm) and DMM 223.1.3.1 (https://pe.usps.com/text/dmm300/223.htm). Cylindrical packages, poster tubes, and mailing tubes are not eligible regardless of their dimensions or weight.

**Retail counter pricing.** Cubic pricing is a commercial rate. It is not available at the USPS Post Office counter. If you walk in and pay retail rates, cubic pricing does not apply. The rate structure only activates through commercial rate access.

**Flat Rate packaging.** If you use official USPS Flat Rate boxes or envelopes, those shipments are billed at Flat Rate prices, not cubic prices. You cannot apply cubic pricing to Flat Rate packaging.

**Volume over the service limit.** A package calculating to 0.51 cubic feet does not qualify for Priority Mail Cubic. It may qualify for Ground Advantage Cubic if it is under 1.0 cubic feet. A package over 1.0 cubic feet qualifies for neither and reverts to weight-based pricing. The DIM Weight Calculator (https://dimmath.com/dim-weight-calculator/) shows what the package would cost at UPS, FedEx, and USPS standard rates when cubic does not apply.

## **How to Access Cubic Rates Without a 50,000 Package Contract**

Direct USPS cubic pricing contracts have historically required shipping 50,000 or more packages per year. Most small and mid-size e-commerce sellers do not hit that threshold.

The workaround: shipping platforms that aggregate volume across their entire customer base and pass cubic rates through to individual sellers.

**Pirate Ship:** Free to use. No monthly fees. Access to below-commercial cubic rates from the first shipment. Automatically rate-shops between cubic and weight-based rates and shows the cheaper option. No volume minimum.

**Shippo:** Access to cubic rates through their platform. Aggregated volume means any seller can access cubic pricing regardless of their own shipment count.

**ShipStation:** Supports cubic rates. Automatically evaluates whether cubic or weight-based pricing is cheaper for each shipment.

**Stamps.com:** Offers cubic rates, though direct corporate accounts historically maintained high-volume annual thresholds.

The practical implication: if you are not already using Pirate Ship, Shippo, or ShipStation, you may be paying weight-based rates on packages that would qualify for cubic pricing and save $3-$10 per shipment. The access barrier was eliminated for most sellers years ago. The awareness gap is what remains.

## **The July 12, 2026 Dimension Compliance Rule**

Effective July 12, 2026, USPS established explicit dimension noncompliance standards under DMM 283.1.8 (https://pe.usps.com/text/dmm300/283.htm). 

Under the published commercial fee schedule in USPS Notice 123 (https://pe.usps.com/text/dmm300/Notice123.htm) and DMM 283.1.8, a $3.00 Dimension Noncompliance Fee applies when commercial parcels exceeding 1 cubic foot (1,728 cubic inches) or with a length exceeding 22 inches are submitted without dimensions or with inaccurate dimensions.

DMM 283.1.8 outlines an interim implementation structure (Phase One) focusing compliance on parcels meeting these volume or length thresholds, with Phase Two expanding comprehensive verification.

For cubic pricing specifically, accurate measurement is critical:
1. Submitting inaccurate dimensions that overstate cubic eligibility risks assessment of the $3.00 noncompliance fee and correction to weight-based rates.
2. While Phase One specifically targets parcels over 1 cubic foot or longer than 22 inches, Phase Two expands data validation across manifests.

The correct practice: measure the exterior of every packed box, round down to the nearest 0.25 inch for cubic volume evaluation (DMM 283.1.3.3 (https://pe.usps.com/text/dmm300/283.htm)), and manifest exact package dimensions.

## **Packaging Tips to Stay Under 22 Inches**

The 22 inch limit on the longest side is the eligibility threshold most sellers are closest to failing. These packaging decisions specifically target staying under it.

**Use machinable box sizes.** Standard corrugated box sizes are designed around shipping constraints. Common sizes like 18 × 12 × 6, 20 × 12 × 8, and 16 × 12 × 8 all have longest sides under 22 inches and qualify. Avoid custom or non-standard boxes that may creep above 22 inches on one dimension.

**Measure after packing, not before.** A box that measures 21.8 inches empty may measure 22.2 inches when the product inside pushes against the walls. Measure the sealed exterior of the packed box, not the empty box dimensions printed on the flap.

**Switch to a different box orientation.** If a product is 21 × 12 × 5 inches, that 21 inch dimension is the longest side and qualifies. But if the same product is oriented differently in a 23 × 10 × 5 box, the 23 inch side disqualifies it. Sometimes reorienting the product inside a different box shape brings the longest dimension under 22 inches without changing the product or the total volume.

**Consider poly mailers for soft goods.** For apparel, fabric items, and soft goods, flat poly mailers and padded bags can qualify for cubic softpack pricing under DMM 283.1.3.4 (https://pe.usps.com/text/dmm300/283.htm) and DMM 223.1.3.4 (https://pe.usps.com/text/dmm300/223.htm). Under these standards:
- Length plus width of the flat, unloaded mailer cannot exceed 36 inches.
- Neither length nor width may exceed 22 inches.
- Pleated or expandable bags must be measured using standard rectangular parcel measurement rules (DMM 283.1.3.3 (https://pe.usps.com/text/dmm300/283.htm)).
The softpack tier rules and rates are detailed in USPS Cubic Tier Pricing (https://dimmath.com/blog/usps-cubic-tier-pricing-full-rate-table/).

## **Step-by-Step Eligibility Check**

Run this check on every package before printing a cubic label.

**Step 1:** Measure the sealed exterior of the packed box. Record length, width, and height. Round each DOWN to the nearest 0.25 inch.

**Step 2:** Identify the longest dimension. Is it 22 inches or under? If no: package does not qualify for cubic. Check weight-based rates instead.

**Step 3:** Weigh the sealed package. Is it 20 lbs or under? If no: package does not qualify for cubic.

**Step 4:** Calculate cubic volume: (Length × Width × Height) ÷ 1,728. Is the result 0.5 cubic feet or under? If yes: qualifies for Priority Mail Cubic. Is it 0.51 to 1.0 cubic feet? Qualifies for Ground Advantage Cubic only. Over 1.0 cubic feet: does not qualify for cubic pricing.

**Step 5:** Confirm commercial rate access. Are you using Pirate Ship, Shippo, ShipStation, or another platform with cubic rate access? If not, cubic pricing is not available regardless of package eligibility.

**Step 6:** Compare cubic rate to standard weight-based rate. Cubic does not always win. The USPS Cubic Calculator (https://dimmath.com/usps-cubic-calculator/) shows both rates and highlights the cheaper option automatically.

For a full comparison of when cubic beats standard Ground Advantage rates by zone and weight, see USPS Cubic vs Ground Advantage. (https://dimmath.com/blog/usps-cubic-vs-ground-advantage-when-cubic-wins/) Compare those cubic quotes against the USPS Ground Advantage 2026 zone chart (/blog/usps-ground-advantage-rates-zone-chart-weight-breaks/).

Rates verified June 19, 2026. See changelog (https://dimmath.com/changelog/).

## **FAQ**

Q: What are the eligibility requirements for USPS Cubic pricing?  
A: Three requirements must all be met: longest side 22 inches or under, weight 20 lbs or under, and volume within the service limit (0.5 cubic feet for Priority Mail Cubic, 1.0 cubic feet for Ground Advantage Cubic). Rolls and tubes are excluded. Flat Rate packaging is excluded. Commercial rate access is required cubic pricing is not available at USPS retail counters.

Q: Do I need to ship 50,000 packages per year to access USPS Cubic rates?  
A: No, not through shipping platforms. Direct USPS cubic contracts have historically required 50,000 packages per year. Platforms like Pirate Ship and Shippo aggregate volume across all their sellers and pass cubic rates through to any seller from the first shipment with no volume minimum and no monthly fees.

Q: What disqualifies a package from USPS Cubic pricing?  
A: Any single dimension exceeding 22 inches, weight over 20 lbs, volume over 0.5 cubic feet for Priority Mail Cubic or 1.0 cubic feet for Ground Advantage Cubic, roll or tube packaging, use of USPS Flat Rate packaging, or using retail counter pricing rather than commercial rates. All five conditions must be clear for a package to qualify.

Q: What is the July 12 2026 USPS dimension compliance rule?  
A: Effective July 12, 2026, USPS requires accurate dimensions on all commercial manifested parcels. A $3.00 noncompliance fee applies to parcels over 1 cubic foot or 22 inches in length where dimensions are missing or incorrect. For sellers claiming cubic rates, submitting accurate dimensions is essential to maintain eligibility and avoid fees. Always measure the sealed exterior, round down to the nearest 0.25 inch, and submit exact dimensions on every label.

---

# USPS Flat Rate Box Sizes 2026: Dimensions & Prices

https://dimmath.com/blog/usps-flat-rate-box-sizes-dimensions-costs-when-to-use/

USPS Flat Rate boxes ship anything up to 70 lbs anywhere in the US for one fixed price. No zone math. No dimensional weight calculation. No fuel surcharges. No nonstandard fees. The price depends only on which box you use.

That simplicity is the appeal. It is also the trap. Flat Rate boxes are free and the pricing feels predictable which leads sellers to use them on shipments where Ground Advantage or USPS Cubic would cost $5-15 less per package.

This guide covers every current box size, 2026 commercial and retail rates, the two critical fee exemptions most sellers do not know about, and the decision framework for when Flat Rate actually wins.

## **All USPS Flat Rate Box Sizes and 2026 Prices**

All Flat Rate boxes ship via Priority Mail with 1-3 business day delivery, free tracking, and $100 insurance included. Boxes are free — you pay only the postage. Commercial rates are available through Pirate Ship, Shippo, ShipStation, and similar platforms at no extra cost.

**Flat Rate Envelope**  
Dimensions: 12.5 × 9.5 inches (flexible thickness)  
Retail: $11.95 | Commercial: ~$10.30  
Best for: documents, flat accessories, items under 0.5 inches thick

**Small Flat Rate Box**  
Dimensions: 8-11/16 × 5-7/16 × 1-3/4 inches  
Retail: $12.65 | Commercial: ~$11.20  
Best for: jewelry, small electronics, cosmetics, compact dense items

**Medium Flat Rate Box — Top-Loading**  
Dimensions: 11-1/4 × 8-3/4 × 6 inches  
Retail: $24.79 | Commercial: ~$19.60  
Best for: bottles, candles, stacked books, upright items that load vertically

**Medium Flat Rate Box — Side-Loading**  
Dimensions: 14-1/8 × 12 × 3-1/2 inches  
Retail: $24.79 | Commercial: ~$19.60  
Best for: clothing, framed photos, flat art prints, items that lay horizontally

**Large Flat Rate Box**  
Dimensions: 12-1/4 × 12-1/4 × 6 inches  
Retail: $34.02 | Commercial: ~$28.70  
Best for: heavy tools, textbooks, multiple products, dense items over 10 lbs

All boxes support up to 70 lbs maximum weight. The price does not change between a 1 lb package and a 70 lb package in the same box.

**Discontinued:** Regional Rate boxes are no longer available. If you have old Regional Rate packaging, USPS will not honor Regional Rate pricing the shipment gets re-rated as standard weight-and-zone Priority Mail. Any guide still listing Regional Rate boxes is out of date.

## **The Two Medium Box Configurations – Same Price, Different Products**

Both Medium Flat Rate Box configurations cost the same $19.60 commercial, $24.79 retail. But they are built for completely different products and the wrong choice wastes interior space.

**Top-Loading Medium (11-1/4 × 8-3/4 × 6 inches):**  
This box is taller and deeper. It loads from the top. The 6-inch depth makes it ideal for products that stand upright: wine bottles, supplement bottles, candles, rolled posters in tubes, stacked books, or anything that fills vertical space naturally. If your product is 5-6 inches tall and relatively narrow, this is the right Medium.

**Side-Loading Medium (14-1/8 × 12 × 3-1/2 inches):**  
This box is wide and flat. It loads from the side. The 14-inch width makes it the right choice for clothing, soft goods, framed photos, flat art prints, board games that are thin, or any product that lays horizontally. The extra 14 inches of width accommodates items that would never fit in the top-loading version.

The mistake: sellers default to the top-loading Medium because it is what their Post Office stocks. The side-loading Medium ships via mail order from USPS.com (http://USPS.com) and is worth ordering if your products are flat. Packing a flat item into the top-loading box wastes the depth and often requires void fill that adds weight without adding value.

## **Two Fee Exemptions Most Sellers Do Not Know**

Flat Rate packaging has two advantages that never appear in the rate comparison but add real value on specific shipments.

**Exemption 1: DIM weight does not apply.**  
Standard Priority Mail and Ground Advantage apply DIM weight to packages over 1,728 cubic inches. Flat Rate packaging is completely exempt. A large lightweight item that would trigger DIM weight in your own box a bulky foam product, large pillow, light but oversized gift — ships at the flat rate regardless of its dimensional weight calculation.

UPS and FedEx have no equivalent exemption. A large lightweight package at UPS or FedEx gets billed at DIM weight regardless of how light it is. USPS Flat Rate eliminates that calculation entirely.

**Exemption 2: Nonstandard surcharges do not apply.**  
USPS charges nonstandard surcharges of $4.50 to $21.00 for packages that are unusually long, large in volume, or awkwardly shaped. Flat Rate packaging is explicitly exempt from all nonstandard fees. A product that would trigger a $4.50 nonstandard surcharge in your own box ships at the flat rate with no surcharge.

Combined, these exemptions can add $5-20 of hidden savings on shipments that would trigger both DIM weight and nonstandard fees in standard packaging. Run the comparison before assuming Flat Rate is more expensive than your own box.

## **When Flat Rate Wins – The Zone and Weight Breakpoints**

Flat Rate does not win on every shipment. It wins when a specific combination of weight, zone, and package density makes the fixed price cheaper than weight-based alternatives.

**Flat Rate wins when:**

Package is heavy relative to the box size. Flat Rate is priced by the box, not the weight. A 15 lb item in a Medium Flat Rate Box costs $19.60 commercial. The same 15 lb item shipped via Ground Advantage at Zone 5 costs approximately $25+. Flat Rate saves $5-6 per shipment.

Destination is Zone 6, 7, or 8. Flat Rate is zone-independent the same price coast to coast. Weight-based rates climb steeply at long distances. A 10 lb package at Zone 8 via USPS Ground Advantage costs approximately $25. The same package in a Large Flat Rate Box costs $28.70 only $3.70 more with 1-3 day delivery versus 2-5 day. At 8 lbs, the Large Flat Rate Box beats Ground Advantage at Zone 8.

**Approximate weight breakpoints where Large Flat Rate Box beats Ground Advantage (Zone 5-8):**

- Zone 5: break-even around 12-13 lbs
- Zone 6: break-even around 10-11 lbs
- Zone 7: break-even around 9-10 lbs
- Zone 8: break-even around 8-9 lbs

Below those weights, Ground Advantage is cheaper. Above them, Flat Rate wins.

## **When Flat Rate Loses – Three Situations to Avoid**

**Situation 1: Lightweight packages at short zones.**  
A 2 lb item in a Medium Flat Rate Box costs $19.60 commercial. The same item via Ground Advantage at Zone 3 costs approximately $8.26. Flat Rate costs $11.34 more on a lightweight short-distance shipment. This is the most common Flat Rate mistake using a free box because it is convenient, not because it is cheap.

**Situation 2: Small dense packages that qualify for USPS Cubic.**  
If your product fits in a box with longest side 22 inches or under, weight under 20 lbs, and volume within cubic caps (0.5 ft³ Priority Mail or 1.0 ft³ Ground Advantage), USPS Cubic pricing likely beats Flat Rate. A 10 lb item in a 10×8×6 inch box qualifies for Ground Advantage Cubic Tier 0.3 at approximately $9.20 at Zone 5 — versus $19.60 for a Medium Flat Rate Box. USPS Cubic saves $10.40 per shipment on that package. The USPS Cubic Calculator (https://dimmath.com/usps-cubic-calculator/) checks eligibility and shows the cubic rate alongside Flat Rate for direct comparison.

For a full breakdown of when USPS Cubic beats Flat Rate and Ground Advantage by zone and weight, see USPS Cubic vs Ground Advantage. (https://dimmath.com/blog/usps-cubic-vs-ground-advantage-when-cubic-wins/)

**Situation 3: Products that do not fill the box.**  
Flat Rate charges by the box size regardless of how much of it you use. A product filling 30 percent of a Large Flat Rate Box pays the same as a product filling 100 percent. If your product is small enough to fit in a cheaper box, use the cheaper box. The free packaging is not an incentive to upsize.

## **How to Get Flat Rate Boxes and Commercial Rates**

Flat Rate boxes are free from USPS. Two years to get them:

**Online:** Order from usps.com/store. USPS ships them to your door at no cost. The side-loading Medium box is typically only available online Post Office locations often stock only the top-loading Medium.

**Post Office:** Most locations stock envelopes, Small, top-loading Medium, and Large. Supply varies by location.

Commercial rates approximately 10-26 percent below retail are available through any USPS-approved shipping platform. Pirate Ship and Shippo offer commercial rates with no monthly fees and no volume minimums. ShipStation and Stamps.com (http://Stamps.com) also offer commercial access.

The retail-to-commercial gap on Medium Flat Rate runs approximately $5 per box $24.79 retail versus $19.60 commercial. At 100 shipments per month in Medium Flat Rate boxes, the retail premium costs $500 per month versus buying labels through a free commercial platform.

For the full comparison of Flat Rate versus Ground Advantage and USPS Cubic by zone, see Cheapest Way to Ship Small Packages (https://dimmath.com/blog/cheapest-way-to-ship-small-packages-usps-vs-ups-vs-fedex/). For current Ground Advantage commercial rates by zone and weight, see the USPS Ground Advantage 2026 zone chart (https://dimmath.com/blog/usps-ground-advantage-rates-zone-chart-weight-breaks/).

Rates verified June 19, 2026. See changelog (https://dimmath.com/changelog/).

## **FAQ**

Q: What are the USPS Flat Rate box sizes and prices in 2026?  
A: USPS offers four main Flat Rate options. Flat Rate Envelope: $10.30 commercial. Small Flat Rate Box (8-11/16 × 5-7/16 × 1-3/4 inches): $11.20 commercial. Medium Flat Rate Box in two configurations top-loading (11-1/4 × 8-3/4 × 6 inches) and side-loading (14-1/8 × 12 × 3-1/2 inches) both $19.60 commercial. Large Flat Rate Box (12-1/4 × 12-1/4 × 6 inches): $28.70 commercial. All ship via Priority Mail in 1-3 days with free tracking and $100 insurance. Boxes are free from USPS.

Q: Is USPS Flat Rate exempt from dimensional weight pricing?  
A: Yes. Flat Rate packaging is completely exempt from USPS dimensional weight pricing. DIM weight does not apply to Flat Rate shipments regardless of package size. Flat Rate is also exempt from USPS nonstandard surcharges of $4.50-$21.00 that apply to irregularly sized packages in standard packaging.

Q: When does USPS Flat Rate beat Ground Advantage?  
A: Flat Rate beats Ground Advantage for heavy packages shipping to Zone 6, 7, or 8. For the Large Flat Rate Box at Zone 8, the break-even point is approximately 8-9 lbs above that weight, Flat Rate is cheaper than Ground Advantage. For Zone 5, break-even is around 12-13 lbs. For lightweight packages or short zones, Ground Advantage is typically cheaper.

Q: When does USPS Cubic beat USPS Flat Rate?  
A: USPS Cubic beats Flat Rate for small dense packages that qualify for cubic pricing: longest side 22 inches or under, 20 lbs or under, and 0.5 cubic feet or under for Priority Mail Cubic or 1.0 cubic feet for Ground Advantage Cubic. A 10 lb item qualifying for Ground Advantage Cubic Tier 0.3 costs approximately $9.20 at Zone 5 versus $19.60 for a Medium Flat Rate Box $10.40 savings per shipment. Use the USPS Cubic Calculator (https://dimmath.com/usps-cubic-calculator/) to check eligibility.

---

# Amazon Size Tiers – Small, Large, Oversize Full Chart

https://dimmath.com/blog/amazon-fba-size-tiers-smalllargeoversize-full-chart/

Your FBA fulfillment fee is determined before your product is picked, packed, or shipped. It is determined the moment Amazon classifies your product into a size tier based on its packaged dimensions and weight. Get the tier wrong and you pay the wrong fee on every unit sold until someone catches the error.

In 2026 Amazon reorganized the oversize tier structure. The new Small Bulky tier introduced January 15, 2026 changed the fee landscape for a significant portion of FBA sellers. This is the complete 2026 size tier reference.

## **Full Size Tier Chart 2026**

Amazon classifies every FBA product into one of six size tiers. The tier is based on the packaged unit dimensions and weight as recorded in Seller Central, not the product alone and not the inbound carton.

| Size Tier                | Longest Side                    | Median Side    | Shortest Side    | Weight          | Notes                   |
| ------------------------ | ------------------------------- | -------------- | ---------------- | --------------- | ----------------------- |
| Small Standard           | 15 in or under                  | 12 in or under | 0.75 in or under | 16 oz or under  | Lowest fees             |
| Large Standard           | 18 in or under                  | 14 in or under | 8 in or under    | 20 lbs or under | Standard tier           |
| Small Bulky              | 18-37 in                        | 24 in or under | 24 in or under   | 20-50 lbs       | NEW January 15 2026     |
| Large Bulky              | 37-59 in                        | 33 in or under | 33 in or under   | 50-150 lbs      | Formerly Large Oversize |
| Extra-Large under 50 lbs | Over 59 in or girth over 130 in | Any            | Any              | Under 50 lbs    | High fees               |
| Extra-Large 50-70 lbs    | Over 59 in or girth over 130 in | Any            | Any              | 50-70 lbs       | Higher fees             |
| Extra-Large 70-150 lbs   | Over 59 in or girth over 130 in | Any            | Any              | 70-150 lbs      | Highest fees            |
| Extra-Large over 150 lbs | Any                             | Any            | Any              | Over 150 lbs    | Special handling        |

**Critical note on measurement:** Amazon uses the packaged unit dimensions recorded in Seller Central, not the inbound carton. If your Seller Central catalog dimensions are wrong, your tier is wrong and your fee is wrong on every unit sold.

## **The New Small Bulky Tier – What Changed January 15, 2026**

  <img
    src="https://pagesmith-cdn.com/64019a59/images/fba-size-tier-full-chart-2026-1024.webp"
    srcset="https://pagesmith-cdn.com/64019a59/images/fba-size-tier-full-chart-2026-320.webp 320w, https://pagesmith-cdn.com/64019a59/images/fba-size-tier-full-chart-2026-640.webp 640w, https://pagesmith-cdn.com/64019a59/images/fba-size-tier-full-chart-2026-768.webp 768w, https://pagesmith-cdn.com/64019a59/images/fba-size-tier-full-chart-2026-1024.webp 1024w, https://pagesmith-cdn.com/64019a59/images/fba-size-tier-full-chart-2026-1536.webp 1536w"
    sizes="(max-width: 768px) 100vw, 768px"
    alt="DimMath Amazon FBA size-tier diagram showing standard, bulky, and extra-large dimension and weight thresholds."
    class="article-diagram-image mx-auto w-full h-auto rounded-xl border border-slate-200 bg-white"
    width="1536"
    height="864"
    loading="lazy"
  />
  
    Planning estimate — verify final Amazon size tier classification in Seller Central.
  

Before January 15, 2026, products with a longest side between 18 and 37 inches or weight between 20 and 50 lbs fell into Large Oversize. That tier carried significantly higher fulfillment fees than standard tiers.

Amazon introduced Small Bulky on January 15, 2026 as a new tier between Large Standard and Large Bulky. Products previously paying Large Oversize rates now qualify for Small Bulky at materially lower fees.

**Fee comparison: Small Bulky vs old Large Oversize at 10 lbs:**  
Old Large Oversize: approximately $9.61 per unit  
New Small Bulky: approximately $7.55 per unit  
Saving: $2.06 per unit

At 500 units per month that is $1,030 per month in fee reduction from the tier restructure alone, with no change to the product or packaging.

The reclassification to Small Bulky was automatic on January 15, 2026 for eligible products. But automatic reclassification depends on Amazon's scan data matching your Seller Central catalog dimensions. If your catalog dimensions were incorrect or not updated, the reclassification may not have applied.

Check your current tier in the Fee Preview report in Seller Central. Any product with a longest side between 18 and 37 inches and weight between 20 and 50 lbs should now show Small Bulky. If it still shows Large Bulky or Large Oversize, submit a catalog dimension correction to trigger the reclassification.

## **How DIM Weight Determines Your Size Tier**

Most sellers assume size tier is determined by actual product weight. It is not. Size tier is determined by the greater of actual weight or dimensional weight, the same billable weight concept that applies to outbound consumer shipments.

**DIM weight formula for FBA tier determination:**  
DIM Weight = (Length × Width × Height) ÷ 139

If DIM weight exceeds actual weight, DIM weight determines the tier. A product weighing 2 lbs in a 12 × 10 × 8 inch package calculates to (12 × 10 × 8) ÷ 139 = 6.9 lbs DIM weight. Amazon bills at 6.9 lbs and classifies the unit into the large standard tier based on that DIM weight, even though the product itself weighs 2 lbs.

This creates a specific risk for lightweight products in oversized retail packaging. A product that measures within small standard dimensions but has a DIM weight above 16 oz moves to large standard. The dimension threshold and the weight threshold must both be met to qualify for small standard.

The FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) enters your dimensions and actual weight and automatically determines which size tier applies, whether DIM weight or actual weight is the billing basis, and what the fulfillment fee is at the correct tier.

## **Price Bands – How Selling Price Affects the Fee Within Each Tier**

Within each size tier, the fulfillment fee varies by selling price. Amazon uses three price bands in 2026.

**Low Price FBA: under $10**  
Products priced under $10 qualify for Low Price FBA rates, which are approximately $0.86 per unit lower than the standard $10-50 band. A small standard product under 2 oz priced at $8.99 pays approximately $2.79 per unit versus $3.65 at the standard rate.

**Standard band: $10 to $50**  
The baseline fee table. Most FBA products fall here. All fee tables in this guide reference the $10-50 band unless otherwise noted.

**Above $50 band: over $50**  
Products priced above $50 pay higher fulfillment fees than the $10-50 band. Small standard products above $50 pay approximately $0.51 more per unit. Large standard products above $50 pay approximately $0.31 more per unit.

The $50 price threshold creates a specific pricing decision for products near that boundary. A product priced at $50.01 pays more in fulfillment fees than the same product at $49.99. Model the fee impact at both price points before setting or adjusting price on any product near the $50 threshold.

For the complete fee table by tier and price band, see Amazon FBA Fees Explained 2026 (https://dimmath.com/blog/amazon-fba-fees-explained-complete-breakdown/).

## **Tier Boundary Optimization – The Fee Difference Between Adjacent Tiers**

The fee difference between adjacent tiers is significant enough to justify packaging changes that bring a product from one tier into the next cheaper tier.

**Small standard vs large standard fee difference:**  
A product at 12-16 oz in small standard: approximately $4.30 per unit  
Same product at 10-16 oz in large standard: approximately $5.18 per unit  
Difference: $0.88 per unit. At 1,000 units per month: $880 per month.

**Large standard vs small bulky fee difference:**  
A 10 lb product in large standard top weight band: approximately $7.68 per unit  
Same 10 lb product in small bulky: approximately $7.55 per unit  
Difference: $0.13 per unit at this weight. Larger at heavier weights.

**How to optimize for tier boundaries:**

Step 1: Pull your current size tier from the Fee Preview report in Seller Central for your top 20 SKUs.

Step 2: For each SKU near a tier boundary, identify which dimension or weight is causing the tier assignment.

Step 3: Calculate the fee saving if that dimension or weight dropped below the boundary. Multiply by monthly unit volume.

Step 4: Evaluate whether packaging redesign can bring the dimension below the boundary. Even 0.1 inches on the dimension that is pushing the tier can be worth pursuing at volume.

Step 5: Model the revised fee in the FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) before committing to new packaging. The GO/NO-GO output shows whether the packaging change improves margin enough to justify the investment.

For the detailed comparison of small standard versus large standard thresholds and fees, see FBA Small Standard vs Large Standard. (https://dimmath.com/blog/fba-small-standard-vs-large-standard-size-tier-thresholds/)

## **How Amazon Corrects Tier Misclassification – And What It Costs**

Amazon uses automated 3D scan tunnels at fulfillment centers to measure every product received. If the scanned dimensions produce a different size tier than what is recorded in your Seller Central catalog, Amazon updates the catalog and re-tiers the product.

Re-tiering is automatic and immediate. The new tier fee applies to every unit sold from the moment the correction is made. If your product moves from small standard to large standard due to a scan correction, the $0.88 per unit fee increase applies retroactively from the correction date and going forward.

Common causes of scan corrections:

Recording nominal packaging dimensions instead of actual packed product dimensions. A box printed as 14 × 10 × 8 may measure 14.3 × 10.2 × 8.1 inches when packed. Amazon scans the actual packed dimensions. The fractional excess pushes the recorded dimensions up.

Not accounting for packaging elements that add to measured dimensions: hang tags, protruding labels, handle loops, or packaging features that extend beyond the main body of the product.

Incorrect weight recorded in catalog. Amazon weighs each product at receiving. If your catalog weight is lower than the actual scanned weight and that difference crosses a tier boundary, the product re-tiers to the heavier and more expensive classification.

The defense: measure the actual packed retail unit in its final form, including all packaging elements. Record those exact dimensions and weight in Seller Central. Compare your catalog entry against the physical product before each new shipment is created. Any gap between catalog and reality is a tier correction waiting to happen.

Rates verified June 19, 2026. See changelog (https://dimmath.com/changelog/).

## **FAQ**

Q: What are the Amazon FBA size tiers in 2026?  
A: Amazon uses eight size classifications in 2026. Small Standard: longest side 15 inches or under, weight 16 oz or under. Large Standard: longest side 18 inches or under, weight 20 lbs or under. Small Bulky (new January 15, 2026): longest side 18-37 inches or weight 20-50 lbs. Large Bulky: longest side 37-59 inches or weight 50-150 lbs. Extra-Large tiers: longest side over 59 inches or girth over 130 inches, split into sub-tiers by weight. The tier determines the FBA fulfillment fee per unit.

Q: What is the new FBA Small Bulky tier in 2026?  
A: Amazon introduced the Small Bulky tier on January 15, 2026 for products with a longest side between 18 and 37 inches or weight between 20 and 50 lbs. These products previously fell into Large Oversize and paid significantly higher fees. A 10 lb Small Bulky product now pays approximately $7.55 per unit versus $9.61 under the old Large Oversize rate. The reclassification was automatic for eligible products with accurate catalog dimensions in Seller Central.

Q: How does dimensional weight affect my FBA size tier?  
A: Amazon determines size tier using the greater of actual weight or dimensional weight. DIM weight equals Length × Width × Height ÷ 139. A 2 lb product in a 12 × 10 × 8 inch package calculates to 6.9 lbs DIM weight. Amazon tiers and bills that product at 6.9 lbs, not 2 lbs. Lightweight products in oversized retail packaging are particularly vulnerable to DIM weight tier misclassification. Use the FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) to check which weight determines your tier and fee.

Q: What happens if Amazon scans my product at a different size than my catalog shows?  
A: Amazon's 3D scan tunnels measure every product at receiving. If scanned dimensions produce a different size tier than your Seller Central catalog, Amazon updates the catalog and applies the new tier fee immediately to all future sales. If your product moves from small standard to large standard, you pay approximately $0.88 more per unit from that point forward. Prevent this by recording actual packed retail unit dimensions in Seller Central, not nominal box dimensions. Measure the physical product in its final form including all packaging elements.

---

# Amazon FBA Fees 2026: Every Fee, With Real Numbers

https://dimmath.com/blog/amazon-fba-fees-explained-complete-breakdown/

Most FBA sellers calculate two fees: referral and fulfillment. They miss the other five. By the time inbound placement, storage, fuel surcharge, low inventory penalties, and returns processing are included, total Amazon fees consume 30 to 45 percent of selling price on most products before a single dollar of advertising spend.

This is the complete breakdown of every FBA fee in 2026, what changed in January and April, and what the full cost looks like on a real product.

## **What Changed in 2026 – Two Fee Increases, Not One**

Most sellers heard about the January 2026 FBA fee increase. Fewer planned for the April one.

**January 15, 2026:** Amazon raised FBA fulfillment fees by an average of $0.08 per unit. Standard-size products saw increases of $0.04 to $0.18 per unit depending on size tier. Products priced above $50 saw a disproportionate average increase of $0.31 per unit. Amazon noted this was the first increase since 2024, following no changes in 2025.

**April 17, 2026:** Amazon introduced a 3.5% fuel surcharge applied to FBA fulfillment fees. This is a percentage on top of the fulfillment fee, not a flat amount. A product with a $4.75 fulfillment fee now pays an additional $0.17 in fuel surcharge per unit.

The two increases stack. A product that paid $4.57 in fulfillment fees in 2025 now pays $4.75 base plus $0.17 fuel surcharge — $4.92 total. That is an 8 percent effective increase on fulfillment alone before any other fee changes are counted.

## **Referral Fees – The Percentage You Pay on Every Sale**

Amazon charges a referral fee on every unit sold. It is calculated as a percentage of the total sale price including any shipping charges collected from the buyer.

Most categories charge 15 percent. Some charge less. A few charge more.

| Category                  | Referral Fee                |
| ------------------------- | --------------------------- |
| Most categories           | 15%                         |
| Electronics               | 8%                          |
| Computers                 | 8%                          |
| Clothing and accessories  | 17%                         |
| Jewelry                   | 20% on first $250, 5% above |
| Amazon Device Accessories | 45%                         |
| Grocery under $15         | 8%                          |
| Grocery over $15          | 15%                         |

The referral fee is deducted from your payout before you receive it. It does not appear as a separate line item on your bank statement. Many sellers see the net deposit and never calculate what percentage went to Amazon as commission.

Referral fees did not increase in 2026. They remain unchanged from 2025.

## **FBA Fulfillment Fees – What Amazon Charges to Pick, Pack, and Ship**

  <img
    src="https://pagesmith-cdn.com/64019a59/images/dimmath-fba-fee-stack-where-25-goes-1024.webp"
    srcset="https://pagesmith-cdn.com/64019a59/images/dimmath-fba-fee-stack-where-25-goes-320.webp 320w, https://pagesmith-cdn.com/64019a59/images/dimmath-fba-fee-stack-where-25-goes-640.webp 640w, https://pagesmith-cdn.com/64019a59/images/dimmath-fba-fee-stack-where-25-goes-768.webp 768w, https://pagesmith-cdn.com/64019a59/images/dimmath-fba-fee-stack-where-25-goes-1024.webp 1024w, https://pagesmith-cdn.com/64019a59/images/dimmath-fba-fee-stack-where-25-goes-1536.webp 1536w"
    sizes="(max-width: 768px) 100vw, 768px"
    alt="DimMath Amazon FBA fee-stack diagram showing referral fee, fulfillment fee, storage, placement, COGS, and net margin."
    class="article-diagram-image mx-auto w-full h-auto rounded-xl border border-slate-200 bg-white"
    width="1536"
    height="864"
    loading="lazy"
  />
  
    Planning estimate — verify final Amazon fees in Seller Central.
  

The fulfillment fee covers picking, packing, and shipping each unit. It does not cover storage, inbound shipping, returns, or advertising.

Fees are based on size tier and weight. Amazon uses the greater of actual weight or dimensional weight for most size tiers. Enter your product dimensions and weight into the FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) to see the exact fulfillment fee for your product before committing inventory.

**2026 fulfillment fees (non-peak, excluding fuel surcharge):**

| Size Tier      | Weight       | Fee                          |
| -------------- | ------------ | ---------------------------- |
| Small standard | 2 oz or less | $3.22                        |
| Small standard | 2-4 oz       | $3.31                        |
| Small standard | 4-6 oz       | $3.43                        |
| Small standard | 6-8 oz       | $3.53                        |
| Small standard | 8-10 oz      | $3.65                        |
| Small standard | 10-12 oz     | $3.74                        |
| Small standard | 12-16 oz     | $3.86                        |
| Large standard | 6-10 oz      | $4.27                        |
| Large standard | 10-16 oz     | $4.60                        |
| Large standard | 1-1.5 lb     | $5.04                        |
| Large standard | 1.5-2 lb     | $5.40                        |
| Large standard | 2-2.5 lb     | $5.89                        |
| Large standard | 2.5-3 lb     | $6.27                        |
| Large standard | 3+ lb        | $6.97 + $0.16 per lb above 3 |

Add 3.5% fuel surcharge to all of the above effective April 17, 2026.

Apparel products pay an additional $0.40 per unit surcharge on top of the standard fulfillment fee.

### **April 17, 2026 Update: Fuel and Logistics Surcharge**

Effective April 17, 2026 Amazon added a 3.5% fuel and logistics surcharge on all FBA fulfillment fees in the US and Canada. The surcharge also applies to Remote Fulfillment with FBA shipping from the US into Canada, Mexico, and Brazil. Buy with Prime and Multi-Channel Fulfillment were included from May 2, 2026.

The surcharge is calculated on the fulfillment fee only, not on the sale price or any other fee category. It does not apply to referral fees, storage fees, inbound placement fees, or any other Amazon charge.

Average per-unit impact: approximately $0.17 for standard-size items. The exact amount depends on your size tier and fulfillment fee. A product with a $5.00 fulfillment fee pays $0.18 in fuel surcharge.

Amazon described the surcharge as temporary but provided no end date. The 2022 fuel surcharge was also described as temporary before being rolled into permanent base fees. Plan for this surcharge to remain in place through at least the end of 2026.

**Price tier impact:** Products priced above $50 saw higher average fee increases in 2026 than lower-priced products. If you sell a product priced just below $50, review whether a price increase above $50 would still maintain margin after the additional fee impact.

## **Storage Fees – The Cost of Inventory Sitting in Amazon's Warehouses**

Amazon charges monthly storage fees based on the average daily cubic feet your inventory occupies.

**Standard-size storage:**  
January through September: $0.78 per cubic foot per month  
October through December: $2.40 per cubic foot per month

Q4 storage is roughly three times the off-peak rate. Inventory that sits unsold in October, November, and December costs significantly more per cubic foot than the same inventory in July.

**Long-term storage:**  
Inventory stored over 181 days: surcharge applies  
Inventory stored over 365 days: $6.90 per cubic foot or $0.15 per unit, whichever is greater

The practical implication: sending excess inventory to FBA for Q4 and failing to sell through creates a compounding cost. You pay 3x storage rates on units you are also paying long-term fees on.

Pull inventory that has not sold in 180 days before October 1 each year. The removal cost is almost always less than the long-term storage fee.

## **Inbound Placement Fees – The Hidden Cost Most Sellers Overlook**

Amazon introduced inbound placement fees in 2024 and expanded them in 2026. This fee covers Amazon's cost of distributing your inventory across multiple fulfillment centers.

The fee depends on how many fulfillment centers you ship to when sending inventory inbound.

| Shipment Split                  | Fee per Unit (Standard) |
| ------------------------------- | ----------------------- |
| Minimal split (1 warehouse)     | $0.27 to $1.30          |
| Partial split (2-3 warehouses)  | $0.21 to $1.00          |
| Optimized split (4+ warehouses) | $0 to $0.49             |

Most sellers default to minimal split because it is operationally simpler. That convenience costs $0.27 to $1.30 per unit on every inbound shipment. At 1,000 units per month, that is $270 to $1,300 per month in placement fees alone.

The FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) includes inbound shipping and placement in the full P&L so you see the true cost per unit before sending inventory.

Sellers who use a 3PL to pre-distribute inventory to multiple Amazon fulfillment centers can qualify for optimized split rates and reduce or eliminate placement fees. The 3PL cost needs to be compared against the placement fee savings on a per-unit basis.

## **Other Fees Sellers Frequently Miss**

**Fuel surcharge (April 17, 2026):** 3.5% of the FBA fulfillment fee on every unit. Already covered above but worth listing separately because it does not appear on most fee estimators that have not been updated since April.

**Low inventory level fee:** Charged when your historical days of supply on a SKU falls below 28 days. The fee is calculated as a percentage of the FBA fulfillment fee and applies to every unit sold until you restock above the threshold. Sellers who run lean inventory to minimize storage fees can inadvertently trigger this fee.

**Returns processing fee:** For categories where Amazon offers free returns to buyers, Amazon charges the seller a returns processing fee equal to the fulfillment fee on every returned unit. A product with a $4.75 fulfillment fee that gets returned costs you $4.75 in returns processing on top of losing the sale.

**Removal and disposal fees:** If you want inventory removed from FBA, Amazon charges per-unit removal fees. Standard-size items run $0.97 to $1.64 per unit. Oversize items are higher.

## **What the Full Fee Stack Looks Like on a Real Product**

Product: kitchen gadget, selling price $29.99, weight 1.5 lbs, Home and Kitchen category.

| Fee                                         | Amount  |
| ------------------------------------------- | ------- |
| Referral fee (15%)                          | -$4.50  |
| FBA fulfillment fee (large standard 1.5 lb) | -$5.04  |
| Fuel surcharge (3.5% of $5.04)              | -$0.18  |
| Storage (monthly estimate, standard)        | -$0.15  |
| Inbound placement (minimal split estimate)  | -$0.50  |
| Total Amazon fees                           | -$10.37 |
| Revenue after Amazon fees                   | $19.62  |

Before COGS, advertising, or inbound shipping cost, Amazon takes $10.37 on a $29.99 sale. That is 34.6 percent of gross revenue.

If COGS is $8.00 and inbound shipping is $0.50, net profit is $11.12 and margin is 37.1 percent. That looks healthy. Add $2.00 in PPC spend and margin drops to 30.4 percent. If the return rate is 10 percent and returns processing costs $5.04 per return, the effective margin on 100 units sold is closer to 27 percent.

This is why the go/no-go decision on FBA profitability requires a full P&L, not just referral plus fulfillment. The FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) runs the complete calculation including COGS, inbound shipping, PPC, and target margin, and returns a GO, CAUTION, or NO-GO decision before you order inventory.

Rates verified July 22, 2026. See changelog (https://dimmath.com/changelog/).

## **FAQ**

Q: What are the main Amazon FBA fees in 2026?  
A: Amazon FBA fees include referral fees (8-15% of sale price depending on category), fulfillment fees ($3.22 to $6.97+ per unit based on size and weight), a 3.5% fuel surcharge on fulfillment fees effective April 17 2026, monthly storage fees ($0.78 per cubic foot standard, $2.40 in Q4), inbound placement fees ($0 to $1.30 per unit), and conditional fees including low inventory level fees and returns processing. Total fees typically consume 30-45% of selling price.

Q: What changed with Amazon FBA fees in 2026?  
A: Two changes took effect in 2026. On January 15, fulfillment fees increased by an average of $0.08 per unit, with products priced above $50 seeing higher average increases of $0.31 per unit. On April 17, Amazon introduced a 3.5% fuel surcharge applied to all FBA fulfillment fees. These changes stack: a product that paid $4.57 in fulfillment fees in 2025 now pays approximately $4.92 after both increases.

Q: How do I calculate my true FBA profit margin?  
A: Start with your selling price and subtract all fees: referral fee, fulfillment fee, fuel surcharge, storage estimate, inbound placement, and any PPC spend. Then subtract COGS and inbound shipping cost. The result is net profit. Divide by selling price for margin percentage. The FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) runs this calculation automatically and returns a GO, CAUTION, or NO-GO decision based on your target margin.

Q: What is the Amazon FBA fuel surcharge in 2026?  
A: Amazon introduced a 3.5% fuel surcharge on FBA fulfillment fees effective April 17, 2026. It is applied as a percentage of the base fulfillment fee on every unit sold. A product with a $5.04 fulfillment fee pays an additional $0.18 per unit in fuel surcharge. This surcharge applies to all standard and oversize FBA products and is separate from the January 2026 base fee increases.

---

# FBA Referral Fees by Category – Full Table 

https://dimmath.com/blog/fba-referral-fees-by-category-full-table/

The referral fee is Amazon's commission on every sale. It comes off the top before you see a dollar. It applies to FBA and FBM. It applies to the item price and any shipping you charge the buyer. And unlike fulfillment fees, which vary by size and weight, the referral fee is determined entirely by the category your product is listed in.

One clarification before the table: referral fees did not change in 2026. The rates below are the same as 2025. What changed in 2026 were fulfillment fees, storage fees, and inbound placement fees covered in detail in Amazon FBA Fees Explained (https://dimmath.com/blog/amazon-fba-fees-explained-complete-breakdown/). The referral rate is the one predictable element in an increasingly complex fee structure.

## **Full Referral Fee Table by Category – 2026**

| Category                           | Referral Fee                            | Notes                       |
| ---------------------------------- | --------------------------------------- | --------------------------- |
| Most categories                    | 15%                                     | Default rate                |
| Electronics                        | 8%                                      | All price points            |
| Computers                          | 8%                                      | All price points            |
| Camera and Photo                   | 8%                                      | All price points            |
| Cell Phones and Accessories        | 8%                                      | Phones only; accessories 8% |
| Consumer Electronics               | 8%                                      | All price points            |
| Video Game Consoles                | 8%                                      | All price points            |
| Personal Computers                 | 6%                                      | Lowest rate on Amazon       |
| Automotive                         | 12%                                     | All price points            |
| Industrial and Scientific          | 12%                                     | All price points            |
| Clothing and Accessories           | 5% under $15, 10% $15-$20, 17% over $20 | Tiered                      |
| Shoes and Handbags                 | 5% under $15, 10% $15-$20, 17% over $20 | Tiered                      |
| Grocery under $15                  | 8%                                      | Price-based tier            |
| Grocery over $15                   | 15%                                     | Price-based tier            |
| Health and Personal Care under $10 | 8%                                      | Price-based tier            |
| Health and Personal Care over $10  | 15%                                     | Price-based tier            |
| Jewelry under $250                 | 20%                                     | Tiered                      |
| Jewelry $250-$1,000                | 15%                                     | Tiered                      |
| Jewelry over $1,000                | 5%                                      | Tiered                      |
| Fine Art under $100                | 20%                                     | Tiered                      |
| Fine Art $100-$1,000               | 15%                                     | Tiered                      |
| Fine Art $1,000-$5,000             | 10%                                     | Tiered                      |
| Fine Art over $5,000               | 5%                                      | Tiered                      |
| Books                              | 15% + $1.80 closing fee                 | Per unit                    |
| Music                              | 15% + $1.80 closing fee                 | Per unit                    |
| DVDs                               | 15% + $1.80 closing fee                 | Per unit                    |
| Video Games                        | 15% + $1.80 closing fee                 | Per unit                    |
| Software                           | 15% + $1.80 closing fee                 | Per unit                    |
| Amazon Device Accessories          | 45%                                     | Highest rate                |
| Gift Cards                         | 20%                                     | All price points            |

Minimum referral fee: $0.30 per unit for most categories. If the calculated percentage produces a fee below $0.30, you pay $0.30. This matters significantly for low-priced items  more on that below.

## **Tiered Referral Fees – The Categories Where Price Changes the Rate**

Several categories use tiered referral fees where the percentage changes based on the sale price. Sellers in these categories need to model fees at their exact price point, not use a flat rate.

**Clothing and Accessories** restructured its tiers to benefit lower-priced items:

- Under $15: 5%
- $15 to $20: 10%
- Over $20: 17%

A $10 shirt pays $0.50 in referral fees. The same shirt at $25 pays $4.25. The tier jump at $20 is the most impactful pricing threshold in apparel after the $50 fulfillment fee threshold.

**Jewelry** rewards high-ticket items:

- Under $250: 20%
- $250 to $1,000: 15%
- Over $1,000: 5%

A $5,000 piece of jewelry has an effective blended referral rate of approximately 8.7% lower than electronics on a percentage basis, despite the high nominal rate at entry level.

**Grocery and Health and Personal Care** both use simple price-based tiers:

- Under threshold (varies): 8%
- Over threshold: 15%

Sellers in these categories should check whether pricing just below the threshold ($14.99 vs $15.00 for Grocery) changes the referral fee meaningfully enough to affect net margin.

## **The Minimum Fee Trap – What $0.30 Costs You at Low Price Points**

Every category has a minimum referral fee of $0.30 per unit (with a few exceptions). If the calculated percentage fee is below $0.30, you pay $0.30 regardless.

At what price point does the minimum kick in?

For a 15% category: $0.30 ÷ 15% = $2.00. Any product priced below $2.00 pays the minimum.  
For an 8% category: $0.30 ÷ 8% = $3.75. Any product priced below $3.75 pays the minimum.

The minimum fee is a regressive cost. A $2.00 accessory in a 15% category pays the minimum $0.30 an effective rate of 15%. A $1.50 accessory in the same category also pays $0.30 an effective rate of 20%.

For sellers with products priced under $5 in any category, the minimum fee deserves specific attention in your margin model. The FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) applies the minimum fee automatically when the calculated percentage drops below the threshold.

Media categories Books, Music, DVDs, Video Games, Software add a $1.80 variable closing fee per unit on top of the 15% referral fee. A $5 used book pays $0.75 in referral fees plus $1.80 closing fee $2.55 in combined fees on a $5 sale. That is 51 percent of the sale price in fees before FBA fulfillment, storage, or COGS.

## **Referral Applies to Shipping – The Cost Most Sellers Miss**

The referral fee is calculated on the total amount the buyer pays item price plus any shipping charges. It does not apply to sales tax.

If you list a product at $19.99 with $4.99 shipping, the referral fee is calculated on $24.98, not $19.99.

At 15%: $24.98 × 15% = $3.75 versus $19.99 × 15% = $3.00. That is $0.75 extra in referral fees per order from the shipping charge alone.

FBA sellers typically offer free shipping (Prime covers delivery). The referral fee on a Prime listing with free shipping applies only to the item price. But FBM sellers who charge shipping need to include the shipping amount in their referral fee calculation or their margin model understates the cost.

## **Category Choice as a Margin Decision**

The referral fee is set at listing. The browse node you assign determines the category. The category determines the rate. Category misassignment intentional or accidental costs real money.

A product correctly listed in Electronics at 8% versus incorrectly listed in Home and Kitchen at 15% on a $30 sale:  
Electronics: $30 × 8% = $2.40  
Home and Kitchen: $30 × 15% = $4.50

$2.10 difference per unit. At 500 units per month: $1,050 per month from the wrong browse node assignment.

Amazon audits category assignments. Deliberate miscategorization to access a lower referral rate violates seller policies and can result in listing removal or account suspension. The rate difference needs to come from legitimate category eligibility not misassignment.

Where legitimate opportunity exists: products that genuinely qualify for multiple categories. A smart speaker could qualify as Consumer Electronics (8%) or Amazon Device Accessories (45%) depending on how it is positioned. A fitness tracker could be Sports and Outdoors (15%) or Consumer Electronics (8%). When a product legitimately belongs in multiple categories, choose the one with the lower referral rate.

The GO/NO-GO impact of category choice is significant. For the same product at $24.99 with $8.00 COGS and $5.00 fulfillment costs, the full margin comparison is in FBA Profit Margin Benchmarks by Category (https://dimmath.com/blog/fba-profit-margin-benchmarks-by-category/) which maps referral rates to realistic margin ranges across 10 categories.

## **Pricing Floor by Category – The Minimum Price to Not Lose Money**

The referral fee creates a category-specific pricing floor. Below that floor, every unit sold loses money before COGS and fulfillment are even counted.

**Pricing floor formula:**  
Minimum Price = (COGS + FBA Fee + Fuel Surcharge + Inbound Shipping) ÷ (1 − Referral Fee %)

Example: product with $6.00 COGS, $4.30 small standard fulfillment fee, $0.15 fuel surcharge, $0.50 inbound shipping.

Total costs: $10.95

At 15% referral (Home and Kitchen): $10.95 ÷ 0.85 = $12.88 minimum price  
At 8% referral (Electronics): $10.95 ÷ 0.92 = $11.90 minimum price

The electronics category allows a $0.98 lower minimum price before breaking even or equivalently, $0.98 more net profit at the same selling price.

For a product priced at $14.99 in both categories:  
At 15%: Net before PPC = $14.99 − $2.25 referral − $10.95 costs = $1.79 per unit  
At 8%: Net before PPC = $14.99 − $1.20 referral − $10.95 costs = $2.84 per unit

$1.05 per unit difference from category choice alone. At 1,000 units per month: $1,050 per month.

The FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) calculates your exact pricing floor and net profit at your category's referral rate alongside all other 2026 fees. The full step-by-step profit calculation including how referral fee feeds into the break-even formula is in How to Calculate FBA Profit (https://dimmath.com/blog/how-to-calculate-fba-profit-cogs-fees-break-even-walkthrough/).

Rates verified June 19, 2026. See changelog (https://dimmath.com/changelog/).

## **FAQ**

Q: What are Amazon referral fees by category in 2026?  
A: Most categories charge 15%. Electronics, Computers, Camera, Cell Phones, and Consumer Electronics charge 8%. Personal Computers charge 6% the lowest rate. Amazon Device Accessories charge 45% the highest. Clothing charges 5% under $15, 10% from $15-$20, and 17% over $20. Jewelry charges 20% under $250, 15% from $250-$1,000, and 5% above $1,000. Referral fees did not change in 2026.

Q: Does Amazon referral fee apply to shipping charges?  
A: Yes. The referral fee is calculated on the total amount the buyer pays item price plus any shipping charges collected. It does not apply to sales tax. FBA sellers with Prime free shipping pay referral only on the item price. FBM sellers who charge shipping must include the shipping amount in their referral fee calculation.

Q: What is the minimum Amazon referral fee?  
A: The minimum referral fee is $0.30 per unit for most categories. If the calculated percentage fee is below $0.30, you pay $0.30 regardless. Media categories Books, Music, DVDs, Video Games, Software add a $1.80 variable closing fee per unit on top of the 15% referral fee.

Q: How does category choice affect FBA profit margin?  
A: The referral fee is determined by the category your product is listed in. The same product at 8% versus 15% referral saves $2.10 per unit on a $30 sale. At 1,000 units per month that is $2,100 per month difference from category assignment alone. When a product legitimately qualifies for multiple categories, choose the one with the lower referral rate. Use the FBA Fee Calculator (https://dimmath.com/fba-fee-calculator/) to model the margin impact of category choice on your specific product.

---

# MPF and HMF Fees Explained – 0.3464%, Min/Max, When Each Applies

https://dimmath.com/blog/mpf-and-hmf-fees-explained-03464-minmax-when-each-applies/

Most importers budget for duty. Fewer budget for the two user fees that sit alongside it on every customs entry. The Merchandise Processing Fee and the Harbor Maintenance Fee are not duties. They are CBP user fees charged in addition to duty on virtually every formal US import. Getting them wrong in your landed cost model means every margin calculation is wrong by a predictable amount.

## **Merchandise Processing Fee – Rate, Minimum, Maximum**

The Merchandise Processing Fee funds CBP customs processing operations. It applies to formal entries and certain informal entries regardless of transport mode: ocean, air, truck, or rail.

**2026 MPF rates:**  
Formal entry (commercial value over $2,500): 0.3464% of customs value  
Minimum per formal entry: $33.58  
Maximum per formal entry: $651.50

Informal entry (commercial value under $2,500): flat fee of $2.49 for manual processing or $1.16 for electronic processing.

The minimum and maximum create a non-linear cost curve. At low shipment values, MPF costs more as a percentage of customs value than the 0.3464% headline rate suggests. At high shipment values, MPF costs less.

**MPF breakeven points:**  
Below $9,694 customs value: MPF hits the $33.58 minimum. You pay $33.58 regardless of the lower calculated amount.  
Between $9,694 and $188,076 customs value: MPF equals exactly 0.3464% of customs value.  
Above $188,076 customs value: MPF hits the $651.50 maximum. You pay $651.50 regardless of the higher calculated amount.

**Real dollar examples:**

$5,000 shipment: 0.3464% = $17.32. But minimum applies. You pay $33.58.  
$50,000 shipment: 0.3464% = $173.20. Within range. You pay $173.20.  
$300,000 shipment: 0.3464% = $1,039.20. Maximum applies. You pay $651.50.

For high-value shipments, the MPF cap creates a consolidation opportunity covered in a later section.

The MPF is calculated on the entered customs value of the goods. This is typically the transaction value, meaning what you actually paid the supplier. It does not include duties, freight, or insurance. Those are added on top.

## **Harbor Maintenance Fee – Rate, Applicability, No Cap**

The Harbor Maintenance Fee funds maintenance of US ports and harbors under the Army Corps of Engineers. It was established by the Water Resources Development Act of 1986 and the rate has been unchanged since 1987.

**2026 HMF rate:** 0.125% of cargo value  
**Minimum:** None  
**Maximum:** None

HMF applies only to ocean freight. Air cargo, truck freight, rail freight, and courier shipments do not pay HMF. If your goods arrive by sea at a US port, HMF applies. If they arrive by air at a US airport, only MPF applies.

The absence of a cap on HMF is important for high-value ocean shipments. On a $1,000,000 container, MPF is capped at $651.50. HMF on the same container is $1,250. HMF becomes the larger of the two fees above approximately $521,000 in cargo value, where HMF ($651.25) exceeds the MPF cap ($651.50).

**Real dollar examples:**

$50,000 ocean shipment: HMF = $50,000 × 0.00125 = $62.50  
$200,000 ocean shipment: HMF = $200,000 × 0.00125 = $250.00  
$1,000,000 ocean shipment: HMF = $1,000,000 × 0.00125 = $1,250.00

For air freight shipments, HMF is $0. For the same $50,000 shipment arriving by air: MPF = $173.20, HMF = $0. Total user fees: $173.20. The same shipment by ocean: MPF = $173.20, HMF = $62.50. Total user fees: $235.70.

## **The Complete Landed Cost Formula**

MPF and HMF are not optional lines. They belong in every landed cost calculation from the first day you model a new product.

**Landed Cost = Product Cost + International Freight + Marine Insurance + Duty + MPF + HMF (ocean only) + Customs Broker Fee + Drayage + Domestic Transport**

Working example: $50,000 electronics shipment by ocean from Vietnam, 6% duty rate.

| Line Item                      | Amount         |
| ------------------------------ | -------------- |
| Product cost                   | $50,000.00     |
| International ocean freight    | $2,800.00      |
| Marine insurance (0.5%)        | $250.00        |
| Duty (6% of $50,000)           | $3,000.00      |
| MPF (0.3464% of $50,000)       | $173.20        |
| HMF (0.125% of $50,000)        | $62.50         |
| Customs broker fee             | $250.00        |
| Drayage and domestic transport | $400.00        |
| **Total Landed Cost**          | **$56,935.70** |

MPF plus HMF add $235.70 on this shipment. That is 0.47% of the product cost. Across 20 entries per year at similar values, that is $4,714 per year in user fees that sellers who model only duty are missing.

The HS Duty Estimator (https://dimmath.com/hs-duty-estimator/) calculates estimated duty and MPF on your specific HTS code and shipment value, giving you the core customs cost to plug into your landed cost model.

## **USMCA Exemption, Consolidation Strategy, and Drawback**

**USMCA MPF Exemption**

Goods qualifying under the United States-Mexico-Canada Agreement are exempt from MPF when properly claimed on the customs entry. The exemption applies only to MPF, not HMF. HMF still applies to qualifying USMCA goods arriving by ocean.

The key requirement: goods must genuinely originate in the US, Mexico, or Canada under USMCA rules of origin. The rules are product-specific and can be complex. A product assembled in Mexico from Chinese-origin components may not qualify for USMCA treatment without meeting the specific tariff shift or regional value content rules for that product category.

Textiles and apparel imported under Tariff Preference Level provisions are generally not eligible for the MPF exemption even when imported under USMCA, because TPL goods do not technically originate in the USMCA territory under the agreement's rules.

Most US free trade agreements include MPF exemptions for qualifying goods. Check the Special column in the HTS for your product's HTS code to confirm which trade programs apply.

**Consolidation Strategy**

MPF is charged per formal entry, not per shipment value. Five separate entries from the same supplier each pay MPF individually. One consolidated entry covering the same goods pays MPF once, capped at $651.50.

Example: Five $40,000 entries from the same supplier in one month.  
Five separate entries: 5 × ($40,000 × 0.3464%) = 5 × $138.56 = $692.80 total MPF  
One consolidated $200,000 entry: $200,000 × 0.3464% = $692.80, but capped at $651.50

Saving on this consolidation: $41.30. At 12 months per year: $495.60 per year from one supplier.

The savings grow significantly at higher values. Twenty $40,000 entries per year: 20 × $138.56 = $2,771.20. Four consolidated $200,000 entries: 4 × $651.50 = $2,606. Annual saving: $165.20.

Consolidation must follow CBP rules around same supplier, same port, and entry timing. Your customs broker can advise on whether your import pattern qualifies.

**MPF and HMF Drawback Eligibility**

Both MPF and HMF are eligible for duty drawback when imported merchandise is subsequently exported or destroyed under CBP supervision. Importers can recover up to 99% of MPF and HMF paid under the drawback program. This is relevant for sellers who import goods and later re-export them or process them into exported products.

## **How De Minimis Elimination Changed MPF Exposure**

Before August 2025, shipments valued at $800 or less entered the US under Section 321 de minimis treatment with no MPF, no HMF, and no formal entry. Millions of e-commerce packages per day cleared with zero user fees.

As covered in the Section 321 De Minimis guide (https://dimmath.com/blog/section-321-de-minimis-800-how-it-works-who-qualifies/), de minimis treatment was suspended for China in May 2025 and for all countries in August 2025. Every package that previously cleared with no MPF now faces MPF on informal entry at $1.16 for electronic processing or the full 0.3464% on formal entries.

For sellers shipping hundreds or thousands of individual packages per month that previously qualified for de minimis, the MPF exposure is a new recurring cost that needs to be built into pricing.

Example: 500 packages per month at $150 average value, all now requiring informal entry.  
Electronic informal entry MPF: 500 × $1.16 = $580 per month  
Manual informal entry MPF: 500 × $2.49 = $1,245 per month

The shift from zero MPF to $580 to $1,245 per month from de minimis elimination alone, before any duty costs are considered.

To find the correct HTS code for your products and calculate the full customs cost including duty and MPF, see the HS Code Finder Guide. (https://dimmath.com/blog/hs-code-finder-guide-how-to-classify-hts-lookup-walkthrough/)

Rates verified June 19, 2026. See changelog (https://dimmath.com/changelog/).

## **FAQ**

Q: What is the Merchandise Processing Fee (MPF) in 2026?  
A: On CBP’s User Fee Table (https://www.cbp.gov/trade/basic-import-export/user-fee-table), formal-entry MPF is 0.3464% of customs value with a $33.58 minimum and $651.50 maximum (plus a $4.03 manual surcharge when it applies). Informal entries are listed as $2.69, $8.06, or $12.09. Mail shipments other than inbound EMS are exempt from MPF per CBP’s e-commerce FAQs (https://www.cbp.gov/trade/basic-import-export/e-commerce/faqs).

Q: What is the Harbor Maintenance Fee (HMF) in 2026?  
A: The HMF is 0.125% of the cargo value on ocean freight shipments. There is no minimum and no maximum. The rate has been unchanged since 1987. HMF applies only to goods arriving by ocean vessel at US ports. Air cargo, truck freight, rail, and courier shipments do not pay HMF. On a $50,000 ocean shipment, HMF is $62.50.

Q: Are MPF and HMF exempt for USMCA goods?  
A: MPF is exempt for goods that genuinely qualify under USMCA rules of origin when properly claimed on the entry. HMF is not exempt, even for USMCA-qualifying goods arriving by ocean. The USMCA MPF exemption applies only to goods that meet product-specific rules of origin under the agreement. Goods imported under Tariff Preference Level provisions are generally not eligible for the MPF exemption even under USMCA.

Q: Can MPF and HMF be recovered through duty drawback?  
A: Yes. Both MPF and HMF are eligible for duty drawback when imported merchandise is subsequently exported or destroyed under CBP supervision. Importers can recover up to 99% of MPF and HMF paid through the drawback program. This is separate from duty drawback and requires documentation of the export or destruction. Use the HS Duty Estimator (https://dimmath.com/hs-duty-estimator/) to calculate your total customs cost including MPF before modeling drawback recovery.

---

# Additional Handling Surcharge 2026: UPS & FedEx Thresholds

https://dimmath.com/blog/ups-and-fedex-additional-handling-surcharge/

A seller ships a 48-inch ski. The label says $13. The invoice three weeks later says $78. Nothing changed except the package crossed a size threshold that triggered an Additional Handling Surcharge. The carrier never warned them at label creation. The charge appeared after delivery.

This is one of the most common surprise billing situations in ecommerce shipping in 2026. Two changes made it worse this year. Both UPS and FedEx added cubic volume as a new surcharge trigger. And ceiling rounding introduced in August 2025 means packages with fractional dimensions now measure larger before the cubic calculation runs.

## **Two Surcharges – Additional Handling and Large Package**

UPS and FedEx use two distinct size-based surcharges. They have different thresholds, different costs, and different triggers. Understanding which one applies to your packages is the first step to avoiding surprise invoices.

**Additional Handling Surcharge (AHS):**  
Applied when a package requires manual handling outside the carrier's automated sorting network. Automated systems process standard rectangular boxes within normal size ranges. Packages that fall outside those ranges require human intervention at the facility.

In 2026 both carriers added a new cubic volume trigger to the existing AHS criteria. A package now triggers AHS if any of the following apply:

Longest side exceeds 48 inches.  
Second longest side exceeds 30 inches.  
Actual weight exceeds 50 lbs (US domestic) or 55 lbs (international).  
Cubic volume exceeds 10,368 cubic inches. **New effective January 2026.**  
Package is not fully encased in an outer shipping container.  
Package is encased in an outer shipping container made of metal or wood.

**Large Package Surcharge:**  
Applied when a package exceeds UPS and FedEx's largest standard size criteria. This is a more expensive surcharge than AHS and applies to the largest packages.

Triggers when:  
Cubic volume exceeds 17,280 cubic inches. **New effective January 2026.**  
Weight exceeds 110 lbs.  
Length plus girth exceeds 165 inches at UPS or 157 inches at FedEx.

A package can trigger only one size surcharge per shipment. If it meets both AHS and Large Package criteria, only the Large Package Surcharge applies since it is the higher charge.

  <img
    src="https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-1024.webp"
    srcset="https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-1024.webp 1024w, https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-768.webp 768w, https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-640.webp 640w, https://pagesmith-cdn.com/64019a59/images/a-clean-educational-diagram-illustrating-package-measurement-e4cab7d2-320.webp 320w"
    sizes="(max-width: 768px) 100vw, 768px"
    alt="DimMath package measurement diagram showing length, width, height, volume threshold, and the rule that Large Package replaces Additional Handling when both apply"
    class="w-full h-auto object-contain"
    loading="lazy"
    width="1024"
    height="572"
  />
  
    Planning estimate — verify final charges on your carrier invoice.

  

For the complete carrier-by-carrier surcharge reference alongside DIM weight divisors, see DIM Weight by Carrier (https://dimmath.com/blog/dim-weight-divisors-by-carrier-full-table/).

## **The New Cubic Volume Thresholds – What 10,368 and 17,280 Actually Look Like**

The cubic volume thresholds are the most important 2026 change for ecommerce sellers because they catch packages that previously avoided surcharges by staying within the length and girth rules.

**10,368 cubic inches (Additional Handling threshold):**  
This is the volume of a box approximately 22 × 22 × 22 inches. Any combination of length, width, and height that multiplies to more than 10,368 triggers AHS.

Examples of boxes that exceed 10,368 cubic inches:

- 24 × 22 × 20 inches: 10,560 cubic inches. Triggers AHS.
- 30 × 20 × 18 inches: 10,800 cubic inches. Triggers AHS.
- 36 × 18 × 16 inches: 10,368 cubic inches. Exactly at threshold. Any fractional inch pushes it over.
- 48 × 12 × 18 inches: 10,368 cubic inches. Same as above.

Examples of boxes that stay below 10,368 cubic inches:

- 22 × 22 × 21 inches: 10,164 cubic inches. Below threshold.
- 30 × 18 × 18 inches: 9,720 cubic inches. Below threshold.
- 24 × 20 × 20 inches: 9,600 cubic inches. Below threshold.

**17,280 cubic inches (Large Package threshold):**  
This is the volume of a box approximately 26 × 26 × 26 inches.

Examples that exceed 17,280 cubic inches:

- 30 × 24 × 24 inches: 17,280 cubic inches. Exactly at threshold.
- 36 × 24 × 20 inches: 17,280 cubic inches. Exactly at threshold.
- 48 × 20 × 18 inches: 17,280 cubic inches. Exactly at threshold.

Any package exactly at 17,280 cubic inches is at the boundary. After ceiling rounding, a package measuring 29.5 × 24 × 24 inches rounds to 30 × 24 × 24 and crosses the threshold. Before August 2025 it would have calculated at 16,992 cubic inches and avoided the surcharge.

## **How Ceiling Rounding Made the Surcharge Problem Worse**

UPS and FedEx introduced ceiling rounding in August 2025. Every fractional inch now rounds up to the next whole inch before any calculation runs. This change directly increases the number of packages that cross both cubic volume thresholds.

**The compounding effect:**

A package measuring 23.5 × 21.8 × 19.3 inches before August 2025:  
Cubic volume: 23.5 × 21.8 × 19.3 = 9,889 cubic inches. Below 10,368. No AHS.

The same package after August 2025 with ceiling rounding:  
Rounds to 24 × 22 × 20 inches.  
Cubic volume: 24 × 22 × 20 = 10,560 cubic inches. Above 10,368. AHS triggers.

The physical package did not change. The dimensions did not change. The ceiling rounding rule pushed the calculated cubic volume over the threshold.

This is why sellers who shipped the same product in the same box for years without triggering surcharges are suddenly seeing AHS charges in 2026. The package crossed the threshold on paper due to ceiling rounding even though nothing changed physically.

**What this means in practice:**  
Any package with fractional dimensions near the 10,368 or 17,280 cubic inch thresholds needs to be evaluated at ceiling-rounded dimensions, not actual measured dimensions. A package that calculates to 10,100 cubic inches at actual dimensions may calculate to 10,560 after ceiling rounding and trigger AHS.

The DIM Weight Calculator (https://dimmath.com/dim-weight-calculator/) applies ceiling rounding automatically before calculating cubic volume. Enter your dimensions and it shows whether your package crosses either surcharge threshold at rounded dimensions.

## **The 40 Pound Minimum – FedEx's Hidden Cost Multiplier**

When FedEx applies the Additional Handling Surcharge for dimensional reasons (cubic volume over 10,368 cubic inches or longest side over 48 inches), it also applies a 40 pound minimum billable weight to the shipment.

This means even if your package weighs 2 lbs and its DIM weight calculates to 8 lbs, once it triggers AHS on dimensional grounds FedEx bills it as a 40 lb shipment for rate calculation purposes.

A 2 lb product in a 24 × 22 × 20 inch box:  
Actual weight: 2 lbs  
DIM weight: (24 × 22 × 20) ÷ 139 = 76 lbs  
FedEx billable weight with AHS minimum: 76 lbs (DIM weight exceeds minimum)

A 2 lb product in a 24 × 22 × 20 inch box where DIM weight was somehow lower:  
If DIM weight calculated to 35 lbs, the 40 lb minimum would apply and FedEx bills at 40 lbs.

The practical effect: the 40 lb minimum is most dangerous for lightweight products in large boxes where DIM weight is below 40 lbs but the package still triggers AHS on cubic volume. Sellers who right-size packaging for DIM weight but end up just over the cubic threshold now face a double hit: the AHS surcharge plus the 40 lb minimum billing.

Verify whether UPS applies the same minimum to AHS packages against your current UPS service guide before assuming the same rule applies.

## **How to Check and Avoid the Surcharges**

**Step 1: Calculate cubic volume at ceiling-rounded dimensions.**  
Measure your packed box exterior. Round each dimension up to the next whole inch. Multiply length × width × height. If the result exceeds 10,368 cubic inches you are in AHS territory. If it exceeds 17,280 you are in Large Package territory.

**Step 2: Check the longest side separately.**  
Even if cubic volume is below 10,368, a longest side over 48 inches triggers AHS regardless. Long narrow packages like tubes, ski bags, tent poles, and curtain rods commonly trigger AHS on length alone even when cubic volume is acceptable.

**Step 3: Evaluate packaging options.**  
If cubic volume is between 9,500 and 10,368 cubic inches, evaluate whether reducing any dimension by 1 to 2 inches brings the package below the threshold. A box that is 24 × 22 × 20 (10,560 cubic inches) can be reduced to 23 × 22 × 20 (10,120 cubic inches) by narrowing one dimension by 1 inch. That single change eliminates the AHS on cubic volume grounds.

If cubic volume is approaching 17,280 cubic inches, the same evaluation applies but with a higher stakes outcome. The Large Package Surcharge is significantly more expensive than AHS.

**Step 4: Consider LTL for packages consistently triggering surcharges.**  
If the same product consistently triggers AHS or Large Package Surcharge every shipment, the parcel network may not be the right mode. LTL freight does not apply parcel surcharges. For products where the combined carrier rate plus AHS or Large Package Surcharge exceeds what LTL would cost for the same lane, LTL produces lower total cost. The tradeoff is transit time and freight complexity.

For the full range of tactics to reduce package size and avoid DIM weight related costs, see How to Reduce DIM Weight (https://dimmath.com/blog/how-to-reduce-dim-weight-6-packaging-tactics-that-save-real-money/).

## **Why This Is Happening More in 2026 Than Before**

Three changes converged in 2026 to make additional handling surcharges more common and more expensive than they have ever been.

**Change 1: New cubic volume thresholds added January 2026.**  
Before 2026, AHS and Large Package triggers were based on length and girth only. A package could be very large in cubic volume without triggering a surcharge as long as no single dimension exceeded the length threshold and girth stayed within limits. The new cubic volume triggers catch packages that previously slipped through.

**Change 2: Ceiling rounding added August 2025.**  
Every fractional inch rounds up before cubic volume is calculated. Packages near the thresholds that previously calculated just below them now calculate just above them after rounding.

**Change 3: Surcharge amounts increased 7 to 9 percent in 2026.**  
Both UPS and FedEx raised AHS and Large Package Surcharge amounts alongside the GRI. The surcharges that sellers are now triggering more often are also more expensive than they were last year.

The combination means a seller can be doing everything the same as 2024 and paying significantly more in 2026 purely from policy changes. The fix is not switching carriers. It is measuring accurately, applying ceiling rounding before calculating, and designing packaging to stay below the thresholds.

Verify current surcharge amounts for your specific service level and zone in the UPS and FedEx 2026 service guides before modeling the cost impact on your specific shipment profile. Rates verified June 19, 2026. See changelog (https://dimmath.com/changelog/).

## **FAQ**

Q: What triggers the UPS and FedEx Additional Handling Surcharge in 2026?  
A: The Additional Handling Surcharge triggers when any of the following apply: longest side exceeds 48 inches, second longest side exceeds 30 inches, actual weight exceeds 50 lbs for US domestic shipments, cubic volume exceeds 10,368 cubic inches (new in 2026), or the package is not fully encased in a standard outer shipping container. Both UPS and FedEx added the cubic volume trigger effective January 2026. Use the Oversize & Additional Handling Surcharge Calculator (/shipping-surcharge-calculator/) to check which fees trigger after ceiling rounding. Calculate your fees → (/shipping-surcharge-calculator/)

Q: What is the cubic volume threshold for UPS and FedEx surcharges in 2026?  
A: The Additional Handling Surcharge triggers when cubic volume exceeds 10,368 cubic inches (approximately a 22 × 22 × 22 inch box). The Large Package Surcharge triggers when cubic volume exceeds 17,280 cubic inches (approximately a 26 × 26 × 26 inch box) or weight exceeds 110 lbs. Both thresholds are calculated after ceiling rounding is applied. Since August 2025 UPS and FedEx round every fractional inch up to the next whole inch before calculating cubic volume, which pushes more packages over both thresholds than before.

Q: How does ceiling rounding affect additional handling surcharge exposure?  
A: Ceiling rounding introduced by UPS and FedEx in August 2025 rounds every fractional inch up to the next whole inch before any size calculation runs. A package measuring 23.5 × 21.8 × 19.3 inches calculates to 9,889 cubic inches at actual dimensions but 10,560 cubic inches after ceiling rounding to 24 × 22 × 20. The ceiling-rounded volume exceeds the 10,368 cubic inch AHS threshold. The physical package did not change but the surcharge now applies. Any package with fractional dimensions near either cubic threshold needs to be evaluated at ceiling-rounded dimensions.

Q: What is the 40 pound minimum billable weight on FedEx additional handling?  
A: When FedEx applies the Additional Handling Surcharge for dimensional reasons (cubic volume over 10,368 cubic inches or longest side over 48 inches) it applies a 40 pound minimum billable weight to the shipment. Even if your package weighs 2 lbs and its DIM weight is below 40 lbs, FedEx bills the shipment at a minimum of 40 lbs for rate calculation. This minimum applies on top of the AHS surcharge itself. Verify whether UPS applies the same minimum against your current UPS service guide.

---