DIM Weight Divisors by Carrier 2026 (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)	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)	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)	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. That tool is a separate code path (R02); correcting this article does not by itself repair calculator output.

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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? (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), 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 and FedEx vs UPS Ground Rates Comparison.

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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 for Ground Advantage; DMM 223 §1.4 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 > 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.

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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).

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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 and Dimensional Weight International Divisor Map.

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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 and Dimensional Weight vs Actual Weight.

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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). 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 > 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.

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Related Rate Guides & Calculators

• DIM Weight Calculator – Multi-carrier billable weight (separate from this article)
• How to Calculate DIM Weight
• Dimensional Weight vs Actual Weight
• USPS Cubic vs Ground Advantage
• Cheapest Carrier by Zone Comparison Table