How to Calculate FBA Profit – COGS, Fees, Break-Even
Most FBA sellers know their selling price and their product cost. Very few know their actual net profit per unit after every fee is accounted for. The gap between what you think you are making and what you are actually making is where FBA businesses quietly fail.
This is the complete step-by-step walkthrough the same calculation the FBA Fee Calculator runs automatically.
The Complete FBA Profit Formula
Net profit is what remains after every cost is subtracted from your selling price.
Net Profit = Selling Price − Referral Fee − FBA Fulfillment Fee − Fuel Surcharge − COGS − Inbound Shipping − PPC Spend − Storage Estimate
Margin % = Net Profit ÷ Selling Price × 100
Every term in that formula has a specific source. None are optional. Sellers who omit PPC, storage, or inbound shipping are calculating a number that does not exist in their bank account.
The 2026 formula includes one addition compared to 2025: the 3.5% fuel surcharge on FBA fulfillment fees effective April 17, 2026. If your profit model was built before April 2026, it does not include this cost.
Full breakdown of every fee type and current 2026 rates is in Amazon FBA Fees Explained.
Step-by-Step Calculation – Worked Example
Product: kitchen gadget, selling price $29.99, weight 1.5 lbs, Home and Kitchen category, Large Standard size tier.
Step 1: Calculate the referral fee.
Referral fee = Selling Price × Category Rate
$29.99 × 15% = $4.50
Step 2: Calculate the FBA fulfillment fee.
Look up your size tier and weight in the 2026 fee table. Large Standard 1-1.5 lb = $5.04.
Step 3: Calculate the fuel surcharge.
Fuel surcharge = FBA Fulfillment Fee × 3.5%
$5.04 × 3.5% = $0.18
Step 4: Enter your COGS.
COGS = landed cost per unit including product cost, freight, duties, and prep.
Example: $8.00
Step 5: Enter inbound shipping per unit.
This is your cost to ship inventory to Amazon’s warehouse, divided by units in the shipment.
Example: $0.50
Step 6: Enter PPC spend per unit.
Total monthly ad spend divided by units sold per month.
Example: $2.00 (at 15% of revenue on a $29.99 product)
Step 7: Estimate storage per unit.
Monthly storage cost divided by units moved per month. For a small standard-size item selling 100 units per month with 0.1 cubic feet per unit: ($0.78 × 0.1) ÷ 1 = $0.08 per unit off-peak.
Example: $0.15
Step 8: Calculate net profit.
| Line | Amount |
|---|---|
| Selling price | $29.99 |
| Referral fee (15%) | -$4.50 |
| FBA fulfillment fee | -$5.04 |
| Fuel surcharge (3.5%) | -$0.18 |
| COGS | -$8.00 |
| Inbound shipping | -$0.50 |
| PPC spend | -$2.00 |
| Storage estimate | -$0.15 |
| Net profit | $9.62 |
| Margin | 32.1% |
32.1 percent margin at a 15 percent target: GO.
Break-Even Price – What You Must Charge to Not Lose Money
Break-even price is the minimum selling price at which net profit equals zero before advertising.
Break-Even Price = (COGS + FBA Fulfillment Fee + Fuel Surcharge + Inbound Shipping) ÷ (1 − Referral Fee %)
Using the example above:
($8.00 + $5.04 + $0.18 + $0.50) ÷ (1 − 0.15)
= $13.72 ÷ 0.85
= $16.14
At $16.14 you cover all fees and COGS with zero net profit before PPC. Every dollar below that price is a loss per unit. Every dollar above it contributes to net profit before advertising.
Add PPC to find your true break-even including advertising:
True Break-Even = Break-Even (No Ads) + PPC Per Unit ÷ (1 − Referral Fee %)
= $16.14 + ($2.00 ÷ 0.85)
= $16.14 + $2.35
= $18.49
At $18.49 you cover every cost including advertising with zero net profit. Anything above that price is true margin.
Target Price – What You Need to Charge to Hit Your Margin Goal
Break-even tells you the floor. Target price tells you what you need to charge to hit a specific margin goal.
Target Price = (COGS + FBA Fee + Fuel Surcharge + Inbound Shipping) ÷ (1 − Referral Fee % − Target Margin %)
Example: same product, target margin 20%.
($8.00 + $5.04 + $0.18 + $0.50) ÷ (1 − 0.15 − 0.20)
= $13.72 ÷ 0.65
= $21.11
At $21.11 you hit exactly 20 percent margin before PPC. If PPC is $2.00 per unit, your effective margin drops to approximately 10 percent. To hit 20 percent after PPC, solve for a higher price or lower PPC spend.
The FBA Fee Calculator calculates both break-even price and target price automatically. Enter your COGS, inbound shipping, PPC, and target margin and it returns the exact price needed to hit your goal alongside the GO/NO-GO decision.
The GO/NO-GO Decision
Once you have net profit and margin, the GO/NO-GO decision is straightforward.
GO: Margin meets or exceeds your target. The product is profitable at current pricing. Standard signal to proceed with sourcing or scaling.
CAUTION: Margin is between 5 percent and your target. The product is profitable but fragile. One fee increase, a PPC cost increase, or a supplier price increase moves it to NO-GO. Do not scale a CAUTION product. Fix the margin first.
NO-GO: Margin is below 5 percent. Do not order inventory. The product is unprofitable or at imminent risk. Identify which cost is driving the problem — COGS, PPC, size tier — and solve it before proceeding.
For category-level benchmarks on what constitutes a healthy margin in your product category, see FBA Profit Margin Benchmarks by Category.
Scenario Planning – Best, Base, and Worst Case
A single calculation gives you one data point. Scenario planning gives you the range your product can operate across.
Run three versions of the same calculation:
| Scenario | COGS | Selling Price | PPC/Unit | Net Profit | Margin | Decision |
|---|---|---|---|---|---|---|
| Best case | $6.50 | $32.99 | $1.50 | $13.11 | 39.7% | GO |
| Base case | $8.00 | $29.99 | $2.00 | $9.62 | 32.1% | GO |
| Worst case | $9.50 | $27.99 | $3.00 | $4.31 | 15.4% | CAUTION |
The worst case uses higher COGS (supplier price increase or freight cost increase), lower selling price (competitive pressure), and higher PPC (more competition at launch). At 15.4 percent the product is still profitable but at CAUTION.
This tells you the product has a workable floor. A product whose worst case produces a NO-GO needs either a higher price ceiling, a lower COGS, or a different PPC strategy before it is worth sourcing.
Run this table before every new product order. It takes 10 minutes and tells you exactly how much margin risk you are taking on.
Rates verified June 19, 2026. See changelog.
You've read the theory—now see the actual math for your packages. Use our Carrier Savings Engine to identify 'Savings Gaps' in your packaging and discover the cheapest way to ship your products.
Check My Savings →FAQ
Q: How do I calculate FBA profit per unit?
A: Net Profit = Selling Price − Referral Fee − FBA Fulfillment Fee − Fuel Surcharge (3.5% of fulfillment fee) − COGS − Inbound Shipping − PPC Spend − Storage Estimate. Divide net profit by selling price and multiply by 100 for margin percentage. The FBA Fee Calculator runs this calculation automatically with all 2026 fees built in.
Q: What is the FBA break-even price formula?
A: Break-Even Price = (COGS + FBA Fulfillment Fee + Fuel Surcharge + Inbound Shipping) ÷ (1 − Referral Fee %). This gives you the minimum selling price to cover all costs before advertising. Add PPC spend to find your true break-even including advertising.
Q: What is the target price formula for a specific FBA margin?
A: Target Price = (COGS + FBA Fee + Fuel Surcharge + Inbound Shipping) ÷ (1 − Referral Fee % − Target Margin %). For a 20% target margin with 15% referral fee and $13.72 in total costs: $13.72 ÷ (1 − 0.15 − 0.20) = $13.72 ÷ 0.65 = $21.11.
Q: What does CAUTION mean in an FBA profit calculation?
A: CAUTION means your net margin is between 5 percent and your target margin. The product is profitable but fragile — one fee increase, COGS increase, or PPC spike pushes it to NO-GO. Do not scale a CAUTION product without first improving the margin. Use the FBA Fee Calculator to model what price or COGS change moves it to GO.