Calculators
Amazon FBA Fee Calculator
Calculate Amazon FBA profit per unit after referral, fulfilment, storage and advertising costs, with break-even ACoS.
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The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Checking product viability before sourcing
- Setting a target ACoS for sponsored ads
- Comparing FBA with merchant fulfilment
- Pricing a new listing
About this tool
What the Amazon FBA Fee Calculator does
Selling through Fulfilment by Amazon means paying a referral fee on each sale, a per-unit fulfilment fee based on size and weight, and storage fees. This calculator subtracts all of them, plus product, inbound shipping and advertising costs, to show real profit and the maximum ad cost of sale you can afford.
Formula
- Amazon fees = price × referral rate + FBA fee + storage
- Profit = price − Amazon fees − product cost − inbound shipping − advertising
- Break-even ACoS = profit before advertising ÷ price
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Selling price | $29.99 |
| Product cost per unit | $8.00 |
| Inbound shipping per unit | $0.80 |
| Referral fee | 15% |
| FBA fulfilment fee per unit | $5.40 |
| Storage per unit sold | $0.15 |
| Advertising per unit sold | $2.00 |
| Result | Value |
|---|---|
| Profit per unit | $9.14 |
| Net margin | 30.5% |
| Return on product cost | 103.9% |
| Amazon fees per unit | $10.05 |
| Referral fee | $4.50 |
| Break-even ACoS | 37.2% |
How to read the result
Break-even ACoS is the advertising cost of sale at which a unit makes zero profit. Keep your target ACoS well below it.
Fulfilment fees jump between size tiers, so a small packaging change that drops a product into a smaller tier can add more profit than a price rise.
Marketplace fees change and vary by category and country. Check the platform’s current fee schedule before pricing.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
A referral fee, commonly around 15% in many categories, plus the FBA fulfilment fee per unit and storage fees if you use FBA.
Advertising cost of sale: ad spend divided by ad-attributed sales, as a percentage.
Many sellers aim for at least 20% net after all fees and advertising, but it depends on volume and competition.
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