Amazon FBA Fee Calculator
The Amazon FBA fee calculator shows what each unit really earns once Amazon takes its referral fee, fulfilment fee and storage, and once you subtract product cost, shipping to Amazon and advertising. You get profit per unit, margin, ROI and the lowest price you can sell at without losing money.
What Amazon charges FBA sellers
- Referral fee: a percentage of the selling price, commonly 15% for most categories (8% for some electronics, up to 45% for Amazon Device accessories).
- Fulfilment (FBA) fee: a per-unit fee based on size and weight. Look up your product in Seller Central’s fee tool and enter it here.
- Storage fees: monthly, per cubic foot, higher in October to December.
- Other: inbound placement, returns processing, long-term storage and advertising.
The formula
Profit per unit = selling price − referral fee − FBA fee − storage − product cost − inbound shipping − ad cost per unit. Margin = profit ÷ selling price. ROI = profit ÷ total cost you put in per unit.
Questions people ask
What is a good FBA margin?
Many sellers aim for at least 25% to 30% net margin and 100% ROI, which leaves room for returns, price drops and ad costs.
Why include advertising per unit?
Most new products rely on ads. Dividing ad spend by units sold shows whether the product is profitable once launched.
Are returns included?
Not automatically. Add a return allowance to the ad or product cost fields if your category has high returns.