How is the FBA fulfillment fee calculated? Amazon assigns each product a size tier (Small Standard, Large Standard, Large Bulky, or Extra Large) based on its dimensions and weight. The fulfillment fee is then determined by that size tier and unit weight. This calculator applies Amazon's current US fee schedule automatically.
Enter your selling price, costs, and product dimensions. Get net profit, margin, ROI, size tier, and a full Amazon fee breakdown — instantly.
See your real profit — automatically, across every order
SellerGuards members connect via Amazon SP-API once. Every order gets automatically costed using FIFO inventory lots, giving you true per-order profit without any manual entry.
Amazon assigns each product a size tier (Small Standard, Large Standard, Large Bulky, or Extra Large) based on its dimensions and weight. The fulfillment fee is then determined by that size tier and unit weight. This calculator applies Amazon's current US fee schedule automatically.
What is the Amazon referral fee?
Amazon charges a referral fee on each sale, typically 8–20% depending on product category. Consumer Electronics pay 8%, Clothing pays 17%, and most categories pay 15%. The calculator auto-applies the rate when you select your category, and you can edit it manually.
What is ROI vs. margin?
Profit margin is net profit as a percentage of selling price — how much you keep of each dollar of revenue. ROI is net profit as a percentage of total cost to acquire and sell the unit — how efficiently your capital is working. A product might have 20% margin but 40% ROI depending on the cost structure.
Does this include FBA storage fees?
Yes. When you enter dimensions, the calculator estimates the monthly storage fee based on cubic footage and size tier. Toggle "Peak Season" to apply October–December rates, which are significantly higher than off-peak rates.
What is the break-even price?
The break-even price is the minimum selling price at which your net profit reaches exactly $0. It equals all your fixed costs plus Amazon fees at that price. Selling below this price means you lose money on every unit.