Amazon FBA Profit Calculator
Calculate your true FBA net profit after all fees, fulfilment costs, and ad spend — per unit.
Calculator setup
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Core pricing
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Other
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Amazon Fees
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Advertising
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Specialist notes
The most accurate Amazon FBA profit calculator for sellers. Includes FBA size-tier fulfilment fees, referral fees, storage, PPC ad spend, and prep costs.
Always calculate profit BEFORE launch. Amazon's fees change — bookmark the Seller Central Fee Schedule and re-run this calculator quarterly.
ACoS (Advertising Cost of Sale) should always be below your gross margin. If your product has 30% gross margin, keep ACoS below 30% to remain profitable.
FBA size tiers dramatically affect fees. A product that crosses from Small Standard to Large Standard can cost $3–4 more per unit. Design or source products with FBA size tiers in mind.
Storage fees spike 3x in Q4 (Oct–Dec). Build this into your seasonal margin calculations and avoid overstocking slow movers before October.
Aim for at least 25–30% net margin on Amazon FBA after all fees. Anything below 15% makes you highly vulnerable to fee increases, returns, and price competition.
How to Calculate Amazon FBA Profit Accurately
Amazon FBA profit calculation requires accounting for multiple fee layers that most sellers underestimate. Beyond the referral fee (8–15% of sale price), FBA sellers pay fulfilment fees based on product size and weight, monthly storage fees that spike in Q4, inbound shipping to Amazon's warehouses, PPC advertising costs, and a returns rate that reduces effective revenue. Many sellers calculate gross margin but forget storage and advertising costs, which can silently erode profitability. This calculator accounts for all of these. A product with a 40% gross margin can easily drop to 15–20% net margin after FBA fees, ads, and storage — which is why running the numbers before launch is essential.