Amazon FBA fee and profit calculator
Amazon charges an FBA seller two fees on every sale: a referral fee, a share of the price (15% in most categories), and a fulfillment fee set by the package's size tier and weight. Enter your price, box size and weight to see both, plus storage, ads and your profit per unit.
Profit per unit = selling price − referral fee − FBA fulfillment fee − storage − ads − landed cost
2026 US rate card, non-dangerous, non-apparel items. Free, no sign-up.
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Worked example
A 10 × 6 × 3 in box weighing 1.2 lb, selling at $24.99, is Large standard and pays the Large standard 1.5 lb fee step: $5.61 a unit ($5.93 in the holiday peak).
The referral fee at 15% is $3.75. 2 months of storage is $0.16 ($0.08 a month, $0.25 in October to December). Ads at 10% of sales are $2.50.
That leaves $12.97 before landed cost. With a landed cost of $6.00 a unit, profit is $6.97, a 27.89% margin.
Frequently asked questions
How are Amazon FBA fees calculated?
The fulfillment fee depends on the package's size tier and its shipping weight. The tier comes from the longest, middle and shortest side and the weight; above the smallest tier the shipping weight is the greater of the actual weight and the dimensional weight worked out from the box size. Each tier has weight brackets, and the fee for your bracket comes from the 2026 rate card plus a fuel and logistics surcharge.
What is the Amazon referral fee?
It is a share of the selling price that depends on the product category. Most categories charge 15%, which is what this calculator uses unless you enter your category's rate.
How much is FBA storage?
Amazon charges monthly storage per cubic foot of the package, and the rate is higher from October to December. The calculator shows both monthly figures for one unit and, if you enter the months a unit will sit in the warehouse, the storage cost for that time.
Why does the calculator show profit before landed cost?
Amazon's fees are only half of the cost. The factory price, freight, duty and import fees, together the landed cost, come before anything is sold. Enter your landed cost per unit to finish the profit, or work it out with the free landed cost calculator.
How can I pay a lower FBA fee?
Fees step up at each size tier and weight bracket. The calculator shows the nearest cheaper fee step and what it would take to reach it, such as a slightly shorter side or a lighter box, and the next dearer step with how much room you have before it.
Is this the official Amazon calculator?
No. It is an independent estimate from Cap Engine, which is not affiliated with Amazon. Confirm fees in Seller Central before you order stock.
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