What Amazon's calculator does
Amazon describes its Revenue Calculator as a way to compare fulfillment by Amazon against your own fulfillment: you either search the Amazon catalog for a product or define one with dimensions, weight, category, price and shipping, then adjust the costs for each method. It lives at sellercentral.amazon.com/revcalpublic.
Its big advantage: for a product already on Amazon it can use the dimensions and fee category Amazon has on file, which no outside tool can see.
Where an independent calculator helps
- Explaining the number. Amazon shows the fee; we show the tier, the weight row, the price band, the surcharge and the peak increment as separate lines, with a source for each.
- Dates. You can set a ship date and see peak and non-peak fees for the same unit.
- What-ifs. The fee-cliff check tests nearby weights, box sizes and prices and reports what each is worth per unit.
- Full unit economics. Advertising as a share of sales, returns, a target ROI and a break-even price, kept in a shareable link.
Amazon itself says its calculator's figures are estimates and not guaranteed. Moderators on Amazon's seller forums have repeated this when sellers asked about discrepancies. Ours are estimates too.
A workflow that uses both
- Sourcing: model the product here with your supplier's carton and unit dimensions. Test box sizes and prices.
- Before you order: if a similar ASIN exists, check its fees in Amazon's calculator as a sanity check.
- After the first inbound: compare with the fees Amazon actually charges (the Fee Preview report) and fix your inputs.
How we test our numbers
Our fee engine has automated tests built from Amazon's own published examples (a phone case, a baby cot and a TV from Amazon's 2026 peak fee notice) and from independent copies of the rate card. The full list is on the methodology page.