Paste your settlement or payments report and see what Amazon actually deducted: real per-unit fees, your measured referral rate, and the break-even ACoS your ads should be judged against. Free, no signup.
Three numbers in, three decisions out. If you don't know your real fees per unit, the fee checker below reads them from your own report.
Fees = referral + fulfilment (+ per-unit storage if you track it). From the settled numbers, not the fee preview — the two disagree more often than you'd think.
Reads the Date Range transaction report (Payments → Reports Repository → CSV) or the V2 settlement flat file (.txt). English-header marketplaces.
Privacy: this page has no upload endpoint. Parsing happens in your browser — check the network tab while you use it, or read the page source.
A step between months usually means Amazon changed your rate — or your category — without telling you.
| Month | Units | Product sales | Referral % | FBA / unit |
|---|
| Line | Amount | % of sales |
|---|
The method behind this tool, learned on our own account.
Every fee calculator — including Amazon's own preview — returns an estimate. The settlement file records what Amazon actually deducted, order by order, fee line by fee line. On our account the estimate ran about $0.70 per unit kinder than the settled truth. Price your ads against the kind number and every campaign looks better than it is.
Worse: fees move and nothing tells you. In July our referral rate went from ~5.6% to ~12.6% overnight — no notification, no dashboard change. For a month every bid was priced against a break-even that no longer existed. The by-month table above exists because of that month.
Two traps if you ever do this by hand in a spreadsheet: in the V2 flat file, filter on amount-type and amount-description together — "Principal" alone matches both the item price row and the negative promotion row, which double-counts units and manufactures a plausible-but-wrong referral rate. And check multi-unit orders separately: Amazon writes them in two valid shapes, and one of them quietly collapses everything past the first unit.
What this page deliberately does not do: it never estimates. Ad spend is billed outside settlements, so it isn't here. COGS is yours, so it isn't here. What's left is the one thing a dashboard can't give you — the measured number.
No. The file is parsed by JavaScript in your browser. This site has no upload endpoint — verify it in your browser's network tab while using the checker.
The Date Range transaction report CSV (Seller Central → Payments → Reports Repository) and the V2 settlement flat file (tab-separated .txt). Headers must be in English — US, UK, CA and AU marketplaces are fine.
Category reassignment, a promotional rate expiring, VAT interactions on some marketplaces, or a plain rate change. The by-month view shows when it moved, which is the first step to finding out why.
No — Amazon bills advertising outside the settlement, so it can't be measured from this file. Judge ads against the break-even ACoS above, using your ads console spend.
An Amazon seller (AU/US/CA) who got burned by a silent referral-rate change and started re-measuring fees from settlement line items on a schedule. The longer-form tooling lives at agentxray.ai.