Seller Central reports revenue. This works out the number underneath it — net profit per unit after referral fees, FBA, returns, storage and advertising, plus the break-even ACoS your campaigns need to stay above.
Everything runs in your browser. Use figures from your own Seller Central fee preview and settlement reports for an accurate result.
Your break-even ACoS is the point where an advertised sale earns you nothing. Spend above it and every additional order makes you poorer, however good the revenue chart looks.
Contribution per unit is the selling price minus everything Amazon and your supply chain take: referral fee, FBA fulfilment, storage, landed product cost, the cost of returns, and any per-unit extras. That figure — before advertising — divided by the selling price is your break-even ACoS.
Advertising is then applied against the share of orders that actually come from ads, rather than against every order, because organic sales carry no ad cost. That is why blended profitability and ACoS tell you different things, and why TACoS matters more than ACoS once organic share grows.
This calculator handles one product. The free audit rebuilds your whole catalogue into net profit per ASIN, which is usually where the loss-making products turn up.
Not ready to hand over access? Send one question about your account instead — ask without booking anything. Or read the numbers first on client results.