Free Amazon PPC Bid Calculator
Knowing your break-even ACoS is the difference between scaling profitably and losing money on every click. Enter your price, costs, conversion rate, and target ACoS — we'll compute your max profitable bid and your target bid for healthy margin growth.
Referral + FBA. Use the FBA calculator if unsure.
Your goal. Lower than break-even = profit. Higher = buying ranking.
Above this and you lose money on the click. Gross profit per sale: $8.99.
Highest CPC at which you break even at your conversion rate.
Bid to hit your target ACoS of 25% at your conversion rate.
Three steps.
Zero friction.
- 01
Enter selling price, product cost, and Amazon fees (referral + FBA).
- 02
Enter your historical conversion rate (Seller Central → Reports → Business Reports).
- 03
Enter your target ACoS — lower than break-even = profit, higher = customer acquisition.
Why a wrong bid bleeds an Amazon account in 48 hours
Amazon PPC is a second-price auction with auto-bid suggestions that are almost always too high. Sellers who accept Amazon's "suggested bid" without doing this math routinely run 60-80% ACoS on launch campaigns — sometimes profitable for ranking, usually not.
The math is simple: your break-even ACoS is your gross profit margin. If a $24.99 product costs $8.50 to make and $7.50 in Amazon fees, your gross profit is $8.99 — 36% margin, so 36% break-even ACoS. Spend less than that on ads per sale and you're profitable. Max bid = price × conversion rate × target ACoS — if CR is 10% and target ACoS is 25%, your max bid is $24.99 × 10% × 25% = $0.62.
Bid higher than break-even only when you're buying ranking (launch phase, post-stock return, seasonal). The moment ranking is achieved, drop bids toward target ACoS or organic sales will start to subsidize your ad losses.
Frequently asked questions
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