Most sellers scale Amazon PPC without knowing the ACoS where profit hits zero. So they scale losses and never see it. Enter three numbers and find the ceiling every campaign has to stay under.
Break-even ACoS · target ACoS · pre-ad profit
Break-even ACoS is your pre-ad margin as a percent of sale price. Spend above it and every click loses money. Confirm your exact Amazon fees in Seller Central before scaling a campaign.
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Here's what happens to most sellers. They turn on ads, watch sales climb, and feel like it's working. The dashboard shows revenue going up and to the right, so they raise budgets and add campaigns.
Then the numbers settle and the profit isn't there. Their advertising cost of sale (ACoS) was quietly sitting above the point where the product still made money. Every extra dollar of ad spend was buying a sale that lost cash. They scaled the loss without ever seeing the ceiling.
That ceiling is your break-even ACoS. Spend that percentage of your price on ads and you net zero. You can't stay under a number you've never calculated. That's the whole reason this tool exists.
Sale price, landed cost, and Amazon fees per unit. Add a desired margin if you want a target, or leave it at zero.
The tool strips out cost and fees to get your pre-ad profit, then turns it into the ACoS where profit hits exactly zero.
Break-even ACoS for zero profit, and target ACoS to still keep the margin you picked. Compare both to your live campaigns.
Break-even ACoS is your pre-ad profit shown as a percentage of your sale price. Spend exactly that percentage of price on ads and you make zero dollars on that sale. Spend more and every click loses money. It's the ceiling every campaign has to stay under.
A good ACoS is any number below your break-even that still hits your profit goal. There's no universal figure. A product with fat margins can profit at 40 percent ACoS, while a thin-margin product bleeds at 20 percent. That's why you compare your live ACoS to your own break-even, not to someone else's.
Take your pre-ad profit per unit, subtract the profit dollars you want to keep, then divide by your sale price. That percentage is your target ACoS. This tool does it for you: enter a desired margin and it hands you the exact ACoS ceiling that still leaves that margin in your pocket.
Yes. Run it as many times as you want without an account. If you want the numbers emailed to you, drop your email and we send the breakdown over.
Break-even ACoS tells you the line. It doesn't tell you which wasted clicks and weak pages are pushing your real spend over that line. Our free Profit Audit maps the leaks in dollars, so you know exactly what to fix first.
Run My Free Profit Audit → Takes about 2 minutes. You get the exact fixes, not a sales pitch.