Most sellers set bids by vibes. The math takes ten seconds they never spend. Enter your price, margin, conversion rate, and target ACoS. Get the highest cost per click a keyword can pay and still stay profitable.
Max profitable bid · 3 ACoS scenarios
Max bid is the ceiling, not a target. Start below it and let the campaign settle. Any bid above your break-even line loses money on ad-driven sales.
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Here is the pattern we see in almost every audit. A seller opens Campaign Manager, sees a suggested bid of a dollar twenty, shrugs, and takes it. No math. No idea whether that keyword can carry that cost.
The truth is simpler than it feels. You pay per click, but you earn per sale, and only some clicks turn into sales. So the most you can bid depends on three things: your price, how many clicks it takes to make a sale, and how much of that sale you are willing to give to ads. Multiply target ACoS by price by conversion rate and you have your answer in ten seconds.
This calculator does that multiplication and shows you the ceiling before you overpay for it.
Price, margin, conversion rate, and the ACoS you want to hit. All from your own data.
Target ACoS times price times conversion rate gives the max cost per click your target can carry.
Max profitable bid, your break-even bid at margin, and the bid at three ACoS scenarios.
Multiply your target ACoS by your price and by your conversion rate. That gives the most you can pay per click and still hit your ACoS target. At a 30 dollar price, a 10 percent conversion rate, and a 25 percent target ACoS, your max bid is 75 cents per click.
Because you pay per click but earn per sale. If one in ten clicks converts, ten clicks fund one sale, so each click can only cost a tenth of what that sale can afford. A higher conversion rate lets you bid more for the same ACoS, which is why fixing your listing raises your affordable bid.
Use your break-even ACoS, which equals your profit margin, as the ceiling. To actually keep profit, set a target below it. Bidding at your margin breaks even, so a target a few points under your margin leaves real money after each sale.
Yes. Run it as many times as you want with no account. Drop your email only if you want the breakdown sent to your inbox.
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