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Break-even ACoS & Max Bid Calculator
Know exactly how much you can pay per click on Amazon and still make money. Get your break-even ACoS, a target ACoS for the profit you want, and the maximum bid for your conversion rate.
Your results
Enter a price and a profit before ads that is smaller than the price.
- Margin before ads—
- Break-even ROAS—
- Target ROAS—
- Break-even CPC—
- Max bid at target ACoS—
How it works
The three formulas behind every profitable bid
Example: a $30 product with $9 profit before ads has a 30% break-even ACoS. To keep 10% profit, your target ACoS is 20%. If 12% of clicks turn into orders, you can bid up to $30 × 0.12 × 0.20 = $0.72 per click.
How to use it
- Enter price and profit before ads. Profit before ads is what is left after Amazon fees, product cost and shipping.
- Choose the profit you want to keep. 0% means you are happy to break even on ad sales, which some sellers accept during a launch.
- Add your conversion rate from the Amazon Ads console (orders ÷ clicks).
- Compare with your current ACoS to see whether to raise or lower bids.
Frequently asked questions
What is break-even ACoS?
Break-even ACoS is the advertising cost of sale at which an ad-driven sale makes zero profit. It equals your profit per unit before ads divided by your selling price. A product priced at $30 with $9 profit before ads has a break-even ACoS of 30%.
What is a good ACoS on Amazon?
There is no single good ACoS. It depends on your margin. A good ACoS is below your break-even ACoS by enough to leave the profit you want. During a launch, sellers often run above break-even on purpose to build sales history and rank.
How do I calculate my maximum CPC bid?
Max bid = selling price x conversion rate x target ACoS. For a $30 product converting 12% of clicks with a 20% target ACoS, the max bid is $30 x 0.12 x 0.20 = $0.72.
What is the difference between ACoS and TACoS?
ACoS is ad spend divided by ad sales. TACoS is ad spend divided by total sales, organic plus ads. ACoS tells you if ads are profitable; TACoS tells you how dependent the whole business is on ads.
How do ACoS and ROAS relate?
They are the same ratio upside down. ROAS = 1 / ACoS. A 25% ACoS equals a 4.0x ROAS.
Where do I find my conversion rate?
In Amazon Ads, conversion rate is orders divided by clicks for the keyword or campaign. In Seller Central Business Reports, unit session percentage gives your overall listing conversion rate.
Bid by profit, not by guesswork
Sotrics tracks ACoS, TACoS and profit per product so you always know which campaigns make money.
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