Free Amazon ACoS Calculator
Turn your Amazon ad numbers into ACoS, TACoS and ROAS, then see your break-even ACoS, a target ACoS for the profit you want and the highest CPC bid you can afford.
Amazon ACoS Calculator: Turn your Amazon ad numbers into ACoS, TACoS and ROAS, then see your break-even ACoS, a target ACoS for the profit you want and the highest CPC bid you can afford. It is free, needs no sign-up and runs in your browser. How to use it: 1) enter ad spend and ad sales from Campaign Manager, plus total sales, clicks and orders if you have them; 2) enter your price and costs, or just your profit margin before ads, and the margin you want after ads; 3) press Calculate to see each metric explained, your status against break-even and a bid guide by target ACoS. The calculator uses the standard Amazon Advertising formulas with your own numbers. Nothing is estimated from outside data.
How the Amazon ACoS calculator works
The calculator uses the standard Amazon Advertising formulas with your own numbers. Nothing is estimated from outside data. It runs in your browser, works offline in the Hayyat Networks app and remembers your last inputs on this device.
Formulas
- ACoS = ad spend / ad sales x 100
- ROAS = ad sales / ad spend, which is 100 / ACoS
- TACoS = ad spend / total sales (ads plus organic) x 100
- Break-even ACoS = profit margin before ads = (price – product cost – referral fee – FBA fee – other costs) / price
- Target ACoS = break-even ACoS – the profit margin you want after ads
- Max CPC bid = price x conversion rate x target ACoS
Example: $250 spend and $1,000 ad sales give a 25% ACoS and 4x ROAS. A $25 product with a 37% margin before ads breaks even at 37% ACoS. With a 10% profit goal the target is 27%, and at an 8% conversion rate the max bid is $25 x 0.08 x 0.27 = $0.54.
The referral fee defaults to 15% with a $0.30 minimum, as for most categories. Enter an FBA fee that includes the 3.5% fuel and logistics surcharge. Defaults checked November 2026; confirm in your seller dashboard.
Limitations
Amazon attributes ad sales over a 7 or 14 day window, so short date ranges can understate sales. Conversion rates vary by keyword, so treat bids as a starting point. This is a planning estimate, not financial advice. Not affiliated with Etsy, Amazon, eBay or Walmart.
About this tool
The Amazon ACoS Calculator is built and maintained by the Hayyat Networks team, a digital marketing, SEO and web development agency working with businesses in New York and Lahore since 2016. It is part of our free Marketplace Seller Tools collection.
- Last reviewed
- CostFree, no sign-up
- Where it runsRuns in your browser
- Checking resultsThe method and a worked example are shown above, so you can verify every result.
- PrivacyIt runs entirely in your browser: what you type stays on your device and is never sent to us.
Spotted a problem or have an idea? Tell us and we will review it.
Link to this tool
Free to share in your blog, course notes or resource list. Copy the link below:
<a href="https://hayyatnetworks.com/free-tools/marketplace-seller-tools/amazon-acos-calculator/">Amazon ACoS Calculator</a> by Hayyat NetworksAmazon ACoS Calculator FAQs
What is a good ACoS on Amazon?
A good ACoS is one below your break-even ACoS, which equals your profit margin before ads. If your margin is 35%, any ACoS under 35% makes money on ad sales. Many sellers aim several points lower to keep profit, and accept a higher ACoS for a short time when launching a product.
What is the difference between ACoS and TACoS?
ACoS divides ad spend by ad sales only. TACoS divides the same ad spend by total sales, including organic orders. ACoS shows how efficient your campaigns are, while TACoS shows how much the whole business depends on ads. A falling TACoS usually means organic rank and sales are growing.
How do I calculate break-even ACoS?
Take your selling price and subtract product cost, the Amazon referral fee, the FBA or shipping fee and other per-unit costs. Divide that profit by the price. For a $25 item with $9.25 profit before ads, break-even ACoS is 37%. Above that, each ad sale loses money.
How much should I bid per click on Amazon?
Multiply your price by your conversion rate and your target ACoS. A $25 product that converts 8% of clicks with a 27% target ACoS supports a bid of about $0.54. Bidding above your break-even CPC means every click costs more than the profit it brings in on average.
Want our experts to implement these improvements?
Get professional support from Hayyat Networks. Request a free consultation.
Want experts to handle this?
More free marketplace seller tools
Free audit and all tools
Keep exploring
More tools in this category
Other tool categories
Get expert help
Marketplace fee calculators
Work out exact fees and profit for one marketplace at a time with these free calculators.