Free calculator
ACoS calculator
Enter Amazon ad spend and attributed ad sales to get Advertising Cost of Sales — the inverse of ROAS, expressed as a percent.
How ACoS is calculated
ACoS = (ad spend ÷ ad-attributed sales) × 100. A 25% ACoS means you spent $0.25 in ads for every $1 of attributed ad sales — equivalent to 4× ROAS.
Break-even ACoS roughly equals your margin %. Thin-margin ASINs need lower ACoS (or higher organic lift) to stay profitable.
- ACoS % = (spend ÷ ad sales) × 100
- ROAS ≈ 100 ÷ ACoS %
- Compare ACoS to margin and TACoS for full picture
Frequently asked questions
What is ACoS?
Advertising Cost of Sales is ad spend as a percentage of ad-attributed sales. It is widely used on Amazon PPC as the inverse of ROAS.
How do you calculate ACoS?
Divide ad spend by ad sales, then multiply by 100. Example: $500 spend and $2,000 ad sales → ACoS = 25%.
What is a good ACoS?
Break-even ACoS is near your product margin. Below that, ads contribute to profit (before fees). Launch phases may tolerate higher ACoS for rank; mature ASINs usually need tighter targets.
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$119For multi-store teams with advanced Google Ads
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$149/ month
$199For agencies and high-volume merchants
- Up to 6 connected stores (all platforms)
- 15,000 orders / month included
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- Merchant Center XML feed
- Automatic order backup (stale stores)
- WooCommerce, Shopify, BigCommerce, PrestaShop, Shopware & OpenCart
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- Smart product labels (Google Ads)
- AI Agent POAS optimization
- Unlimited ad platforms
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