Glossary

What is ACoS?

ACoS stands for Advertising Cost of Sales.

Last updated: June 2026

ACoS — Advertising Cost of Sales
ACoS (Advertising Cost of Sales) = ad spend ÷ ad revenue × 100. It measures how much you spend on Amazon ads to make one rupee (or dollar) of ad-attributed sales. Lower is more efficient; your break-even ACoS equals your profit margin.

In depth

ACoS is the headline efficiency metric for Amazon Sponsored Products. An ACoS of 25% means you spent ₹25 in ads for every ₹100 of ad-attributed revenue. It only counts sales Amazon attributes to a click — not organic sales the ad helped drive (that is TACoS). Your break-even ACoS is your contribution margin: if you keep 30% after product cost and fees, an ACoS above 30% loses money on that ad sale, below 30% profits.

How AIAdKing handles ACoS

AIAdKing moves each bid toward your target ACoS every night — trimming bids on losing search terms, harvesting non-converting terms as negatives, and concentrating spend where it converts — so ACoS falls without you touching Seller Central by hand.

Related terms

TACoS RoAS Negative keywords All terms →

ACoS — quick answers

What is ACoS (Advertising Cost of Sales)?
ACoS (Advertising Cost of Sales) = ad spend ÷ ad revenue × 100. It measures how much you spend on Amazon ads to make one rupee (or dollar) of ad-attributed sales. Lower is more efficient; your break-even ACoS equals your profit margin.

How does AIAdKing handle ACoS?
AIAdKing moves each bid toward your target ACoS every night — trimming bids on losing search terms, harvesting non-converting terms as negatives, and concentrating spend where it converts — so ACoS falls without you touching Seller Central by hand.

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