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What is ROAS (Return on Ad Spend)? 

In short: ROAS is ad-attributed sales divided by ad spend. It's the inverse of ACoS.

Formula: ROAS = ad sales ÷ ad spend. A 25% ACoS equals a 4x ROAS.

Walmart Connect and TikTok GMV Max report in ROAS; Amazon Sponsored Ads usually report ACoS.

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