MaverickX
    Search Engine Marketing·7 min read

    Understanding Key Amazon Ad Metrics: ACoS, TACoS, and ROAS Explained

    ACoS, TACoS, and ROAS are the three pillars of Amazon advertising measurement.

    MaverickX Team·Mar 17, 2025
    ME
    MaverickX Editorial TeamMarketplace Growth Editors

    The MaverickX editorial team has managed over $2B in Amazon and Walmart marketplace sales since 2011. Coverage spans publisher partnerships, attribution, off-site traffic, and performance-based growth for DTC and enterprise brands.

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    Understanding Key Amazon Ad Metrics: ACoS, TACoS, and ROAS Explained — featured image for MaverickX Search Engine Marketing blog article

    ACoS: Advertising Cost of Sales

    ACoS = (Ad Spend / Ad Revenue) × 100. Lower ACoS = more efficient advertising.

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    TACoS: Total Advertising Cost of Sales

    Includes organic sales. Declining TACoS indicates growing organic strength.

    ROAS: Return on Ad Spend

    Inverse of ACoS. ROAS of 4:1 means $4 revenue per $1 spent.

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    Strategic Application

    Use ACoS for daily optimization, ROAS for cross-platform, TACoS for monthly business health.

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