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How to calculate Blended ROAS and MER (Marketing Efficiency Ratio) across omnichannel paid media budgets?

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Edited by Aravind Patel · Aug 24, 2026 7:39 AM

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Title snapshot

How to calculate Blended ROAS and MER (Marketing Efficiency Ratio) across omnichannel paid media budgets?

Summary snapshot
Evaluating total top-line revenue divided by total paid ad spend across all ad networks.
Content snapshot
### MER Metric Formula `MER = Total Revenue / Total Paid Ad Spend`. Use MER as the primary North Star metric to avoid double-counting attribution across Meta and Google Ads.
Source snapshot

https://developers.google.com/search/docs

Version 1 (Original Post)

Published by Aravind Patel · Aug 9, 2026 5:37 AM

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Post originally created and published to the Global Hub.

Original Title

How to calculate Blended ROAS and MER (Marketing Efficiency Ratio) across omnichannel paid media budgets?

Original Summary
Evaluating total top-line revenue divided by total paid ad spend across all ad networks.
Original Content
### MER Metric Formula `MER = Total Revenue / Total Paid Ad Spend`. Use MER as the primary North Star metric to avoid double-counting attribution across Meta and Google Ads.
Original Sources

https://developers.google.com/search/docs