What is blended ROAS?
Nicklas Segatz Mortensen · Growth Hacker · Fractional CMO · Meta Ads Nerd · 8 July 2026 · 4 min.
Definition
Blended ROAS is your total revenue divided by your total ad spend across every channel. Unlike platform ROAS, it isn't built on attribution and therefore can't be double-counted.
Also called: Blended ROAS, aROAS, Total ROAS
Sådan virker det
Hver platform tilskriver sig de samme salg — lagt sammen bliver det 130 % af den faktiske omsætning. MER ignorerer attribution og måler den samlede omsætning mod det samlede forbrug.
01Why blended beats platform ROAS
Each platform credits itself with the same sales using its own generous windows, so the sum of Meta's, Google's and TikTok's reported ROAS describes a revenue larger than what actually came in. Blended ROAS ignores all attribution and looks only at the total: what came in, and what it cost.
Blended ROAS is closely related to MER — the difference is mostly whether the denominator is all marketing spend (MER) or only ad spend (blended ROAS). The point is the same: measure efficiency at a level no single platform can inflate.
02Blended as a scaling compass
Its great strength is as a scaling test. Turn the budget up and watch blended ROAS: if it holds or rises, the growth was incremental. If it falls while the platform numbers still look great, you bought sales you'd have gotten anyway.
We steer by blended/MER at the top and use POAS and contribution margin to distribute the budget within. One tells you whether the machine as a whole is making money; the other, where inside the machine the euros should go.
Frequently asked questions
What's the difference between blended ROAS and MER?+
Almost none — both measure the total without attribution. Blended ROAS typically has only ad spend in the denominator, while MER often counts all marketing spend (tools, agency). Neither can be inflated by a single platform.
Why is my blended ROAS lower than the platforms'?+
Because the platforms double-count: each credits itself with the same sales. The blended reality — total revenue against total spend — is almost always lower, and it's the one that matches the money in the bank.
Related terms
Glossary
What is MER?
MER (Marketing Efficiency Ratio) is your total revenue divided by your total marketing spend across every channel. It ignores the platforms' own attribution and shows how efficiently the whole marketing machine is working.
Read the entry →Glossary
What is ROAS?
ROAS (Return on Ad Spend) is the revenue generated by ads divided by ad spend. A ROAS of 4 means €4 in revenue for every ad euro — but says nothing about what you actually keep.
Read the entry →Glossary
What is attribution?
Attribution is the method that distributes the credit for a conversion across the touchpoints the customer met along the way. The model decides which channel gets the credit — and therefore where budget flows.
Read the entry →Glossary
What is incrementality?
Incrementality is the added effect a marketing effort creates: the sales that happened only because the ad ran. Sales you'd have gotten anyway aren't incremental — whatever the platform credits.
Read the entry →
Nicklas Segatz Mortensen
Growth Hacker · Fractional CMO · Meta Ads Nerd at Oaksmond
Growth hacker and fractional CMO with 10+ years' experience and hundreds of millions in managed ad spend behind him. Background from larger Danish and international scale-ups, and from the agency world.
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