Blended MER: the weekly number a beauty CEO should watch
November 26, 2026
Every channel hands you its own number. Meta reports ROAS, Amazon reports ACOS, Google reports conversions, and each one is graded by the platform selling you the ads. Add them up and the brand made more from marketing than it actually brought in.
Blended MER is total revenue divided by total marketing spend, across every channel. It's crude, and that's why it's useful.
Why we look at blended first
A shopper sees you on paid social a few times, searches your name on Amazon and buys there. Meta wants the credit, Amazon wants the credit, and both dashboards look great. Blended MER skips that argument and asks how much revenue came in for every dollar of marketing that went out.
When every channel dashboard improves and blended MER drops, the channels are claiming the same customers. When channel numbers look average and blended MER holds up, the channels are usually feeding each other in ways the pixels can't see. It's the simplest version of how we look at connected commerce: the whole account, one number.
Reading it without fooling yourself
- 01Watch the trend over the trailing 4 and 13 weeks. A healthy MER depends on your margins and growth stage, so the direction matters more than the level
- 02Mark the calendar. Prime Day, launches and the holidays move MER for reasons that have nothing to do with efficiency
- 03Pair it with new-to-brand. MER tells you how efficient the spend was, and new-to-brand tells you whether it's bringing in new customers
Where it goes in the weekly review
Put blended MER against plan at the top of the review, with what moved it underneath. It takes a few minutes, a CFO can read it without an attribution walkthrough, and every agency and channel owner is working from the same number.
The Takeaway
Start the weekly review with blended MER against plan, then let the channel numbers explain it.
Navigo / Beauty, Only Beauty
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