MER
Also called blended ROAS
By the AdFlint research team · Last reviewed July 2026
Total company revenue divided by total marketing spend across all channels, a blended efficiency ratio rather than any per-campaign measurement.
It sidesteps attribution entirely by refusing to assign credit, asking only what every marketing dollar coincided with in revenue. That makes it stable when tracking degrades, but blunt: it also moves with organic demand, email, retention, and seasonality. The common misreading is diagnosing a single channel from it, which by construction it cannot tell you anything about.
MER compared with
The settings this gets confused with, and how to tell them apart.
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