Blended ROAS
Also: Blended return on ad spend
Blended ROAS is total business revenue divided by total ad spend across every channel, measured against revenue you actually recorded rather than what each platform claims. It is the same ratio as MER.
Blended ROAS = Total revenue (all sources) ÷ Total ad spend (all networks)
The point of blending is to remove double counting. A single purchase can be claimed by Meta, Google, and TikTok at once because their attribution windows overlap. Summing platform revenue therefore overstates what you earned; dividing real revenue by real spend does not.
Blended ROAS tells you whether the marketing program as a whole is profitable. It does not tell you which channel to cut — for that you still need per-channel signal, ideally anchored to store-verified revenue by install cohort rather than to platform postbacks.
Common mistake
Treating a monthly blended ROAS as a verdict on a subscription app. Revenue from March installs keeps arriving in April and May; use a cohort window instead.
Go deeper: Blended ROAS calculator
Related terms
In Roasy
Roasy computes this across every ad network, Adjust, and RevenueCat on one screen — real revenue, cohort windows, and the same definition everywhere.