What is Blended ROAS?

Blended ROAS sits between platform ROAS and MER. Like MER it starts from real total revenue, but it divides by advertising spend specifically rather than all marketing cost, which makes it the practical number for a brand whose growth is essentially paid-media driven.

It exists because per-platform figures double count. Ask Meta and Google each what they earned and their answers will sum to more than the business took, because both legitimately claim purchases they contributed to. Blended ROAS refuses to play that game and reports one number that reconciles with the bank.

Use it as the steering figure and set a floor for it before you scale. In the Meta ads accounts we manage we decide the acceptable floor first, then push spend until we approach it, rather than chasing a peak and being surprised when it falls. Scaling always costs some efficiency; deciding in advance how much you are willing to pay for volume turns that into a decision rather than a nasty surprise three weeks later.