Article

ROAS vs MER vs Blended CAC: Which Metric Actually Matters

Eightx Free Intermediate

Lays out a clean cadence for which metric to look at on which day: ROAS for daily creative calls, MER for the weekly budget conversation, blended CAC for the quarterly growth call, so one number stops trying to answer three different questions.

  • Platform reported ROAS is described as systemically inflated post iOS 14, treat it as a tactical, not strategic, number.
  • Recommends an LTV to CAC ratio of 3 to 1 or better before scaling acquisition spend.
  • Ties everything back to contribution margin after variable marketing costs (CM3) as the real constraint, targeting 20 to 25%.
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The question it answers

  1. Which Meta Ads Manager metrics actually matter, and how do I read them?

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