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What is MER?

Finance

Marketing Efficiency Ratio. Total revenue ÷ total ad spend across ALL channels. More accurate than ROAS because it accounts for email revenue, organic, SMS, and repeat buyers — not just the last ad clicked. A business with a 2.5× MER may show a 4× Meta ROAS because email is recovering 30% of revenue at near-zero cost.

Optimizing Meta ROAS in isolation once you have multiple revenue channels. A campaign may look unprofitable in Ads Manager but be driving email list signups that convert at 3× through your Klaviyo flows. MER catches this; platform ROAS doesn't.

Learn this in practice → Cash Flow Basics

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