MER (Marketing Efficiency Ratio)

Metric

MER is total company revenue divided by total marketing spend across all channels, measured as a holistic, attribution-free efficiency metric.

Layman Explanation & Analogy

Also called "Blended ROAS", MER is the high-level financial health check of your marketing. Instead of arguing over whether Google or Facebook deserves credit for a sale, MER takes all the money your company made in a month and divides it by all the money you spent on all ads combined.

Mathematical Formula

MER = Total Company Revenue ÷ Total Marketing Spend

Worked real-world example

If your store made $100,000 in total sales this month and spent $20,000 across Google, Meta, TikTok, and influencer sponsorships combined, your MER is $100,000 ÷ $20,000 = 5.0 (or 5x).

What people get wrong & common traps

MER gives you the big picture, but it cannot tell you which specific campaign or creative is performing well or poorly. Use MER to set macro ad budgets and ensure overall business profitability, while using channel metrics underneath it for day-to-day tactical tweaks.

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