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Marketing Efficiency Ratio Calculator

Total revenue divided by total marketing spend. The blended metric that exposes whether marketing is actually growing the business — not just hitting per-channel ROAS targets while bleeding margin.

Your numbers

Enter monthly totals

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Include paid media, marketing tools, agency fees and in-house marketing salaries. The fully-loaded number, not just ad spend.

Optional

%

Revenue minus COGS, divided by revenue. If unknown, leave blank.

Channel breakdown (optional)
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TikTok, LinkedIn, programmatic, etc.

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Result

Your MER

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Enter revenue and spend to calculate.

How to read this

There's no universal "good" MER.

Most published benchmarks claim ranges (3x for ecommerce, 5x for fashion, 2x for SaaS in growth). At Google, I saw extreme variation across businesses even within the same vertical. Industry averages muddy the facts — a CPG brand with 25% gross margin and a B2B SaaS company with 80% gross margin can't be evaluated on the same MER scale.

My recommendation is to identify your break-even MER using this calculator. This is your floor below which marketing is unprofitable. This should stem directly from your gross margin: MER floor = 1 / gross margin. If your gross margin is 40% (0.40), your break-even MER is 2.5x. If margins are 20%, you need MER above 5.0x to justify that marketing spend.

What MER doesn't tell you

  • Which channels are pulling weight versus dragging the average down
  • Whether revenue is coming from new customers or existing LTV
  • Lag effects — brand investment today shows up in MER three quarters later
  • Seasonality — December MER for ecommerce isn't comparable to February

Use MER as the top-line health check, then drill into ROAS, CAC and channel mix for the actual decisions.

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