What is MER (Marketing Efficiency Ratio)?
MER (marketing efficiency ratio) is your total revenue divided by your total marketing spend, across all channels.
By Abdullah Ashraf · Last updated: October 2026
Example for a UK store
£20,000 of revenue from £4,000 of marketing gives a MER of 5.
Why it matters
It gives a big-picture view that doesn't rely on each platform's attribution.
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