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MER (Marketing Efficiency Ratio) measures what percentage of your total revenue is spent on advertising—lower is better.

Formula

Marketing Efficiency Ratio = ( Total Ad Spend ÷ Total Revenue ) × 100

Formula Components


Example

Your store generated $250,000 in order revenue while spending $50,000 on ads: A 20% MER means you spent $0.20 on ads for every $1.00 of revenue. Lower MER indicates better efficiency—you’re keeping more of each revenue dollar.

How It Works

MER divides your total advertising spend by your total order revenue, then multiplies by 100 to express it as a percentage. Unlike ROAS (which is Revenue ÷ Spend), MER shows the inverse—what fraction of your revenue goes to advertising. Lower MER values indicate better efficiency.

When to Use


See all Performance metrics →