Free tool
MER calculator
Marketing efficiency ratio: total store revenue divided by total marketing spend, across every channel — no attribution model involved.
For the period you're measuring — not just ad-attributed revenue.
Meta, Google, and any other paid channel combined.
MER
6.25x
How this is calculated
MER is total revenue ÷ total marketing spend. Unlike ROAS, it doesn't rely on any platform crediting specific orders to specific ads — which makes it steadier, but less useful for comparing individual campaigns. See MER vs ROAS for when to use which.