Blended MER Calculator
MER — marketing efficiency ratio — measures how hard your entire marketing budget works, across every channel, without the attribution headaches of per-channel ROAS.
Blended MER Calculator
All revenue in the period, every channel.
All paid media + marketing costs.
Total revenue is 4× your total marketing spend. Marketing is 25% of revenue.
MER = Total revenue ÷ Total marketing spend. Blended across all channels, so it captures halo effects ROAS misses.
Formula
MER = Total revenue ÷ Total marketing spend
MER is blended and channel-agnostic: all revenue over all marketing spend in a period. Because it doesn't rely on click attribution, it captures the halo and cross-channel effects that per-channel ROAS double-counts or misses entirely.
Worked example
In a month you do $120,000 in total revenue on $30,000 of total marketing spend. MER = 120,000 ÷ 30,000 = 4×. Marketing accounts for 25% of revenue.
What this tells you
As attribution has gotten less reliable, MER has become the metric finance and growth teams trust to judge whether marketing as a whole is paying off. It won’t tell you which channel drove a sale — that’s the trade-off — but it’s immune to the over-attribution that makes the sum of per-channel ROAS look better than reality. Most teams steer with MER at the top and use ROAS to allocate within it.
Benchmarks
MER and marketing-as-a-percent-of-revenue most teams run at.
| MER | Marketing % of revenue |
|---|---|
| 2× | 50% — aggressive growth / low margin |
| 3× | 33% — common DTC range |
| 4× | 25% — efficient |
| 5×+ | ≤20% — mature / high margin |
Directional ranges only — your targets depend on margins, business model, and stage.
Common mistakes
Comparing MER to ROAS one-to-one — MER is blended and always lower than summed ROAS.
Changing what counts as marketing spend month to month, breaking the trend.
Steering only by MER and losing the per-channel detail needed to allocate budget.
Reading a single month in isolation instead of the trend across periods.
When to use it
- Judging whether total marketing spend is paying off, attribution aside
- Setting a blended efficiency target the whole team steers toward
- Cross-checking when per-channel ROAS figures look too good to be true
FAQ
MER vs ROAS — which should I use?
Use both. ROAS is per-channel and attribution-dependent, good for allocating budget within marketing. MER is blended and attribution-free, good for judging whether total spend is efficient. MER is the more honest top-line number.
What is a good MER?
It varies by business model and margin, but many DTC brands target a MER of 3–4×. The right number is one that leaves enough contribution margin after marketing to hit your profit goals.
What counts as marketing spend in MER?
Typically all paid media plus the costs of running marketing — agency fees, creative, tools. Keep the definition consistent month to month so the trend is meaningful.
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