Marketing Efficiency Ratio Calculator
Marketing efficiency ratio (MER) compares the revenue attributed to marketing with the marketing spend included in the same reporting period.
How to use this calculator
- Enter revenue attributed to marketing, total marketing spend; check the units and use values from the same period or scenario.
- Review the result and intermediate values; change one input at a time when comparing scenarios.
- Keep the stated formula and assumptions with any result you share.
Formula and method
MER = attributable revenue ÷ marketing spend. A value of 4.0 means €4 revenue per €1 of marketing spend.
- MER is 4.0×, or €4 of attributed revenue per €1 spent.
- Revenue attribution can be incomplete or double-counted across channels. MER is not profit and does not establish causation.
Worked examples
Worked example
€24,000 revenue against €6,000 of marketing spend.
MER is 4.0×, or €4 of attributed revenue per €1 spent.
MER is 4.0×, or €4 of attributed revenue per €1 spent.
Understanding the result
MER is 4.0×, or €4 of attributed revenue per €1 spent.
Revenue attribution can be incomplete or double-counted across channels. MER is not profit and does not establish causation.
Important notes
Revenue attribution can be incomplete or double-counted across channels. MER is not profit and does not establish causation.
Use measured inputs and verify that the model matches the situation before making an operational, financial or technical decision.
Frequently asked questions
Is MER the same as ROAS?
Definitions vary; MER often uses wider total marketing spend while ROAS may use one campaign or channel.
Does a high MER guarantee profitability?
No. Include cost of goods, service, refunds, fixed costs and attribution quality.
What should I check before relying on this result?
Verify units, input definitions and assumptions against your real data or the relevant product, service or professional guidance.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate Percent Error — Learn the percent error formula and how to compare an experimental value with a reference or accepted value.
- How to Calculate Break-Even Point — Learn the break-even formula for units and revenue and understand fixed costs, price, and variable costs.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.