Collect the matching inputs.
Include all channels and the agreed scope of marketing costs. Use net revenue consistently and monitor both weekly movement and longer periods that absorb buying delays.
← All ecommerce KPIs
Acquisition · MERMarketing efficiency ratio.
Marketing efficiency ratio.
Put total marketing spend in context.
Marketing efficiency ratio divides total business revenue by total marketing spend for the same period. This guide uses revenue divided by spend, where a higher ratio means more revenue per marketing euro.
Start with your numbers.
MER calculator
01 / The definitionWhat is
What is
marketing efficiency ratio?
Marketing efficiency ratio divides total business revenue by total marketing spend for the same period. This guide uses revenue divided by spend, where a higher ratio means more revenue per marketing euro.
Some teams call spend divided by revenue MER. That inverse would be 20% in this example. MER includes organic and repeat sales and is not causal return on marketing.
02 / The measurementA clear formula.
A clear formula.
A useful comparison.
MER =Total net revenue ÷ Total marketing spend
Read the result in context.
Establish your own seasonal baseline and compare with contribution margin. Fast acquisition growth may lower current MER while building future repeat revenue.
Document the comparison.
Keep the reporting dates, population, exclusions and calculation with every result. Show underlying counts as well as the average or rate, so a small sample does not look more conclusive than it is.
Illustrative example
From inputs to insight.
- Total net revenue
- 100,000
- Total marketing spend
- 20,000
- MER
- 5×
5× MER: €5 of total net revenue per €1 of marketing spend.
Try your numbers ↑03 / Industry benchmarksContext first.
Context first.
Targets second.
Establish your own seasonal baseline and compare with contribution margin. Fast acquisition growth may lower current MER while building future repeat revenue.
We have not verified a public industry benchmark that matches the exact definition used on this page. A precise-looking generic range would hide important differences between businesses.
Build your own benchmark
Start with a comparable baseline.
01
Match the population.
Choose the category, channel or customer cohort you can compare consistently.
02
Let the data mature.
Use complete periods and allow the purchase, attribution or returns window in your definition to close.
03
Test a specific opportunity.
Set a target from your economics and observed variation. Keep conversion and contribution in view.
04 / Clerk customer evidenceReal stories.
Real stories.
Clear measurement limits.
We have not verified a published Clerk customer case with a quantified marketing efficiency ratio result matching this page’s definition.
What would count as useful evidence?
A case reporting total net revenue and total marketing spend, with the time window and comparison method. General revenue growth or a related engagement metric does not establish this result.
Customer stories describe individual implementations. They are not industry benchmarks, guarantees or standardized causal tests.
05 / Put it into practice
Put total marketing spend in context.
Use blended efficiency to monitor the business, then investigate individual channels without summing overlapping attributed revenue.
06 / Common questionsA little more
A little more
clarity.
How do I calculate marketing efficiency ratio?
Total net revenue ÷ Total marketing spend. 5× MER: €5 of total net revenue per €1 of marketing spend.
What should I check before comparing results?
Some teams call spend divided by revenue MER. That inverse would be 20% in this example. MER includes organic and repeat sales and is not causal return on marketing.
What is a good marketing efficiency ratio?
Establish your own seasonal baseline and compare with contribution margin. Fast acquisition growth may lower current MER while building future repeat revenue.
Does a higher attributed result prove incremental growth?
No. Attribution connects an interaction with an outcome under a reporting rule. To estimate what a change added, compare randomly assigned treatment and control groups using the same eligible population and a predefined measurement window.
Keep learning
Connect the numbers.
Your next opportunityMake product discovery
Make product discovery
work harder for your store.
Explore how Clerk helps shoppers find relevant products throughout their journey.