CRR vs MER
CRR (Customer Retention Rate) and MER (Marketing Efficiency Ratio) both come up in business conversations and get confused. Here's the plain-English difference, side by side, so you can use each one with confidence.
The key difference: CRR refers to customer retention rate, while MER refers to marketing efficiency ratio — they describe different things even when they show up in the same sentence.
CRR — Customer Retention Rate
The percentage of customers you keep over a period. The quietest growth lever in the business — retention compounds; acquisition just refills the bucket.
MER — Marketing Efficiency Ratio
Total revenue divided by total marketing spend. Unlike ROAS, MER captures blended performance across every channel — the number a CFO actually trusts.
When to use CRR
Reach for "CRR" when the conversation is specifically about customer retention rate. The percentage of customers you keep over a period. The quietest growth lever in the business — retention compounds; acquisition just refills the bucket.
When to use MER
Reach for "MER" when the conversation is specifically about marketing efficiency ratio. Total revenue divided by total marketing spend. Unlike ROAS, MER captures blended performance across every channel — the number a CFO actually trusts.
FAQs
What is the difference between CRR and MER?
CRR stands for Customer Retention Rate — The percentage of customers you keep over a period. The quietest growth lever in the business — retention compounds; acquisition just refills the bucket. MER stands for Marketing Efficiency Ratio — Total revenue divided by total marketing spend. Unlike ROAS, MER captures blended performance across every channel — the number a CFO actually trusts.
Are CRR and MER the same thing?
No. They're often used in the same conversation because they're related, but they describe different concepts. CRR = Customer Retention Rate. MER = Marketing Efficiency Ratio.
When should I use CRR vs MER?
Use CRR when you're specifically referring to customer retention rate. Use MER when the topic is marketing efficiency ratio.