Customers Retention Rate
The flip side of churn — and why a reassuringly high monthly rate still compounds into big annual losses.
What is it?
Customers Retention Rate is the percentage of paying customers you keep over a period — the exact flip side of customer churn rate. Start a month with 100 paying customers and end with 94 still paying, and your retention rate is 94%.
It looks reassuringly high, which is precisely its trap. A 94% monthly rate sounds like you keep almost everyone, but compounded across a year it means losing more than half your customers. Small movements in retention swing lifetime value and growth far more than their size suggests.
How to calculate?
Divide the customers retained through the period by the number you started with, excluding anyone who both signed up and churned inside the same period so you are measuring the existing base. Ninety of two hundred retained is a 95% rate.
Track it as a curve, not a single figure — retention by months-since-signup shows where in the lifecycle customers actually leave, which a blended rate hides completely.