Customer Churn and Retention Calculator
Track how much of your opening customer cohort you retained during one period.
Your numbers
Example values are prefilled. Use the same reporting period for all inputs.
Customer churn rate
5%
Starting-cohort retention rate
95%
Retained starting customers
950
Customers at period end
1,070
The formula
Churn = Lost starting customers / Starting customers × 100; Retention = 100 − Churn; Ending customers = Starting − Lost + New still active.
Worked example
Of 1,000 starting customers, 50 leave: 5% churn and 95% retention. With 120 new customers still active, the ending customer count is 1,070.