doomath Calculator
Customer Churn Rate Calculator
Calculate customer churn rate and the corresponding retention rate for a period.
InputsChange a value to recalculate instantly
ResultUpdates as you type
How it worksTransparent math
Calculation details are shown above.
Result breakdownSee the important numbers together
1Customer churn rate5%
λ DooMathWork with this calculation
Local · deterministic · optionalQuick mathNatural-language-style shortcuts for deterministic arithmetic.
Calculator guide
How to use the Customer Churn Rate Calculator
Calculate customer churn rate and the corresponding retention rate for a period.
01Set inputsChoose values, units and assumptions.
02Apply the modelChurn rate = Customers lost ÷ Customers at start of period × 100. Retention = 100% − churn.
03Read the resultCheck the output against the assumptions before using it.
What this calculator does
Measure customers lost relative to the starting customer base for the same period.
Formula & method
Churn rate = Customers lost ÷ Customers at start of period × 100. Retention = 100% − churn.
Assumptions & notes
- For more precise reporting, use your company’s agreed cohort methodology.