Calculate churn rate from customers lost and start count — see monthly and annual churn, retention and revenue impact.
Calculate churn rate from customers lost and start count — see monthly and annual churn, retention and revenue impact.
Enter values above and click Calculate — results will appear here with the formula explained.
Churn is customers lost in a period divided by customers at the start of that period, expressed as a percent; retention is simply 100 minus churn. New customers are deliberately excluded from the denominator for gross churn, though they determine net customer change — losing 50 of 1,000 while adding 80 yields 5% churn but net growth of 30. Monthly churn annualizes as 1 minus (1 minus monthly rate) to the twelfth power.
A 5% monthly churn compounds to about 46% annual, not a naive 60%, because the base shrinks each month. SaaS businesses often budget for under 3% monthly gross churn once product–market fit is solid; above 5% warrants investigation of onboarding, fit or competition. New-customer quality directly affects future churn, so segment by acquisition channel before averaging.
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Churn is customers lost in a period divided by customers at the start of that period, expressed as a percent; retention is simply 100 minus churn. New customers are deliberately excluded from the denominator for gross churn, though they determine net customer change — losing 50 of 1,000 while adding 80 yields 5% churn but net growth of 30. Monthly churn annualizes as 1 minus (1 minus monthly rate) to the twelfth power. Formula: Churn = lost/start*100; Retention = 100-churn; Annualized = 1-(1-monthly)^12
Churn Rate Calculator: Calculate churn rate from customers lost and start count — see monthly and annual churn, retention and revenue impact. Formula: Churn = lost/start*100. Example: With 1000 start, 50 lost, 80 new: churn 5%, retention 95%, net +30 customers.
Calculate churn rate from customers lost and start count — see monthly and annual churn, retention and revenue impact. Formula: Churn = lost/start*100; Retention = 100-churn; Annualized = 1-(1-monthly)^12
| Field | What to enter |
|---|---|
| Customers at start | e.g. 1000 |
| Customers lost in period | e.g. 50 |
| New customers (optional) | e.g. 80 |
All fields use the exact formulas shown below — results include step-by-step breakdowns you can verify by hand.
Churn is customers lost in a period divided by customers at the start of that period, expressed as a percent; retention is simply 100 minus churn. New customers are deliberately excluded from the denominator for gross churn, though they determine net customer change — losing 50 of 1,000 while adding 80 yields 5% churn but net growth of 30. Monthly churn annualizes as 1 minus (1 minus monthly rate) to the twelfth power.
A 5% monthly churn compounds to about 46% annual, not a naive 60%, because the base shrinks each month. SaaS businesses often budget for under 3% monthly gross churn once product–market fit is solid; above 5% warrants investigation of onboarding, fit or competition. New-customer quality directly affects future churn, so segment by acquisition channel before averaging.
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AdSense ready — add NEXT_PUBLIC_GOOGLE_ADSENSE_PUBLISHER_ID
With 1000 start, 50 lost, 80 new: churn 5%, retention 95%, net +30 customers.
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AdSense ready — add NEXT_PUBLIC_GOOGLE_ADSENSE_PUBLISHER_ID