Customer Churn Rate Calculator
Estimate logo churn by reconstructing customer losses from period-start, period-end, and acquisition counts. Optional annualization helps compare monthly and quarterly trends.
Educational estimate for planning and benchmarking. Confirm definitions with your finance and BI teams.
Examples
- Start 5,000 customers, end 4,850 customers, 300 new customers, annualization 12 ⇒ Customer churn rate: 9.00% | Lost customers: 450.00 | Annualized: 108.00%
- Start 2,200 customers, end 2,180 customers, 140 new customers, annualization left blank (default 1) ⇒ Customer churn rate: 7.27% | Lost customers: 160.00 | Annualized: 7.27%
FAQ
Why does this method use start + new − end?
It reconstructs the count of customers who left during the period when only opening, closing, and acquisition counts are available.
Can annualized churn exceed 100%?
Yes. Annualization is a linear scaling of short-period churn and can exceed 100% if monthly churn is high.
Should I include reactivated accounts as new customers?
Use one policy consistently. Most teams classify reactivations as new adds if the prior contract was fully terminated.
Additional Information
- Primary output is period churn rate in percent (%), rounded to two decimals with en-US formatting.
- Lost customers are reconstructed as start + new − end, bounded at zero to avoid negative churn artifacts.
- Annualization factor is optional and defaults to 1. Typical values are 12 for monthly and 4 for quarterly periods.
- This calculator reports logo churn, not revenue churn. Use revenue-weighted methods for gross or net revenue retention analysis.