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Churn Rate Calculator

Calculate customer churn rate for a period and compare retention across segments or cohorts.

Customer churn rate measures the share of customers you lost over a period. It is a core retention metric for subscription businesses.

Churn can be misleading if you mix segments. Track churn by cohort, plan, and acquisition channel before you make budget decisions.

Prefer an explanation- Read the guide.

Need definitions- Browse the glossary.

Customers at start

Customers lost

Periods per year (optional)

12 for monthly, 4 for quarterly. Used to compute annualized churn.

Forecast periods (optional)

Used to estimate retained customers after N periods.

Tip: you can type commas (e.g., 10,000).

Example

Using the default inputs, the result is:

Pick a time window (month/quarter) and a segment (plan/channel/geo).
Enter customers at the start of the period and customers lost during the period.
Compute churn = lost / start and retention = 1 - churn.
Optionally annualize churn by specifying periods per year (12 for monthly, 4 for quarterly).
Optionally add forecast periods to estimate how many customers remain.

Churn Rate = Customers Lost / Customers at Start

Small changes in churn compound over time; pair churn with LTV and payback.
If churn is mostly involuntary (failed payments), fix dunning before you change acquisition budgets.
Revenue retention (NRR/GRR) can look better than customer churn if expansion is strong.

What about expansion revenue-

Customer churn ignores upsells/downsells. Use NRR/GRR when you want a revenue-based view.

Comparing churn across periods with different definitions of 'active customer'.
Using blended churn across segments with different retention (the blend can drift).
Annualizing a period that is not consistent (for example mixing monthly and quarterly inputs).