Customer churn rate measures the share of customers who stop paying or leave during a defined period. Revenue churn measures recurring revenue lost from a defined customer base. The two metrics answer different questions, so state which one you mean, how the period is defined, and which accounts are included.
Customer or logo churn formula
A common customer churn formula is: customers lost during the period ÷ customers at the start of the period × 100. For example, if a business begins a month with 200 active customers and 8 of those customers leave, the monthly customer churn rate is 8 ÷ 200 × 100 = 4%. New customers acquired during the month are not added to the starting denominator.
Revenue churn formulas
Gross revenue churn measures recurring revenue lost from the starting customer base, excluding expansion. One simple form is: recurring revenue lost from cancellations and reductions ÷ recurring revenue at the start of the period × 100. Net revenue churn also accounts for expansion in that same base; if expansion offsets losses, net churn can be lower or negative. Net revenue retention provides the complementary view of retained plus expanded revenue; see the NRR formula guide.
Define the measurement rules
- Choose whether churn means account cancellation, paid-seat loss, product departure, or revenue reduction.
- Use the same start and end boundaries for every reporting period.
- Decide how to treat pauses, failed payments, downgrades, and reactivations.
- Separate new customers from the starting cohort.
- State whether the metric covers all customers or a specific plan, market, or cohort.
A calculation is only comparable when the rules stay consistent. Annual contracts, monthly subscriptions, and usage-based pricing may require different treatment. Keep the definition alongside the chart so teams do not confuse a billing event with a customer decision.
Use cohorts and segments
An overall rate can hide meaningful differences between customer groups. Compare cohorts by start period, plan, acquisition channel, use case, or customer size when the data supports it. A new product cohort may behave differently from long-standing customers, and a change in customer mix can move the blended result even when individual segments are stable. The guide to retention by cohort explains how to keep churn and expansion distinct.
Interpret churn without overreacting
Look at the trend over comparable periods, the reasons customers leave, and the value and support costs of the affected accounts. A single month may reflect small sample size, renewals clustered on certain dates, billing changes, or data cleanup. Investigate the underlying accounts before attributing a movement to a campaign or product change.
Common measurement mistakes
- Using ending customers as the denominator for a period-start churn rate.
- Mixing new acquisitions into the group at risk of churning.
- Calling revenue churn customer churn.
- Combining cancellations and expansion into one unexplained number.
- Comparing a monthly rate with an annual rate without consistent normalization.
Frequently asked questions
Is lower churn always better?
Lower losses are generally desirable, but the aggregate rate needs context. A small number of low-fit customers leaving may differ from losing a strategically important cohort. Pair the metric with customer outcomes and economics.
Can churn be negative?
Gross customer churn cannot be negative under the usual definition. Net revenue churn can be negative when expansion from the starting customer base exceeds cancellations and contractions.
Should churn be annualized?
Only when the method is stated and suitable for the customer base. Simple multiplication can misrepresent compounding and seasonality; compare consistent periods when possible.
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