What is Churn Rate?
The percentage of customers or revenue lost during a given period, calculated as customers lost divided by customers at the start of that period.
Churn Rate is the percentage of customers or revenue lost during a given time period, calculated as the number of customers who cancelled divided by the total number of customers at the start of the period. It is the single most destructive force on SaaS unit economics because of its compounding nature: even a small monthly churn rate eliminates a large fraction of the customer base over a year. Both customer churn and revenue churn should be tracked separately.
Formula
Churn Rate = (Customers Lost / Customers at Start of Period) x 100%Monthly Customer Churn Example: 10 cancellations from 500 starting customers = 2% monthly churn. Annual equivalent: 1 - (1 - 0.02)^12 = 21.5% annual churn. Revenue Churn (Gross): (MRR Lost from Cancellations + Downgrades) / Starting MRR x 100%. Net Revenue Churn subtracts expansion MRR from the numerator.
Industry Benchmarks
- Excellent monthly churn: under 0.5% (less than 6% annually)
- Good monthly churn: 0.5% to 1% (6-12% annually)
- Acceptable monthly churn: 1-2% (12-22% annually)
- Danger zone: above 3% monthly (above 30% annually)
- Negative net revenue churn (NRR > 100%) is world-class for expansion-led SaaS
When to Use Churn Rate
- Diagnosing the health of customer retention before it compounds into a growth crisis
- Calculating the maximum sustainable CAC given current LTV implied by churn rate
- Identifying cohorts or segments with anomalously high churn to prioritise product investment
- Modelling the revenue impact of a 1-point churn reduction to build the business case for retention programs
- Tracking only customer churn and ignoring revenue churn, which can be higher or lower depending on which plan tiers are churning
- Measuring churn on a quarterly or annual basis, which masks within-period acceleration
- Using net churn (after new activations) instead of gross churn, which conceals true cancellation rates
- Cohort churn analysis - group customers by acquisition month - reveals whether recent customers churn faster than older ones, a leading indicator of product or ICP problems
- Voluntary churn (cancellations) and involuntary churn (failed payments) require completely different interventions
- Track churn by customer segment, plan, and acquisition channel to find which customers need the most retention investment
Related Terms
Free Churn Rate Calculator
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