Definition
Churn rate measures the fraction of customers (logo churn) or recurring revenue (revenue churn) lost over a period. It is one of the most important drivers of LTV and payback.
Formula
Churn rate = losses / starting base (customers or revenue)
Example
If you start the month with 1,000 customers and lose 35, logo churn = 35 / 1,000 = 3.5% for the month.
How to use it
- Specify whether churn is logo churn (count) or revenue churn (dollars).
- Keep time units consistent (monthly vs annual) when using churn in formulas.
- Use cohort curves to see how churn changes over time rather than relying on a single average.
Common mistakes
- Mixing logo churn with revenue retention metrics (NRR/GRR).
- Using annual churn as if it were monthly churn (time unit mismatch).
- Relying on blended churn when segments behave differently.
Measured as
Churn rate = losses / starting base (customers or revenue)
Misused when
- Mixing logo churn with revenue retention metrics (NRR/GRR).
- Using annual churn as if it were monthly churn (time unit mismatch).
- Relying on blended churn when segments behave differently.
Operator takeaway
- Specify whether churn is logo churn (count) or revenue churn (dollars).
- Keep time units consistent (monthly vs annual) when using churn in formulas.
- Use cohort curves to see how churn changes over time rather than relying on a single average.
- Keep Churn Rate consistent by cohort, segment, and period before you use it as a decision signal in planning or reporting.
- Interpret the metric alongside retention, margin, or payback so one ratio does not hide the real operating trade-off.
Next decision
- Quantify the impact with Churn Rate Calculator if you need to turn the definition into an operating assumption.
- Read Retention curves: how to read them and why they matter if the decision depends on interpretation, policy, or trade-offs beyond the raw formula.
Where to use this on MetricKit
Calculators
- Churn Rate Calculator: Calculate customer churn rate for a period and compare retention across segments or cohorts.
- Retention Rate Calculator: Calculate retention rate for a period accounting for new customers.
- LTV Calculator: Estimate customer Lifetime Value (LTV) using ARPA, gross margin, and churn rate.
- LTV Sensitivity Calculator: See how gross profit LTV changes as churn and gross margin vary (simple 3x3 sensitivity).
- Unit Economics Calculator: Model CAC, payback, LTV, and LTV:CAC together from ARPA, gross margin, and churn.
Guides
- Retention curves: how to read them and why they matter: A practical guide to retention curves: what they show, how to interpret churn vs retention, and how to connect retention to LTV and payback.
- Cohort LTV forecasting: churn, expansion, discounting (practical model): A practical guide to cohort-based LTV: why it beats simple churn formulas, how to choose assumptions, and how to interpret discounted LTV.
- LTV guide: formula, customer lifetime, cohort models, and LTV:CAC: A practical LTV guide covering shortcut formulas, gross profit vs revenue LTV, customer lifetime, cohort-based models, and how to connect LTV to CAC and payback.
- LTV sensitivity: how churn and margin change LTV: A practical guide to LTV sensitivity: vary churn and gross margin to see how gross profit LTV changes under realistic scenarios.
- Churn: How to measure churn rate correctly: A guide to churn rate: customer churn vs revenue churn, measurement choices, and how to track churn by cohort.