How do I calculate customer churn rate?

Churn rate = (Customers lost during period ÷ Customers at start of period) × 100. A 5% monthly churn means you lose 5 out of every 100 customers each month.

Churn Rate Calculator

Estimate churn rate from customer counts.

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Customers at start of period

Customers lost

About This Calculator

Churn rate is the percentage of customers you lose in a given period. It directly determines customer lifetime (1 ÷ monthly churn rate = average months retained) and is the primary lever for improving LTV. Even small churn improvements have outsized compounding effects on business value.

Estimates only — not financial, tax, legal, or investment advice. Verify important results with a qualified professional before making decisions.

churn % = lost ÷ starting × 100; retention = 100 − churn %; customers remaining = starting − lost