Find your churn rate — the share of customers you lost in a period — and your retention rate, the number that quietly decides whether a subscription business grows.
Average lifespan (1 ÷ churn) is an approximation that assumes a steady churn rate. Track churn on a consistent period (monthly or annual). Estimate only.
Churn is the share of customers who leave in a period. Its mirror is retention. At 5% monthly churn the average customer stays about 20 months; halving churn roughly doubles that lifespan — and the lifetime value with it.
Churn = customers lost ÷ customers at start · Avg. lifespan ≈ 1 ÷ churn
Lower is always better; healthy SaaS often targets low single-digit monthly churn. Compare against your own trend and your sector.
This measures customer churn (accounts lost). Revenue churn weights by how much each account paid — losing big accounts hurts more.
Related: customer lifetime value calculator · MRR & ARR calculator · customer acquisition cost calculator · all free calculators.
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Yes. The Churn Rate Calculator is completely free, runs in your browser, and never asks for a signup, email, or download. Enter your numbers and the result updates instantly.
It uses standard formulas and recalculates the moment you change a value, so the math is exact for the inputs you enter. Treat the result as a reliable planning estimate; for decisions with legal or tax consequences, confirm the figures with a qualified professional.
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Last reviewed: September 2026. Free to use, no signup — Churn Rate Calculator by ToolWise Digital.
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