Churn Rate Calculator
Free CalculatorTurn the customers you started with and the customers you lost into churn rate, retention and average lifespan β instantly and privately.
100% private
Runs in your browser β no numbers leave your device.
Your numbers
How many customers you had at the start of the period.
How many of them cancelled or churned during the period.
Churn rate
5.0%
Monthly churn of 5% or less is healthy for most apps; above 10% caps your growth.
Retention rate
95.0%
The flip side of churn β the share of customers who stayed.
Avg. customer lifespan
20 mo
1 Γ· churn rate β assumes the churn rate is monthly.
How it works
Pick a period
Choose a consistent window β most teams track churn monthly.
Enter customers at start
The number of active customers when the period began.
Enter customers lost
How many of those customers cancelled during the period.
Read your rates
Churn, retention and average lifespan update live.
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How to calculate churn rate
Churn rate is the percentage of customers who leave over a set period. This churn rate calculator uses the simplest, most common formula: divide the customers you lost during the period by the customers you had at the start, then multiply by 100. Start with 1,000 customers, lose 50, and your churn rate is 5%. The mirror image is your retention rate β the 95% who stayed β and the two always add up to 100%.
Churn also tells you how long a customer sticks around: average customer lifespan is 1 Γ· churn rate. A 5% monthly churn means the average customer stays about 20 months, while 10% churn cuts that to 10. That link is why churn matters so much β even a small drop in churn stretches every customer's lifetime value and compounds your growth. Keep the period consistent (usually monthly) so the number stays comparable over time.