Work out churn from customers at the start and customers lost, with the monthly and yearly equivalents and expected lifetime.
Enter the starting number and how much was lost.
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Churn is the share of customers lost in a period: 30 gone from 600 is 5%. Retention is the remainder, 95%.
churn = customers lost ÷ customers at start × 100
Pick the period you measured. The tool compounds that churn into a monthly and a yearly rate, and gives the average lifetime in periods as one divided by churn.
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