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Customer churn
Measure the proportion of opening customers lost in a period.
Try your numbers
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Your result
How this works
Measure the proportion of opening customers lost in a period.
Formula
Churn = opening customers lost ÷ starting customers × 100.
Assumptions and limits
Exclude new customers from the lost count for this cohort-based measure.
Worked example
Replace the example with your own figures, then compare scenarios. Include all relevant costs and use records from matching periods.