calculate · free tool
Customer retention rate calculator
Measure retained and lost customers while catching impossible cohort inputs.
Live model
Customer retention rate calculator
Every result updates as you type
Live results
Up to date- Retained customers
- 430
- Customers lost
- 70
- Retention rate
- 86%
Customer retention subtracts newly acquired customers from ending customers, then divides retained customers by the starting cohort.
How this tool works
A useful result, with clear limits
Separates retained customers from new customers in a cohort, then reports customer retention rate and losses.
How to use it
- Enter customers at period start and end.
- Enter new customers acquired during the period.
- Resolve any impossible cohort warning before using the percentage.
Inputs and output
- Inputs
- Starting customers, ending customers, and new customers acquired during the period.
- Output
- Retained customers, customers lost, and retention rate.
Formula
Retained = ending customers − new customers; retention rate = retained ÷ starting customers × 100.
Privacy
Cohort counts stay in local browser state and are not sent to a server.
Straightforward by design
What to expect
One focused workflow, clear constraints, and no hidden result gate.
Does Customer retention rate calculator upload my input?
The utility processes your input in this browser. ArcDemo only receives content when you explicitly choose a hosted save or product creation flow.