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Customer Churn Rate Calculator

Calculate customer churn rate with labeled inputs, explicit units and the formula churn = 100 lost customers / starting customers.

Business workspace● Runs in your browser
01 Your input
02 Your result
YOUR RESULT
Ready when you are
Formulachurn = 100 lost customers / starting customers

How to use this tool

  1. Enter each labeled measurement using the units shown.
  2. Review the formula and assumptions, then calculate.
  3. Read the result with its output unit; change inputs to compare scenarios.

Try this example

{"l": 5.0, "n": 100.0}

Accuracy and scope

Count losses from the starting cohort; exclude newly acquired customers. Uses finite JavaScript floating-point arithmetic. Keep compatible units; rounded display values are not exact symbolic results. Estimates are not engineering certification or financial advice.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.