Churn Rate Calculator

Formula

Customers lost ÷ Customers at start × 100

Worked example

20 / 500 — 4%

Quick answer

What does the Churn Rate Calculator do?

Calculate lost customers as a percentage of starting customers.

What is the Churn Rate Calculator?

Calculate lost customers as a percentage of starting customers. Use it when you have the required inputs and want a deterministic, repeatable result with the calculation method visible.

How to use this calculator

Enter the values requested by the tool, keep units and time periods consistent, resolve any validation message, calculate, then review the primary answer together with the displayed formula and supporting values.

Formula and method

This calculator uses the deterministic formula Customers lost ÷ Customers at start × 100. Enter the required values, then review the displayed substitution and result breakdown to verify the calculation.

Worked example

20 / 500 4%

Common mistakes to avoid

Check units, decimal points, percentages, signs, date/time order, selector choices, and rounding. For important decisions, verify the result against an independent source or qualified professional when appropriate.