Customer churn rate calculator

Simple churn % = customers lost ÷ customers at period start × 100. Use cohort tools for advanced views.

Inputs

Enter valid numbers. Calculations run entirely in your browser.

Customers lost in period

Customers at period start

Churn rate (%) —

Start 800, lost 40 → about 5% churn.

For subscription businesses, pair with cohort revenue for net retention.

Label the window clearly; never mix denominators.