Churn rate calculator

Customer loss and average lifetime.

Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18

Customers at start

Customers lost

Monthly churn

3.50%

Average lifetime

2 yr 5 mo

With these inputs, monthly churn comes to 3.50%. Average lifetime works out to 2 yr 5 mo.

What moves the number · Monthly churn

Input	−10%	Now	+10%
Customers at start	3.89%	3.50%	3.18%
Customers lost	3.15%	3.50%	3.85%

Whatmakesequal

Save this set of inputs, change something, then save again to compare the outcomes side by side.

Customer loss and average lifetime.

With the defaults above, monthly churn works out at 3.50%.