Churn quietly caps your growth. Enter customers at the start of a period and how many churned to get churn %, retention % and the average customer lifetime that implies.
Works the same with MRR instead of customer counts (revenue churn).
Runs entirely in your browser — nothing you enter is uploaded or stored.
Churn rate is the share of customers (or revenue) lost in a period: churned ÷ starting count × 100. It silently caps growth — at 5% monthly churn the average customer lasts only 20 months. This calculator returns churn %, retention % and the implied average customer lifetime, and works the same for revenue (MRR) churn.