Free tool

Churn Calculator

Churn is easy to eyeball wrong. This breaks it into customer churn, gross revenue churn, and net revenue retention — the metric investors actually care about.

Customers

Customers at start of month

Customers lost this month

Revenue (MRR)

MRR at start of month

MRR lost to churn/downgrades

MRR gained from upgrades

Customer Churn

Monthly Churn Rate

5.0%

Est. Annualized Churn

46%

Avg. Customer Lifespan

20.0 months

Healthy — typical for good B2B SaaS

Revenue Retention

Gross Revenue Churn

7.5%

Net Revenue Retention

97%

Leaky bucket — new sales are covering losses

NRR above 100% means your existing customer base grows revenue even with zero new sales — the single strongest signal of a durable SaaS business.