Churn Rate Calculator
Monthly churn = lost / starting. Annual churn = 1 - (1 - monthly)^12.
Updated May 2026, using HMRC 2026/27 rates and current ONS / gov.uk figures.
Type lost customers as numerator and starting customers as denominator.
Worked examples
5 lost from 200 in a month = 2.5% monthly churn = ~26% annualised.
10% annual churn = ~0.87% monthly churn.
Frequently asked questions
Annual or monthly?
Quote whichever is most relevant. SaaS typically reports monthly; insurance and consumer subs annual.
What's a healthy SaaS churn?
B2B SMB SaaS: 5-7% monthly often acceptable. B2B mid-market: under 1% monthly. Consumer: 5-10% monthly common.