RetainFlow · Free tools
SaaS Churn Rate Calculator
Find out how much churn is silently killing your MRR.
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Guide
How is churn rate calculated?
From logo churn to revenue churn, annualization, and a simple revenue-impact shortcut—organized for quick scanning.
Monthly customer churn
A SaaS churn rate calculator like this one uses your starting customer count and how many customers you lost in a month to produce a monthly customer churn rate: lost customers divided by customers at the start of the period, as a percentage. That is the headline figure boards use when asking whether retention is improving.
Revenue churn vs. customer churn
Monthly revenue churn compares the dollars you lost from those customers to your total MRR—so if ARPU varies, revenue churn can differ from customer churn. Our SaaS churn rate calculator shows both so you can see whether downsells or low-ARPU exits are distorting the picture.
Annualizing churn
Annual churn here compounds the monthly customer churn rate across twelve months using (1 − (1 − r)¹²), which assumes a steady monthly rate—a simplification every free SaaS churn rate calculator uses for quick planning, not audited reporting.
Projected revenue impact
Revenue lost this month is lost customers × ARPU. The twelve-month line multiplies that monthly revenue loss by twelve for a rough scenario—not a renewal model with expansion, but a useful wake-up call for prioritizing retention work.