Churn Rate Calculator
Calculate SaaS customer churn rate, subscription cancellation percentages, and revenue attrition.
Customer churn rate
Churn rate formula
Customer churn calculates the percentage of existing subscribers or accounts lost during a specific measurement window:
Note: Starting customers excludes new accounts acquired during the current period.
Churn rate examples
Monthly SaaS subscriber churn
A software company starts the month with 800 active paying users and experiences 32 cancellations.
Annual enterprise contract retention
A B2B agency begins the year with 120 client contracts and retains 114 clients by year-end (6 departures).
Frequently asked questions
How do you calculate customer churn rate?
Divide lost customers during a period by customers at the start of that period, and multiply by 100: Churn Rate (%) = (Lost Customers ÷ Starting Customers) × 100. For example, losing 25 subscribers from a 500 starting base is (25 ÷ 500) × 100 = 5.00% monthly churn.
What is an acceptable SaaS churn rate?
For B2B SaaS serving mid-market or enterprise accounts, annual churn below 5%–7% (approx. 0.5% monthly) is considered healthy. For B2C or high-volume SMB SaaS, monthly churn typically ranges between 2% and 5%.
Does churn rate account for new customers acquired?
No. Standard customer churn rate measures only how many existing customers from the starting cohort cancelled. New customers gained during the period are tracked separately under Net Revenue Retention (NRR) or Gross Additions.
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