Two types: customer churn (% of customers who left) and revenue churn (% of revenue lost). Net revenue churn includes expansion (existing customers upgrading) — negative net churn means expansion exceeds churn.
Indian SaaS churn benchmarks: SMB-targeting SaaS 5-12% monthly. Mid-market 2-5%. Enterprise 0.5-2%. High churn signals product-market-fit or onboarding issues.
Churn is calculated: Customers lost in period / Customers at start of period. Annual churn = monthly churn × 12 (approximately). Cohort churn (per acquisition month) gives more accurate signal than blended.