How to measure and report churn: gross vs net, logo vs revenue, cohort curves, and the churn benchmarks investors expect at each stage.
Churn is the number that quietly decides whether a SaaS company is fundable. Growth hides bad churn for a while — then it doesn't.
Logo churn = % of customers that left. Revenue churn = % of MRR that left. If small customers churn and large ones stay, revenue churn looks healthier than logo churn. Report both.
Gross retention caps at 100% — measures pure churn and contraction. Net retention adds expansion and can exceed 100%. Best-in-class SaaS: >90% gross, >120% net. Below 80% gross at Series A is a red flag.
Group customers by month of acquisition. Track retention over time. A flat cohort curve after month 3-6 = product-market fit. A cohort that keeps decaying = you don't have PMF, no matter what monthly churn shows.
At 5% monthly churn, you're replacing your entire customer base every 20 months. Growth compounds; so does churn. Investors model out how much new ARR you need just to stand still — high churn means the treadmill is faster.
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