What Is Churn Rate?
Churn rate is the percentage of customers or revenue lost in a given period. High churn kills SaaS businesses — even strong new customer growth can't overcome a leaky bucket.
Definition
Churn rate is the percentage of customers (customer churn) or revenue (revenue/MRR churn) lost over a given period, typically monthly or annually. Monthly customer churn of 5% means you lose 5% of your subscribers every month — compounded, that's losing 46% of your customers per year.
Revenue churn (or MRR churn) is often more useful than customer churn — losing one $10K/year enterprise customer hurts more than gaining ten $500/year SMB customers. Revenue churn accounts for the dollar impact rather than the headcount impact.
Annual churn rates for healthy SaaS businesses: SMB SaaS under 10% annually, mid-market SaaS under 7%, enterprise SaaS under 5%. The best enterprise SaaS companies achieve negative net churn (where expansion revenue from existing customers exceeds churn) — meaning the base grows even without adding new customers.
Real-World Example
A SaaS company starts the month with 500 customers and 20 cancel. Customer churn rate = 20/500 = 4%. Those 20 churned customers paid $2,000/month total, while the remaining 480 customers pay $50,000. Revenue churn rate = $2,000/$52,000 = 3.8%. The revenue churn is lower because the canceling customers were smaller than average.
Why It Matters
Churn is the most critical threat to a SaaS business. At 2% monthly churn, a company's customer base has a median lifetime of just 3.5 years. Reducing churn from 5% to 2% monthly can 3x the long-term value of the business.
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Frequently Asked Questions
What is a good churn rate for SaaS?
For monthly billing, under 2% monthly churn (under 22% annual) is acceptable for SMB SaaS; under 1% is good. For annual contracts, under 10% annual churn is the standard benchmark. Enterprise SaaS targeting Fortune 500 customers should aim for under 5% annual churn.
What causes high churn?
Common churn drivers: poor onboarding (customers never reach value), poor product-market fit (wrong customers or wrong product), competitive displacement, budget cuts, company closures, and lack of customer success investment. Identifying your top churn reason is the first step to fixing it.
What is negative churn?
Negative churn (also called net negative churn) occurs when expansion revenue from existing customers (upsells, cross-sells, seat expansions) exceeds revenue lost to churn. At negative net churn, your existing customer base grows revenue even without adding new customers — the holy grail of SaaS.
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