What is Churn Rate in SaaS? Definition, Formula & Benchmarks
What is Churn Rate in SaaS? Definition, Formula & Benchmarks
Churn rate is the percentage of customers or revenue your SaaS business loses during a given period. It is the single most powerful destroyer of SaaS value — and the most underestimated one. Even a 5% monthly churn means you replace your entire customer base roughly every 20 months just to stay flat.
Churn Rate Definition
Churn rate (also called customer churn or logo churn) measures the percentage of customers who cancel or do not renew their subscription during a defined period — typically a month or a year. A second form, revenue churn, measures the percentage of MRR lost rather than the percentage of customers.
Churn Rate Formula
Churn Rate = (Customers Lost During Period ÷ Customers at Start of Period) × 100
Example: You start the month with 400 customers and end with 380. You lost 20. Churn Rate = (20 ÷ 400) × 100 = 5%.
Use our Churn Rate Calculator to calculate yours instantly.
Monthly vs Annual Churn Rate
Monthly churn and annual churn are not interchangeable. A 5% monthly churn does not equal 60% annual churn — because each month’s base is smaller due to prior churn. The accurate conversion: Annual Churn = 1 − (1 − Monthly Churn Rate)^12. A 5% monthly churn actually equals approximately 46% annual churn — far more destructive than it sounds.
Customer Churn vs Revenue Churn
Customer churn counts lost accounts. Revenue churn counts lost MRR. A business that loses small, low-value customers but retains large accounts will have high customer churn but low revenue churn. Both matter, but revenue churn more directly impacts business health. See the full breakdown in Gross Churn vs Net Churn.
Churn Rate Benchmarks
For SMB-focused SaaS, 3–7% monthly churn is typical. For mid-market SaaS, 1–3% monthly is the target. For enterprise SaaS, best-in-class is under 1% monthly (under 10% annually). Consumer SaaS can see much higher churn and typically measures it differently. Compare to Net Revenue Retention benchmarks for a fuller picture.
The Compounding Effect of Churn
Reducing monthly churn by 1–2 percentage points has a dramatic compounding effect on MRR and LTV. At 5% monthly churn, average customer lifespan is 20 months. At 3% monthly churn, it jumps to 33 months — a 65% increase in LTV from a single improvement. This directly improves your LTV:CAC ratio and overall unit economics.
How Churn Connects to Other Metrics
Churn Rate determines average customer lifespan, which is a direct input to LTV. Revenue churn tracked against expansion revenue gives you Net Revenue Retention. Both feed into whether your LTV:CAC ratio is healthy. See the full framework in the SaaS Metrics Guide.
Frequently Asked Questions
What causes high churn in SaaS? The most common causes are poor onboarding (customers never reach activation), lack of perceived value over time, competitive alternatives, pricing misalignment, and changes in the customer’s own business. Identifying your specific cause requires churn interview data, not just the metric.
Can a SaaS business have negative churn? Yes — through net revenue retention above 100%. If expansion revenue from upsells exceeds churned revenue, your existing customer base grows in revenue even as some customers leave. This is the holy grail of SaaS economics. Read What is NRR.
Should I measure monthly or annual churn? Measure both. Monthly churn gives you fast feedback for operational decisions. Annual churn is better for benchmarking and investor conversations. Always be explicit about which you are reporting — they are not interchangeable.