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Retention

Churn Rate

A 2% monthly churn rate sounds harmless. Run the numbers and it means losing nearly a quarter of your customers every year. Churn rate is the metric most SaaS founders understand least when they're small — and the one they regret not prioritising when they're larger.

What is Churn Rate?

Churn rate is the percentage of customers (or revenue) that a SaaS business loses in a given time period. It's the most direct measure of how well your product retains the customers it acquires.

The formula: Customer Churn Rate = (Customers lost in period ÷ Customers at start of period) × 100

If you started the month with 500 customers and ended with 480, you lost 20 — a 4% monthly churn rate.

Customer Churn vs. Revenue Churn

Customer churn rate measures the percentage of accounts lost. It treats every customer equally regardless of contract size.

Revenue churn rate (MRR churn) measures the percentage of MRR lost. It weights customers by their revenue contribution, which is more meaningful for most business decisions.

The two metrics can tell very different stories. A company with many small-plan customers churning while enterprise accounts remain stable will show high customer churn but low revenue churn. For growth forecasting, revenue churn is almost always the more important number.

Why Small Differences in Churn Rate Compound Dramatically

The compounding math of churn is something every SaaS founder should internalise. Consider two companies, both starting with 1,000 customers and acquiring 50 new customers per month:

  • Company A (2% monthly churn): Needs 20 new customers just to break even. Can invest the remaining capacity in growth.
  • Company B (5% monthly churn): Needs 50 new customers to break even. Spends its entire acquisition budget just to stay flat.

Over 24 months, Company A reaches ~1,700 customers. Company B struggles to hold 1,000. The same acquisition engine produces dramatically different outcomes when churn rates differ by just 3 percentage points.

Churn Rate Benchmarks

  • Below 1% monthly: Exceptional. Typical of strong enterprise SaaS with long-term contracts.
  • 1–2% monthly: Healthy for most B2B SaaS products.
  • 2–5% monthly: Manageable early stage, concerning at scale.
  • Above 5% monthly: Critical — the business model is likely broken at this rate.

Frequently Asked Questions

What is a good monthly churn rate for SaaS?
For B2B SaaS, below 2% monthly is healthy. Below 1% is excellent. B2C SaaS typically runs higher because acquisition costs are lower and customer relationships are less sticky. Annual churn below 10% is broadly considered sustainable for most B2B businesses.
Should you track customer churn rate or revenue churn rate?
Both, but they tell different stories. Customer churn rate tells you how many accounts you're losing. Revenue churn rate tells you how much money you're losing. If you're losing many small accounts but keeping your large ones, customer churn looks bad while revenue churn looks fine. For business health, revenue churn is typically more meaningful.
How does monthly churn rate translate to annual churn?
Annual churn rate ≈ 1 − (1 − monthly churn rate)^12. A 2% monthly churn becomes roughly 21% annual churn. A 5% monthly churn becomes roughly 46% annual churn. The compounding effect is why small improvements to monthly churn have an outsized impact on long-term customer base size.

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