Churn Rate Calculator
Calculates the percentage of customers lost during a given period and the inverse retention rate. Divide customers lost by customers at the start of the period — not total customers including new additions.
Moderate churn — focus on retention initiatives.
Why Churn Rate Calculator Matters
Churn is the silent killer of subscription businesses. A 5% monthly churn means you lose over 46% of your customer base in a year — you would need to replace nearly half your revenue just to stay flat. Dropping from 5% to 3% monthly churn increases average customer lifespan from 20 to 33 months, boosting LTV by 65%. Best-in-class B2B SaaS companies maintain monthly churn below 1%; B2C subscriptions typically run 5–7%.
Example Calculation
A SaaS tool starts January with 2,000 customers. By January 31, 90 customers have cancelled. Churn rate = (90 / 2,000) × 100 = 4.5%. Retention rate = 95.5%. At this rate, average customer lifespan = 1 / 0.045 = 22 months. If LTV = $79/month × 22 months = $1,738, and CAC = $400, LTV:CAC = 4.3:1 — healthy. But if churn rises to 7%, lifespan drops to 14 months, LTV falls to $1,106, and that same $400 CAC now gives only a 2.8:1 ratio — below benchmark.
Practical Tips
- Always measure churn over the same period consistently — monthly churn and annual churn are not interchangeable. Monthly churn of 5% is not the same as 60% annual churn; the correct annualization is 1 − (1 − 0.05)^12 = 46% annual churn.
- Segment churn by cohort and acquisition channel. Customers acquired through paid ads often churn faster than those who came through organic search or referral — channel-level churn reveals where to focus retention investment.
- Track revenue churn alongside customer churn. If your churned customers were smaller accounts, revenue churn may be lower than customer churn. If they were larger accounts, revenue churn will be higher. Both metrics tell different stories.
- Investigate churn reasons systematically. Exit surveys, cancellation flows, and customer interviews are the only way to distinguish fixable product issues from normal graduation (customers outgrowing your tool). Do not optimize against the wrong problem.
Frequently Asked Questions
- Churn Rate = (Customers Lost in Period / Customers at Start of Period) × 100. It measures the percentage of customers who cancelled or did not renew during a given timeframe. The inverse — retention rate — is 100 minus churn.
- For B2B SaaS: monthly churn under 2% is excellent; 2–5% is acceptable. Enterprise SaaS: aim for under 1%. B2C subscriptions: 5–7% monthly is typical. Media/streaming: 3–5% monthly. Always benchmark against your own historical trend as well as industry peers.
- At 5% monthly churn, you lose ~46% of customers per year and need to replace half your customer base just to stay flat. At 2% monthly churn, annual loss is ~21%. Reducing monthly churn by even 1 percentage point dramatically reduces the "replacement treadmill" you are running on.
- Customer churn tracks the number of customers lost. Revenue churn (or MRR churn) tracks the dollar value of subscriptions lost. They differ when churned customers are not representative of your average customer. Track both: revenue churn is more important for financial impact assessment.
- Negative churn occurs when expansion revenue from existing customers (upgrades, seat additions, usage growth) exceeds revenue lost from cancellations. It is the hallmark of elite SaaS businesses — even if customers churn, net revenue from the existing base still grows.
- Identify churn triggers using cohort analysis — which customer segments, acquisition sources, or usage patterns predict churn. Common interventions: improve onboarding for new users, build an in-app customer success workflow, create proactive check-ins at the 30/60/90-day marks, and add features that create switching costs.
Disclaimer
These tools provide estimates for informational purposes only. Results should not be used as the sole basis for financial, business, or legal decisions. Always consult qualified professionals for advice specific to your situation.