Churn Rate Calculator
Find your customer churn rate in seconds. Enter how many customers you started with and how many you lost — get your churn percentage plus the average customer lifetime it implies.
Customer Acquisition Cost (CAC)
How much you spend, on average, to win one new customer.
Customer Lifetime Value (LTV)
The total gross profit you earn from an average customer before they churn.
LTV : CAC Ratio
The single most-watched SaaS efficiency number. 3:1 is the healthy benchmark.
MRR & ARR
Monthly and annual recurring revenue from your customer base.
Churn Rate
The percentage of customers you lose in a period — and the lifetime it implies.
Customer Retention Rate
The percentage of customers you kept, excluding new ones you added.
SaaS Valuation
A revenue-multiple estimate. Faster growth earns a higher multiple.
🔒 100% client-side. Your numbers never leave this page.
How to Calculate Churn Rate
Start a month with 500 customers, lose 15, and your monthly churn is 3%. Keep the window consistent — mixing monthly and annual figures is the most common churn-math mistake.
What Good Looks Like
| Monthly churn | Read | Avg lifetime |
|---|---|---|
| Under 1% | Best-in-class / enterprise | 100+ months |
| 1% – 3% | Healthy SMB SaaS | 33–100 months |
| 3% – 7% | Watch closely | 14–33 months |
| Above 7% | Growth-capping | Under 14 months |
Why Churn Caps Your Growth
Every new customer first has to replace one who left before it adds to growth. At 7% monthly churn you lose over half your base in a year, so acquisition spends much of its energy just standing still. Lowering churn does double duty: it raises lifetime value and frees acquisition to drive real net growth.
The highest-leverage churn fixes
- Onboarding & activation. Most churn is decided in the first 14 days. Get users to their first win fast.
- Annual plans. They remove eleven monthly cancel decisions and lift retention structurally.
- Proactive save flows. Catch at-risk accounts before renewal, not after they've left.
- Fix the reason, not the symptom. Exit surveys tell you whether it's price, product gaps, or onboarding.
Built and tested by Alston Antony — 500+ SaaS tools reviewed, 15,000-member founder community. Napkin math for founders, free and private.
Frequently Asked Questions
How do you calculate churn rate?
Customer (logo) churn = customers lost during a period ÷ customers at the start of that period × 100. If you began the month with 500 customers and lost 15, churn is 15 ÷ 500 = 3%. Keep the period consistent (monthly or annual) so the number is comparable over time.
What is a good churn rate for SaaS?
For SMB / self-serve SaaS, under 3% monthly customer churn is healthy and under 1% is best-in-class. Enterprise SaaS runs much lower, often well under 1% monthly. Annualised, 3% monthly compounds to roughly 30% a year, so small monthly differences matter enormously over 12 months.
What is the difference between customer churn and revenue churn?
Customer (logo) churn counts accounts lost. Revenue churn counts dollars lost, which can differ sharply if your biggest accounts leave or downgrade. Revenue churn can even go negative (net negative churn) when expansion from remaining customers outweighs what you lost — the strongest signal in SaaS.
How does churn affect customer lifetime?
Average customer lifetime is 1 ÷ churn rate. At 5% monthly churn, the average customer stays 20 months; at 2%, they stay 50 months. Because lifetime drives LTV directly, cutting churn is usually the highest-leverage way to improve your unit economics.
Is this churn calculator free?
Yes. No signup, no limits, and every calculation runs locally in your browser — your numbers are never stored or sent anywhere.