Standard customer churn
Customer churn = customers lost ÷ customers at start, the definition most SaaS teams share with investors.
Tools / Churn Rate Calculator
Churn Rate Calculator
Enter customers at the start of a period and how many left. Get churn, retention, lifetime, and correctly compounded annual churn.
Churn = customers lost ÷ customers at start
Enter customer counts to see the result
- 1
Pick the period
Choose monthly, quarterly, or annual so annualization matches how you report.
- 2
Enter customer counts
Customers at the start of the period, and how many cancelled or otherwise left.
- 3
Optional: revenue churn
Add starting MRR and MRR lost to see revenue churn next to customer churn.
Why use this churn rate calculator
Turn start and lost counts into retention metrics founders and CS teams actually use.
Compound annualization
Annual churn uses 1 − (1 − period churn)^n, not period × 12, so the shrinking base is handled correctly.
Retention and lifetime
See retention rate and average customer lifetime in periods (1 ÷ churn) beside the headline rate.
When to calculate churn
Monthly SaaS reviews
Close the books on logo churn before the board deck is locked.
Cohort health checks
Compare churn across plans or segments with the same formula every time.
Revenue vs logo
Spot when you lose few customers but expensive ones (revenue churn higher than logo churn).
Churn formulas used here
Churn = lost ÷ start · Annual = 1 − (1 − churn)^n · Lifetime ≈ 1 ÷ churn
n is 12 for monthly input and 4 for quarterly. Retention = 1 − churn. Revenue churn uses the same ratio on MRR.
Rough monthly customer churn bands
≤1%
Very strong
1–3%
Healthy for many B2B / SMB
3–5%
Common early / consumer
>5%
High attrition
Churn vs loyalty scores
Churn rate
- Behavioral: who actually left
- Needs start and lost counts
- Pairs with revenue for $ impact
NPS / CSAT
- Attitudinal: how people feel
- Predicts risk before they cancel
- Use alongside churn, not instead
Related calculators
Frequently asked questions
How do you calculate customer churn rate?
Customer (logo) churn = customers lost during the period ÷ customers at the start of the period.
Example: start with 500, lose 15 → 15 ÷ 500 = 3% churn for that period.
How do you annualize monthly churn?
Use the compound formula: annual churn = 1 − (1 − monthly churn)^12.
Multiplying by 12 overstates annual loss because the customer base shrinks each month. A 5% monthly rate is about 46% annual, not 60%.
What is customer lifetime from churn?
Average lifetime in periods ≈ 1 ÷ churn rate. At 2% monthly churn, lifetime is about 50 months, assuming a constant rate.
Real lifetimes vary by cohort; this is a quick planning estimate.
What is revenue churn?
Revenue churn = MRR lost in the period ÷ MRR at the start. It weights expensive cancellations more heavily than logo count alone.
Net revenue churn (with expansion) is a separate metric and is not included here.
What churn rate is “good”?
It depends on segment. Many B2B SaaS teams aim near 1% monthly or lower for enterprise, while SMB and consumer products often sit higher.
Use the note under your result as a rough band, then benchmark against your own category.
Should I count new customers in the denominator?
Classic logo churn uses customers at the start, not an average that includes mid-period signups. That keeps “lost” compared to the base that could have churned for the full period.
Are my numbers stored?
No. Everything runs locally in your browser.
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