What is the Churn Rate Calculator?
The Churn Rate Calculator shows the percentage of customers a business loses during a period, such as monthly or annually. It is essential for subscription businesses because retention directly drives growth and unit economics.
How does it work?
Enter the number of customers you had at the start of the period and how many customers you lost during that period. The calculator turns that relationship into a percentage.
Formula
(customers lost / customers at start) x 100
How the calculation works
How the calculation works
- 1Start with the number of customers at the beginning of the period.
- 2Count how many customers cancelled or were lost during the period.
- 3Divide customers lost by the starting customer count.
- 4Multiply by 100 to express the result as a churn rate percentage.
Worked example
Worked Example
Lantern Labs, a fictional SMB SaaS company, starts August with 1,000 customers and 55 of them cancel their subscriptions during the month. The team wants to know its monthly logo churn rate.
- 1Divide customers lost by customers at start: 55 / 1000 = 0.055
- 2Multiply by 100 to convert to a percentage: 0.055 x 100 = 5.5%
- 3Lantern Labs lost 55 of 1,000 customers, leaving 945 active
Result
Lantern Labs has a monthly churn rate of 5.5%, meaning 5.5% of its customer base cancelled during the month, a level that warrants retention work.
Interpretation guide
How to read your result
World-class retention typical of enterprise SaaS where accounts are few, large, and deeply integrated.
Keep the discipline that drives retention and invest savings from churn reduction into expansion.
Healthy churn for SMB SaaS, supporting strong LTV and reliable growth forecasts.
Protect this level with onboarding, health scoring, and proactive customer success outreach.
In line with the broad SaaS average, but churn at this level eats into growth and LTV meaningfully.
Diagnose where churn concentrates: segment by plan, cohort, and onboarding completion before acting.
Churn is high enough to undermine growth and LTV, a common pattern when product-market fit or onboarding is weak.
Treat this as an emergency: fix onboarding, survey churned customers, and reassess whether the product matches the segment.
Benchmarks
Monthly logo churn benchmarks by segment (annual churn shown as reference)
| Metric | Typical | Strong |
|---|---|---|
| Enterprise SaaS | 0.5-1% | Under 0.5% |
| SMB SaaS | 1-2% | Under 1% |
| Average SaaS | 2-5% | Under 2% |
| Annual churn | 10-20% | 5-7% |
Common mistakes
- - Using the wrong denominator by comparing against ending customers
- - Ignoring seasonality in customer behavior
- - Treating one-time churn spikes as permanent trends
Practical tips
Practical tips
Always use customers at the start of the period as the denominator; comparing against ending customers understates churn.
Track logo churn and revenue churn separately, since losing one large account hurts more than losing several small ones.
Convert monthly churn to annual retention with (1 - monthly churn)^12 to model how retention compounds.
Churn early customers the most, so measure churn by onboarding cohort rather than company-wide to spot the real problem.
Count involuntary churn such as failed payments separately from voluntary cancellations; the fixes are completely different.
Pair churn with CAC and LTV: at 5.5% monthly churn, payback periods lengthen and acquisition budgets must shrink.
When should you use it?
- - Tracking retention health monthly
- - Reviewing product onboarding and support issues
- - Comparing cohorts across time periods
- - Preparing SaaS growth or investor reports
Benefits
- - Highlights retention problems quickly
- - Supports more accurate forecasting
- - Helps prioritize customer success and product fixes
Use cases
- - Subscription analytics
- - Customer success reviews
- - SaaS forecasting
Step-by-step example
Identify the customer count at the start of the reporting period. Count the customers lost over that period. Divide customers lost by the starting count and multiply by 100 to get the churn rate.
Real-world example
A SaaS company starts the month with 1,000 customers and loses 55 during the month. Its monthly churn rate is 5.5%, meaning about 5.5% of the customer base was lost during that month.