Understanding your churn rate results
These figures show churn from complementary angles — a single-period rate, its annualized projection, and the average lifetime it implies — each useful for different planning purposes.
| Metric | What it tells you |
|---|---|
| Monthly churn rate | The share of customers lost during the specific period measured. |
| Retention rate | The share of customers who remained through the period — the complement of churn rate. |
| Annualized churn rate | The cumulative effect of the monthly churn rate compounding over 12 months, assuming it stays constant. |
| Average customer lifetime | The expected average duration of a customer relationship implied by the churn rate, used as an input to customer lifetime value calculations. |
- Annualizing assumes the monthly churn rate stays constant across all 12 months — real churn often varies seasonally or changes as a customer base matures.
- This calculator measures customer-count churn (logo churn); it does not measure revenue churn, which can differ when lost customers have different average revenue than the overall base.
What is churn rate?
Churn rate is the percentage of customers who cancel, cease purchasing, or otherwise leave a business over a given period, most commonly measured monthly for subscription and SaaS businesses. It is one of the most closely watched health metrics for recurring-revenue businesses, since it directly affects customer lifetime value and the sustainability of growth.
Retention rate is the complement of churn rate — the percentage of customers who remained through the period — and the two figures always sum to 100%. A monthly churn rate can be projected into an annualized figure to show the cumulative effect of that same monthly rate compounding over 12 months, since a business does not lose the same customers twice but the surviving base shrinks each month.
The average customer lifetime implied by a churn rate is the mathematical inverse of the rate (1 ÷ churn rate, in months) — a common simplification used across SaaS metrics frameworks, including David Skok's SaaS Metrics 2.0, to translate a churn percentage into an expected relationship duration for use in customer lifetime value calculations.
How to use this churn rate calculator
- Enter the number of customers you had at the start of the period.
- Enter the number of customers lost (canceled or churned) during that same period.
- Read the monthly churn rate, retention rate, the annualized churn rate implied by compounding that monthly rate over 12 months, and the average customer lifetime in months.
The formula behind churn rate
Monthly churn rate is customers lost divided by customers at the start of the period, expressed as a percentage. For example, with 2,000 customers at the start and 40 lost during the month, monthly churn is 40 ÷ 2,000 = 2%, and retention is 100% − 2% = 98%.
Annualized churn compounds the monthly retention rate over 12 months and subtracts the result from 100%: 1 − (1 − 0.02)^12 ≈ 21.5%. This reflects that even a small monthly churn rate compounds meaningfully over a full year. Average customer lifetime is the inverse of the monthly churn rate: 100 ÷ 2 = 50 months in this example.
Common mistakes
- Confusing customer (logo) churn with revenue churn — a business can have low customer churn but higher revenue churn if larger customers are the ones leaving, or vice versa.
- Multiplying the monthly churn rate by 12 to estimate annual churn instead of compounding it, which understates the true annualized effect since retained customers are the base each subsequent month.
- Using an inconsistent starting customer count (e.g., mixing trial users with paying customers) between periods, which distorts the churn rate calculation.
- Treating a single month's churn rate as representative of the ongoing trend without checking for seasonality or one-time events (e.g., a pricing change) that may have driven an unusual spike.
Domande frequenti
How do you calculate monthly churn rate?
Monthly churn rate is calculated by dividing the number of customers lost during the month by the number of customers at the start of the month, then expressing the result as a percentage. Retention rate is simply 100% minus the churn rate.
What is a good churn rate for a SaaS business?
Benchmark churn rates vary by customer segment — businesses serving small customers with self-service signup commonly report higher monthly churn than businesses serving large enterprise customers with contracts, as reflected in industry surveys such as Bessemer Venture Partners' State of the Cloud reports. There is no single universal target; churn should be tracked against your own trend and segment-appropriate benchmarks.
Why is annualized churn so much higher than 12 times the monthly rate?
Annualized churn compounds the monthly retention rate across 12 periods rather than simply multiplying the monthly churn rate by 12, because each month's churn applies to a progressively smaller surviving customer base. This compounding effect means even a modest monthly churn rate, such as 2%, can produce a substantially higher annualized figure — around 21.5% in that example.
How does churn rate relate to customer lifetime value?
Churn rate is a direct input to customer lifetime value calculations — the standard simplified CLV formula divides gross-margin-adjusted revenue by churn rate, so a lower churn rate produces a higher expected lifetime value. The average customer lifetime this calculator reports (1 ÷ churn rate, in months) is the same figure used in that CLV formula.
Fonti
- Skok D. SaaS Metrics 2.0 — A Guide to Measuring and Improving What Matters. forEntrepreneurs.com.
- Bessemer Venture Partners. State of the Cloud / Cloud Index — SaaS benchmark metrics. bvp.com.
- Kotler P, Keller KL. Marketing Management. 15th ed. Pearson, 2016.