SaaS

Subscription Churn Rate Calculator

Calculate customer churn rate from the number of customers lost during a period and the starting customer base.

Last reviewed: April 30, 2026Free toolMethodology

Subscription Churn Rate Calculator

These fields start with sample inputs. Keep them or replace them, then run the tool to show a fresh result.

Number fields accept plain values and common formatted input such as 250000, 250,000, or 1,234.56.

Result

Calculating the sample result.

Why it matters

Churn is one of the most important recurring revenue metrics because it directly shapes LTV, growth quality, and retention efficiency.

When to use

  • Reviewing monthly retention performance
  • Comparing segments or plans
  • Supporting LTV and retention analysis

Inputs & Outputs

Inputs

  • Starting customers are the customers at the beginning of the measurement period.
  • Customers lost are the paying customers that churned during the same period.

Outputs

  • Churn rate shows the percentage of the starting base lost during the period.
  • Retention remainder shows the share of the starting base that stayed.

Customer churn formula

Divide customers lost by starting customers and express the result as a percentage.

Churn rate = customers lost / starting customers

Worked example

1

Monthly retention review

A product began the month with 2,400 customers and lost 72 of them.

Inputs

  • Starting customers: 2,400
  • Customers lost: 72

Steps

  • Churn = 72 / 2,400 = 3%

Result

  • Monthly customer churn is 3%.

Edge cases & caveats

  • Choose a consistent churn definition across plans and billing cadences.
  • Logo churn and revenue churn can tell very different stories.

Frequently Asked Questions

Why should churn use the starting customer base?

Because the starting base is the pool actually at risk of churning during the period.

Should new customers be included in the denominator?

Not in the standard starting-base churn formula. They affect ending customers, not the initial at-risk base.

Keep going

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