FREE SAAS METRICS TOOL
Churn Calculator
Calculate customer churn, revenue churn, GRR, and NRR.
RETENTION WITHOUT ACQUISITION NOISE
Measure customer and revenue churn
Directional SaaS metrics only. Keep customer, MRR, expansion, contraction, and churn definitions consistent across periods. Currency selection changes formatting, not values.
THE BASICS
What is a churn calculator?
A SaaS churn calculator measures how much of the starting customer and recurring-revenue base was lost during a period. This tool keeps new acquisition separate so strong sales cannot disguise weak retention.
Use the same MRR definitions as the MRR Calculator and carry ending MRR into the ARR Calculator when you want an updated annual run rate.
Customer churn and retention formulas
Customer churn rate = churned customers ÷ starting customers × 100Customer retention rate = 100% − customer churn rateEnding customers = starting customers + new customers − churned customersCustomer churn is sometimes called logo churn. New customers change net growth and the ending count, but they do not reduce the churn rate for the starting cohort.
Revenue churn, GRR, and NRR formulas
Gross revenue churn = (contraction MRR + churned MRR) ÷ starting MRR × 100Net revenue churn = (contraction MRR + churned MRR − expansion MRR) ÷ starting MRR × 100GRR = 100% − gross revenue churnNRR = 100% − net revenue churnNew MRR is excluded from GRR and NRR because retention metrics evaluate the existing revenue base. Expansion can push NRR above 100%, but GRR cannot exceed 100%.
SaaS churn example
With 200 starting customers and 8 cancellations, customer churn is 4.00%. The revenue bridge produces 93.50% GRR and 101.00% NRR.
| Result | Result |
|---|---|
| Customer churn | 4.00% |
| Customer retention | 96.00% |
| Ending customers | 217 |
| Gross revenue retention | 93.50% |
| Net revenue retention | 101.00% |
| Ending MRR | $23,200.00 |
How founders should use churn metrics
Track customer churn and revenue retention together. Customer churn reveals account loss, while revenue retention shows whether the dollars leaving are concentrated in small or large customers and whether expansion offsets losses.
Segment by plan, acquisition channel, customer size, and cohort when aggregate churn hides important differences. Retention feeds directly into the LTV Calculator; compare that value with the CAC Calculator and revisit packaging in the SaaS Pricing Calculator.
COMMON QUESTIONS
Churn and retention questions
What is a good churn rate for SaaS?
There is no universal target. Churn varies by customer segment, contract length, price, company maturity, and whether you measure customers or revenue. Compare consistent cohorts and your own trend before relying on external benchmarks.
Should new customers be included in customer churn rate?
No. Standard customer churn divides customers lost from the starting base by customers at the start of the period. New customers belong in ending-customer and net-growth calculations.
What is the difference between gross and net revenue churn?
Gross revenue churn measures contraction plus churned MRR. Net revenue churn subtracts expansion MRR, so it can be negative when existing-customer expansion exceeds revenue losses.
What is the difference between GRR and NRR?
Gross revenue retention excludes expansion and cannot exceed 100%. Net revenue retention includes expansion from existing customers and can exceed 100%. Both exclude new-customer MRR.
Should I calculate churn monthly or annually?
Use the cadence that matches your contracts and decision-making, but label the period clearly. Do not multiply a monthly churn percentage by 12 to estimate annual retention; compounding requires a separate calculation.
How do reactivations affect churn?
Keep churn tied to the starting cohort. Treat reactivated customers and MRR consistently as reactivation or expansion in internal reporting, and document the choice so period comparisons remain meaningful.