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Free SaaS retention calculator

SaaS Churn Rate Calculator

Calculate customer churn, customer retention, gross revenue churn, gross revenue retention, and net revenue retention for one reporting period.

✓No signup required✓Transparent cohort formulas✓New-customer revenue excluded from NRR

Starting-customer cohort

Enter your customer and MRR data

Use one consistent period. Customer metrics and revenue metrics can be calculated together or separately.

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Cohort result

Your retention snapshot

%
Enter your cohort data

Your customer and revenue retention results will appear here.

Customer churn rate—Lost ÷ starting customers
Customer retention rate—Remaining ÷ starting customers
Gross revenue churn—Churned + contraction MRR
Gross revenue retention—Expansion and reactivation excluded
Net revenue retention—Expansion and reactivation included; new MRR excluded
Calculation note: Revenue retention follows the customers active at the start of the period. It excludes revenue from customers acquired during the period.

Calculation breakdown

How your results were calculated

MetricFormulaResult
Enter your values and calculate to see the breakdown.

What Is SaaS Churn?

Churn measures customers or recurring revenue lost during a defined period. Customer churn tracks lost accounts. Revenue churn tracks lost recurring revenue, so downgrades can affect it even when a customer remains active.

How the Calculator Works

Customer Churn Rate = Churned Customers ÷ Starting Customers × 100
Customer Retention Rate = (Starting Customers − Churned Customers) ÷ Starting Customers × 100
Gross Revenue Churn = (Churned MRR + Contraction MRR) ÷ Starting MRR × 100
GRR = (Starting MRR − Churned MRR − Contraction MRR) ÷ Starting MRR × 100
NRR = (Starting MRR + Expansion MRR + Reactivation MRR − Churned MRR − Contraction MRR) ÷ Starting MRR × 100

Customer Churn, GRR, and NRR

Customer churn and retention

Customer churn gives every lost customer equal weight, regardless of account size. Customer retention is the share of starting customers that remain at the end of the period.

Gross revenue retention

GRR measures recurring revenue retained after cancellations and downgrades. It excludes expansion and reactivation revenue, so it cannot exceed 100% under this formula.

Net revenue retention

NRR adds expansion and reactivation from the starting cohort before subtracting churn and contraction. It can exceed 100% when those gains are greater than the recurring revenue lost.

Cohort rule: Keep new customers and their revenue out of these retention calculations. Compare the same starting cohort through the full reporting period.

Important Limitations

This calculator does not judge whether a churn rate is good or bad. Appropriate targets vary by customer segment, contract length, business model, company stage, and reporting method. It also assumes that churned MRR and contraction MRR do not overlap.

Frequently Asked Questions

How do you calculate customer churn rate?

Divide the number of customers lost during the period by the number of customers at the start of the period, then multiply by 100.

What is customer retention rate?

Customer retention rate is the percentage of starting customers that remain at the end of the period. In this simple cohort calculation, it equals 100% minus customer churn rate.

What is gross revenue churn?

Gross revenue churn is churned MRR plus contraction MRR divided by starting MRR. It measures recurring-revenue losses without offsetting them with expansion or reactivation.

What is the difference between GRR and NRR?

GRR excludes expansion and reactivation revenue. NRR includes both from the starting customer cohort while still subtracting churned and contraction MRR.

Can NRR exceed 100%?

Yes. NRR exceeds 100% when expansion and reactivation MRR are greater than churned and contraction MRR.

Should new-customer revenue be included in NRR?

No. This cohort-based NRR formula follows customers active at the start of the period and excludes revenue from customers acquired during the period.

Methodology Sources

Definitions and formulas were checked against Stripe’s churn-rate guide, ChartMogul’s NRR guide, ChartMogul’s GRR guide, and Paddle’s revenue-churn guide.

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