Calculate the most important SaaS metrics in one place. Enter your MRR, churn, expansion, and customer data to get ARR, net MRR growth, churn rate, LTV, LTV:CAC ratio, and Rule of 40 score.
Inputs
Total recurring revenue billed monthly.
MRR from new customers acquired this month.
MRR lost from customers who cancelled this month.
Additional MRR from existing customers (upgrades, add-ons).
Total number of paying customers at the end of the month.
Average cost to acquire one new customer.
Results
ARR
$1,200,000
How to use
Enter your current Monthly Recurring Revenue (MRR).
Enter new, churned, and expansion MRR for the month.
Enter your total customer count and average CAC.
Review ARR, growth, churn, LTV, LTV:CAC, and Rule of 40 metrics.
Guidance
These metrics paint a comprehensive picture of SaaS health. ARR is the top-line growth indicator. Net MRR growth shows monthly momentum. Churn rate should be below 5% monthly (ideally under 2%). LTV:CAC ratio of 3:1 or higher indicates sustainable unit economics. The Rule of 40 (growth rate + profit margin) above 40 signals a healthy, investable business. Track these metrics monthly and look for trends rather than isolated numbers.
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