SaaS Metrics Calculator

What is this?

SaaS metrics are the key performance indicators that subscription businesses track to measure growth, retention, and unit economics. MRR (Monthly Recurring Revenue) and ARR (Annual Recurring Revenue) measure predictable income. Churn rate shows customer attrition. LTV (Lifetime Value) estimates total revenue from a customer. CAC (Customer Acquisition Cost) measures the cost to acquire one customer. The LTV:CAC ratio reveals whether growth is sustainable.

Why it matters

Investors evaluate SaaS businesses primarily through these metrics. A healthy LTV:CAC ratio (3x or higher) signals efficient growth. High churn (above 5% monthly) is a red flag. Understanding these numbers helps you identify where to invest in growth versus retention and makes fundraising conversations more productive.

How to use this calculator

Enter your current total customers, average monthly revenue per customer, new customers gained this month, customers lost to churn, and total marketing/sales spend. The calculator will compute all key SaaS metrics automatically. Tip: for a more accurate CAC, use a 3-month average of marketing spend rather than a single month.