Understanding SaaS Metrics: The Numbers Every Founder Must Know

If you’re building a SaaS business, there’s a set of metrics that you need to know cold — not just know, but obsess over. These metrics tell the story of your business better than any pitch deck, and investors who understand SaaS will expect you to have them at your fingertips.

Monthly Recurring Revenue (MRR) — the total predictable revenue your business generates each month from active subscriptions. This is the foundational metric of any SaaS business — the number that everything else is built on.

Annual Recurring Revenue (ARR) — your MRR multiplied by 12. Most SaaS businesses report and think in terms of ARR because it normalizes for monthly fluctuations and allows for easier year-over-year comparisons.

Churn Rate — the percentage of your customers or revenue that you lose each month. A 5% monthly churn rate means you lose 46% of your customers every year. Sustainable SaaS businesses have very low churn rates.

Customer Acquisition Cost (CAC) — how much does it cost you to acquire a new customer? This includes marketing spend, sales salaries, and any other costs directly tied to acquiring customers, divided by the number of customers acquired in a period.

Customer Lifetime Value (LTV) — the total revenue you expect to generate from a customer over their entire relationship with your business.

LTV:CAC Ratio — the relationship between LTV and CAC. A healthy SaaS business typically has an LTV:CAC ratio of at least 3:1 — meaning for every rupee spent acquiring a customer, you expect to generate at least three rupees in lifetime value.

Net Revenue Retention (NRR) — the percentage of revenue retained from your existing customers, accounting for churn, downgrades, and expansions. An NRR above 100% means your existing customers are growing in value even as some churn — one of the best indicators of a healthy SaaS business.

Payback Period — how long does it take to recover your CAC? The shorter the payback period, the less capital-intensive your growth is. At WeSolve, we help SaaS founders build the dashboards and reporting systems to track these metrics and use them to make better decisions.