How to Calculate SaaS Metrics (2026)
By Rui Barreira · Last updated: 18 June 2026
SaaS metrics measure whether a subscription business is growing efficiently. Unlike e-commerce, where revenue is transactional, SaaS revenue is recurring — so the key numbers track how reliably customers stay, how much they spend over time, and whether acquisition costs are sustainable. The SaaS Metrics Calculator computes all of these from a handful of inputs.
The Core Metrics and How to Calculate Them
Monthly Recurring Revenue (MRR) is the foundation. Take the number of active paying customers and multiply by the average revenue per account per month. Annual Recurring Revenue (ARR) is simply MRR × 12. Churn rate is the percentage of MRR or customers lost in a given month: divide lost MRR by starting MRR. Customer Lifetime Value (LTV) is the average revenue a customer generates before churning — calculated as ARPU ÷ churn rate. Customer Acquisition Cost (CAC) divides total sales and marketing spend by the number of new customers acquired in the same period.
| Metric | Formula | Healthy benchmark |
|---|---|---|
| MRR | Customers × ARPU | Varies by stage |
| Churn rate | Lost MRR ÷ Starting MRR | < 2% monthly |
| LTV | ARPU ÷ Monthly churn rate | > 3× CAC |
| CAC | S&M spend ÷ New customers | LTV payback < 12 months |
| LTV:CAC ratio | LTV ÷ CAC | 3:1 or higher |
| CAC payback period | CAC ÷ (ARPU × gross margin) | < 12 months |
Why the LTV:CAC Ratio Matters Most
A ratio below 1 means you lose money on every customer — the business is structurally unprofitable regardless of growth rate. A ratio between 1 and 3 is marginal; it may work with tight operational efficiency but leaves little room for error. Above 3 is the standard benchmark for a healthy SaaS business. Above 5 often signals underinvestment in growth — you could afford to acquire more aggressively. The ratio should be read alongside CAC payback period: a 4:1 LTV:CAC with a 24-month payback still creates a cash flow problem for early-stage companies.
Expansion MRR and Net Revenue Retention
Churn rate alone understates customer health in businesses with upsell or seat-based pricing. Net Revenue Retention (NRR) captures this: starting MRR plus expansion MRR minus churned MRR, divided by starting MRR. An NRR above 100% means your existing customer base is growing even without new logo acquisition — the strongest signal of product-market fit in B2B SaaS. Best-in-class companies like Snowflake and Datadog have sustained NRR above 130%. Track expansion MRR separately from new business MRR to understand which growth lever is doing the work.
Use the SaaS Metrics Calculator to do this instantly.
Frequently Asked Questions
- Is this tool free?
- Yes — completely free, no signup required. All processing happens in your browser.
- Does the tool work offline?
- Once loaded, most features work without an internet connection since everything runs client-side.