VC & PE Glossary
What Is SaaS Metrics?
Updated
Definition
SaaS metrics are the standard measures subscription software companies use to track growth, retention, efficiency, and unit economics — ARR, churn, NRR, CAC payback, and related KPIs.
Useful for: Founders, Investors
SaaS metrics are the recurring-revenue KPIs investors and operators use to judge subscription software businesses.
How it works
Core set:
- ARR / MRR: Annual or monthly recurring revenue from subscriptions — exclude one-time services unless clearly separated.
- Growth: YoY ARR growth rate; net new ARR per quarter.
- Churn: Logo and revenue churn; NRR (net revenue retention) captures expansion.
- Efficiency: CAC, CAC payback, LTV:CAC, magic number (net new ARR ÷ S&M spend).
- Profitability proxies: Gross margin, Rule of 40, burn multiple.
Example board slide: $12M ARR, 45% YoY growth, 115% NRR, 18-month CAC payback, 78% gross margin — tells a growth-efficiency story beyond headline revenue.
Define metrics once in the data room and use the same logic in S-1 if you go public — restatements hurt credibility.
Why it matters
- Founders: Pick north-star metrics aligned to stage — early teams emphasize retention curves; scale-ups emphasize efficiency.
- Investors: Benchmark against sector peers; inconsistent definitions are a diligence yellow flag.
Common mistake
Reporting bookings or TCV as ARR. Multi-year prepaid contracts and one-time fees inflate numbers that are not recurring.
Related ideas
See also Rule of 40, revenue churn, CAC payback, and retention curve.
Related terms
- Revenue Churn — Revenue churn is the recurring revenue lost from existing customers in a period — through cancellations, downgrades, or non-renewals — usually measured as a percentage of starting ARR or MRR.
- Rule of 40 — The Rule of 40 is a SaaS benchmark stating that revenue growth rate plus profit margin should exceed 40% — a shorthand for balancing growth and profitability at scale.
Common questions
Short answers for founders, LPs, and operators