Business5 min read

SaaS Metrics

Master SaaS metrics - MRR, ARR, churn, NRR, CAC, LTV, and the KPIs investors and operators use to evaluate SaaS health.

SaaSMetricsMRRChurnNRRCAC

skill: SaaS Metrics category: Business tags: [SaaS, Metrics, MRR, Churn, NRR, CAC] readingTime: 5

SaaS metrics are the language of SaaS companies. Every operator needs to know MRR, churn, NRR, and CAC cold - these numbers tell you if your business is healthy, growing, and investable. Don't just track them; understand the levers that move them.

Workflow

Track MRR and ARR correctlyMRR (Monthly Recurring Revenue) is the foundation metric. Tracking it correctly - including expansions, contractions, and churn - reveals revenue health.
Measure churn and net revenue retentionChurn determines ceiling growth. High churn means you're filling a leaky bucket - acquiring customers faster than you're losing them. NRR > 100% means the bucket fills itself.
Calculate CAC and payback periodCAC and payback period tell you how efficient your go-to-market is. Low CAC with short payback = efficient growth. High CAC with long payback = risky, capital-intensive.
Track LTV and LTV:CAC ratioLTV tells you the total value a customer generates. LTV:CAC determines whether your business model is economically sound.
Apply the Rule of 40 for overall healthRule of 40 balances growth and profitability - a SaaS can sacrifice profitability for growth, or vice versa, but their sum should exceed 40%.

Output Format

SaaS metrics: MRR waterfall (new+expansion-contraction-churn), NRR > 100% target, CAC payback < 12 months, LTV:CAC > 3, Rule of 40 > 40, and Burn Multiple < 1.

MRR waterfall: new + expansion - contraction - churned
NRR: (start + expansion - contraction - churned) / start × 100
CAC: S&M spend / new customers acquired in period
Payback: CAC / (monthly rev × gross margin)
Rule of 40: growth% + profit margin% >= 40

Examples

Input

Output

Edge Cases & Gotchas

Annual vs. monthly plan MRR - A $1,200 annual contract contributes $100/month to MRR, not $1,200 - it's the monthly equivalent. Don't confuse cash received (annual prepayment) with recognized MRR.
Usage-based pricing MRR - For usage-based SaaS (AWS, Stripe), MRR varies monthly. Use trailing 3-month average to smooth volatility. Track P50 and P90 customer spend separately.
Gross margin composition - For SaaS, COGS includes: hosting (AWS/GCP), support team salaries, customer success, and payment processing fees. Higher gross margin (80%+ for pure SaaS) supports higher valuations.
Cohort vs. blended metrics - Blended NRR can mask deteriorating cohorts if new cohorts are larger. Track NRR by acquisition cohort to detect if product value is declining for specific customer segments.

When to Break These Rules

Focus on leading indicators (daily active use, feature adoption) over lagging indicators (MRR, churn) in the very early stage - before you have enough data for statistically significant SaaS metrics.
Use different metrics for usage-based businesses - seats don't apply to API billing. Track revenue per unit of consumption (API call, GB processed) instead of per-seat metrics.

Reference Files

https://www.saastr.com/saas-metrics/
https://www.key.io/blog/saas-metrics-cheat-sheet