Reference
SaaS Metrics Reference
The 12 metrics that define SaaS health — formulas, industry benchmarks, and what each one actually tells you about the product and business. Written for founders and PMs who want precision, not a dashboard tutorial.
MRR
Monthly Recurring RevenueFormula
MRR = Sum of all active monthly subscription revenue
Key components
Benchmark
No universal benchmark — track MoM growth rate. Pre-PMF: 10-20% MoM is strong. Post-PMF: 5-10% MoM sustained is healthy.
What it tells you
The health of your revenue engine in real time. Tracking New, Expansion, and Churned MRR separately tells you whether growth is coming from acquisition or expansion, and where leakage is occurring.
ARR
Annual Recurring RevenueFormula
ARR = MRR × 12
Key components
Benchmark
$1M ARR is the traditional 'ramen profitability' milestone for SaaS. $10M ARR is when most investors consider a Series B conversation. $100M ARR is the threshold for late-stage growth metrics.
What it tells you
A normalized view of the revenue run rate useful for year-over-year comparisons, investor reporting, and headcount planning.
NRR
Net Revenue RetentionFormula
NRR = (Starting MRR + Expansion MRR - Churned MRR - Contraction MRR) / Starting MRR × 100
Key components
Benchmark
Best-in-class B2B SaaS: 120%+. Healthy: 100-120%. Warning zone: 90-100%. High risk: below 90%.
What it tells you
The single most diagnostic metric for product-market fit and long-term unit economics. VCs treat NRR as the most important metric in Series B and later diligence.
Churn Rate
Customer and Revenue ChurnFormula
Customer Churn = Customers lost in period / Customers at start of period × 100 Revenue Churn = MRR lost in period / MRR at start of period × 100
Key components
Benchmark
B2B SaaS monthly churn: below 1% is excellent, 1-2% is acceptable, above 2% is a retention problem that needs immediate diagnosis.
What it tells you
Where value delivery is breaking down. High churn in months 1-3 is an onboarding or ICP problem. High churn in months 6-12 is a product depth or competitive problem.
CAC
Customer Acquisition CostFormula
CAC = Total sales and marketing spend / Number of new customers acquired
Key components
Benchmark
The number alone is meaningless. Evaluate CAC relative to LTV. A healthy LTV:CAC ratio is 3:1 or higher. CAC payback period below 12 months is strong for SaaS.
What it tells you
The efficiency of your growth motion. Rising CAC with flat LTV means growth is getting more expensive without getting more valuable. The ideal trend is CAC declining as channels mature and brand compounds.
LTV
Lifetime ValueFormula
LTV = ARPU / Churn Rate (or: LTV = Average contract value × Average customer lifespan)
Key components
Benchmark
LTV:CAC of 3:1 or higher is the standard benchmark. Top-quartile SaaS companies reach 5:1 or more as distribution efficiency improves.
What it tells you
Whether the business can sustainably grow. High LTV relative to CAC means you can spend more on acquisition. Low LTV relative to CAC means you need to fix retention before scaling acquisition.
Activation Rate
Activation RateFormula
Activation Rate = Users who completed the activation event / Total new users × 100
Key components
Benchmark
Varies heavily by product type. Track your own activation-to-retention correlation first. A useful internal benchmark: activation rate for retained users vs churned users should diverge by 2x or more.
What it tells you
Whether new users are finding value before they leave. The highest-leverage early-stage metric because improving activation compounds across every new user cohort.
Day-N Retention
Cohort RetentionFormula
Day-N Retention = Users still active on Day N / Users who signed up on Day 0 × 100
Key components
Benchmark
B2B SaaS Day-30 retention: below 30% is concerning, 40-50% is solid, above 60% is top-quartile. Consumer products have lower benchmarks.
What it tells you
Whether users find lasting value in the product. The only metric that cannot be improved by acquisition spend alone — you have to make the product better.
ARPU
Average Revenue Per UserFormula
ARPU = Total MRR / Total active customers
Key components
Benchmark
Varies completely by market. SMB SaaS: $50-500/month ARPU is typical. Mid-market: $500-5,000. Enterprise: $5,000+.
What it tells you
The average monetization per customer. Useful for revenue projections and for understanding whether pricing and packaging is creating expansion behavior.
NPS
Net Promoter ScoreFormula
NPS = % Promoters (score 9-10) minus % Detractors (score 0-6)
Key components
Benchmark
Above 50 is excellent. Above 70 is world-class. Below 20 indicates significant product or experience problems.
What it tells you
A directional signal for overall customer sentiment. Useful as a leading indicator of churn and expansion. Limited by the fact that it does not explain what would change the score — always follow up NPS surveys with a qualitative reason.
CAC Payback Period
CAC Payback PeriodFormula
CAC Payback Period = CAC / (ARPU × Gross Margin %)
Key components
Benchmark
Below 12 months is excellent for B2B SaaS. 12-18 months is acceptable. Above 24 months requires either very high LTV or significant changes to acquisition efficiency.
What it tells you
How efficiently you convert acquisition spend into recovered investment. A long payback period with high churn is a terminal unit economics problem. A long payback period with low churn is a cash flow timing problem — different solutions required.
Magic Number
Sales Efficiency (Magic Number)Formula
Magic Number = (Current Quarter ARR - Previous Quarter ARR) / Previous Quarter Sales and Marketing Spend
Key components
Benchmark
Above 1.0 is excellent. 0.75-1.0 is solid. 0.5-0.75 means you should examine CAC by channel before scaling spend. Below 0.5 is a signal to fix the GTM before investing more.
What it tells you
Whether your sales and marketing investment is generating efficient ARR growth. The most direct measure of whether it is safe to add more fuel to the growth engine.
Have a take on how these metrics work in practice?
Benchmarks are starting points. How metrics behave in specific markets, stages, and business models is where the real insight is. Expert Perspectives is where practitioners publish that kind of first-hand analysis.