The 10 SaaS Metrics Every Founder Must Track (And How They Connect)
MRR, ARR, churn, LTV, CAC, NRR, ARPU, payback period, gross margin, and burn rate — here's what each means, how they relate to each other, and which ones matter most at each stage.
The Metrics Map
SaaS metrics aren't isolated numbers — they form an interconnected system where each metric influences others. Understanding the relationships is more valuable than knowing any single metric.
The Core 10
1. MRR (Monthly Recurring Revenue)
Your operating heartbeat. MRR vs ARR — use MRR for operations, ARR for strategy and fundraising.
2. ARR (Annual Recurring Revenue)
MRR × 12. Your strategic metric. Milestone markers: $100K, $1M, $10M, $100M.
3. Churn Rate
Percentage of customers (logo churn) or revenue (revenue churn) lost monthly. The single most important metric to optimize for long-term growth.
4. ARPU (Average Revenue Per User)
Revenue per customer per month. Driven by your pricing strategy and tier mix. Often the most underoptimized lever.
5. LTV (Customer Lifetime Value)
Total revenue from an average customer. LTV = ARPU ÷ Monthly Churn. The numerator in the ratio that determines your business viability.
6. CAC (Customer Acquisition Cost)
Cost to acquire one customer. Calculate it accurately including salaries, tools, and ad spend. The denominator in LTV:CAC.
7. LTV:CAC Ratio
The unit economics verdict. Below 3:1 is dangerous. 3:1 to 5:1 is healthy. Above 5:1 means you should spend more on growth.
8. NRR (Net Revenue Retention)
Net revenue retention measures expansion vs contraction within your existing base. Above 100% means your customers compound in value.
9. CAC Payback Period
Months until a customer's revenue covers their acquisition cost. CAC ÷ ARPU. Target: under 12 months. Under 6 is excellent.
10. Gross Margin
(Revenue - COGS) ÷ Revenue. SaaS should be 70-85%. Below 70% suggests infrastructure or service costs are too high.
Which Metrics Matter When
| Stage | Primary Focus | Secondary |
|---|---|---|
| Pre-PMF ($0-100K ARR) | Churn, activation rate | MRR growth |
| Early growth ($100K-1M) | MRR growth, funnel conversion | CAC, unit economics |
| Scaling ($1M-10M) | NRR, LTV:CAC, burn rate | Gross margin, ARR growth |
| Established ($10M+) | NRR, gross margin, efficiency | Market share, Rule of 40 |
See Them All in One Place
The InnovexFlow Revenue Modeler calculates all 10 metrics from your inputs and projects them across 60 months. The dashboard shows the key metrics at a glance, while the data table and compare views let you drill into the details across all three scenarios.
For the complete framework on how these metrics flow into a financial model, start with our SaaS revenue model guide.