SaaS Metrics: The Numbers That Define a SaaS Business
SaaS metrics are the language of software businesses. An 11-metric dictionary with formulas and explanations, the three metrics that predict SaaS success, and how to implement metric tracking in Bubble.io without live database queries.
The Numbers That Define a SaaS Business
SaaS metrics are the language of software-as-a-service businesses. They allow founders, investors, and operators to evaluate business health, identify problems early, and make data-driven decisions. A SaaS company that does not track its key metrics is flying blind. A SaaS company that tracks vanity metrics (total signups, page views) instead of business metrics (MRR, churn rate, NRR) is flying with the wrong instruments. This guide covers every metric that matters, what it tells you, and how to implement it in a Bubble.io SaaS product.
Every Metric You Need to Know
| Metric | Abbreviation | Formula | What It Tells You |
|---|---|---|---|
| Monthly Recurring Revenue | MRR | Sum of all active monthly subscriptions | Total recurring revenue; business scale |
| Annual Recurring Revenue | ARR | MRR x 12 | Annualised business scale |
| Monthly Churn Rate | Churn | Lost customers this month / Start customers x 100 | Customer retention; product stickiness |
| Net Revenue Retention | NRR | (Start MRR + Expansion – Contraction – Churn) / Start MRR | Whether existing customers grow their spend |
| Customer Acquisition Cost | CAC | Sales + Marketing spend / New customers | Acquisition efficiency |
| Lifetime Value | LTV | Average MRR / Monthly churn rate | Expected revenue per customer |
| LTV/CAC Ratio | LTV:CAC | LTV / CAC | Acquisition efficiency benchmark (target: >3x) |
| Average Revenue Per User | ARPU | Total MRR / Total active customers | Revenue per customer |
| Trial to Paid Conversion | Conversion | Paid customers / Trial starts x 100 | Onboarding effectiveness |
| Daily Active Users | DAU | Unique users active in last 24 hours | Product engagement |
| Payback Period | Payback | CAC / (ARPU x gross margin) | Months to recover acquisition cost |
If You Track Nothing Else, Track These
MRR (Monthly Recurring Revenue)
MRR is the foundational SaaS metric. Track it weekly. If it is growing: understand why and replicate it. If it is declining: find the churn source immediately. Every other metric ultimately connects back to its impact on MRR.
Monthly Churn Rate
Churn is the most important health metric. A churn rate above 5% monthly means your SaaS is structurally unsustainable at any growth rate. Below 2%: healthy. Below 1%: best-in-class. Track churn by cohort to identify which customer types and acquisition channels produce the best retention.
Net Revenue Retention (NRR)
NRR above 100% means your existing customers spend more over time than you lose to churn — meaning your business grows even without acquiring new customers. This is the hallmark of elite SaaS businesses. Track NRR monthly. A rising NRR signals product-market fit; a falling NRR signals either rising churn or insufficient expansion.
Free SaaS Tech Audit — 30 Minutes, No Cost
Athar Ahmad personally reviews your SaaS product. Security vulnerabilities, billing gaps, performance problems — identified and prioritised before they cost you customers or deals.
- Multi-tenant security and privacy rule audit
- Stripe billing architecture review
- Performance bottleneck identification
- Written remediation roadmap within 24 hours
Q: What is the most important SaaS metric for investors?
For early-stage investors: MRR growth rate. For Series A investors: NRR. For growth investors: LTV/CAC ratio and payback period. The metrics that matter shift as the business matures from finding product-market fit to scaling efficiently.
Q: How do I implement SaaS metric tracking in Bubble.io?
Store all metrics as denormalised number fields on the Workspace record (per-customer metrics) and a GlobalStats record (platform-wide metrics). Update them via workflows triggered by state changes (new subscription, cancellation, upgrade, payment success). Display them in an admin dashboard that reads stored numbers rather than running live queries.
Q: What is a healthy LTV/CAC ratio for SaaS?
The benchmark is 3:1 or higher. If your average customer is worth $3,000 (LTV) and costs $1,000 to acquire (CAC), your LTV/CAC ratio is 3:1. Below 3:1: you are spending too much to acquire customers relative to what they are worth. Above 5:1: you may be underinvesting in growth.
Build or Fix Your SaaS. Start Here.
Free Tech Audit for existing SaaS products. Discovery Sprint to scope new ones. Both lead to better outcomes than building without architecture.
