ARR vs MRR: What's the Difference and Which One Should You Track?
ARR and MRR are not the same. This guide explains the key differences, when to use each metric, and how investors interpret them.
If you've spent any time in SaaS, you've seen MRR and ARR used interchangeably. They're not the same thing — and using the wrong metric at the wrong time can lead to bad decisions.
This guide breaks down the difference, when to use each, and how investors evaluate them.
What Is MRR?
Monthly Recurring Revenue (MRR) is the normalized monthly revenue you expect from active subscriptions. It's the heartbeat metric for any SaaS business.
How to Calculate MRR
MRR = Number of Paying Customers × Average Revenue Per Account (ARPA)
If you have 100 customers paying an average of $50/month:
100 × $50 = $5,000 MRR
MRR includes:
- Monthly subscription fees
- Recurring add-ons and seat charges
- Discounted annual plans normalized to monthly
MRR excludes:
- One-time setup fees
- Professional services
- Overages and usage-based billing
What Is ARR?
Annual Recurring Revenue (ARR) is simply MRR × 12. It represents the annualized run-rate of your subscription revenue.
ARR = MRR × 12
If your MRR is $5,000, your ARR is $60,000.
ARR is the standard metric for:
- Fundraising decks and investor updates
- Board reporting and annual planning
- Valuing the business (SaaS companies are typically valued at 5–15× ARR)
When ARR Can Be Misleading
ARR assumes zero growth over the year. If you're growing 10% month-over-month, your current ARR dramatically understates where you'll be in 12 months. That's why growth-stage companies report ARR alongside growth rate.
Key Differences: ARR vs MRR
| Aspect | MRR | ARR |
|---|---|---|
| Timeframe | Monthly view | Annualized view |
| Best for | Day-to-day operations | Fundraising, valuation |
| Sensitivity | Captures monthly changes quickly | Smoothes out monthly noise |
| Investor relevance | Operational metric | Standard reporting metric |
| Typical range | $0–$100K+ for early stage | $10K–$10M+ for growth stage |
When to Track Each
Track MRR Daily When:
- You're pre-seed to Series A
- Your ARR is below $2M
- You're iterating on pricing and packaging
- You need early warning signals on churn
Track ARR Monthly When:
- You're Series A and beyond
- You're preparing for fundraising
- Reporting to a board of directors
- Comparing your business to public SaaS comps
The Hybrid Approach
Most sophisticated SaaS founders track both:
- MRR for weekly pulse checks and operational decisions
- ARR for monthly reporting and investor communication
Net New MRR (new + expansion - churned) is the metric that ties them together. If your Net New MRR is positive and growing, both MRR and ARR will follow.
What Investors Look For
When investors evaluate your MRR and ARR, they focus on three things:
- Growth rate — Is ARR growing at 100%+ year-over-year?
- Efficiency — What's your magic number (new ARR / sales & marketing spend)?
- Retention — What's your net revenue retention (NRR)?
A company with $500K ARR growing 15% month-over-month is more interesting than one with $2M ARR growing 5%. Growth rate matters more than absolute ARR at the early stage.
Track Your Revenue Metrics with AI Finance Ops
Stop calculating MRR and ARR in spreadsheets. AI Finance Ops automatically tracks your recurring revenue, churn, and growth metrics in real time — with AI-powered insights on what's driving changes.
Start your 14-day free trial today.
Track Your SaaS Metrics for Free
AI Finance Ops automatically tracks MRR, churn, runway, and more.
Start Free Trial