SaaS Metrics Explained: MRR, ARR, Churn and NRR
Unicorn Rivals Team
Why SaaS Metrics Matter Early
Subscription businesses live on recurring revenue and retention. Vanity metrics (total signups, page views) feel good; MRR and churn tell you if the company survives.
You don't need a data team on day one — a spreadsheet and weekly discipline beat a fancy dashboard with wrong definitions.
Pair this with unit economics and churn basics. For runway, see burn rate.
MRR (Monthly Recurring Revenue)
MRR = normalized monthly subscription revenue from active paying customers.
Include:
- Monthly plans at face value
- Annual plans ÷ 12
- Consistent usage tiers (if predictable)
Exclude:
- One-time setup fees
- Professional services (track separately)
- Uncollectible churned revenue
Example: 50 customers × $100/mo + 10 annual at $1,200/yr → MRR = $5,000 + $1,000 = $6,000.
ARR (Annual Recurring Revenue)
ARR = MRR × 12 (for pure subscription SaaS).
Investors quote ARR in pitches. Founders should still operate on MRR — bills are monthly.
Rule of thumb: don't celebrate ARR if MRR is flat and churn is high.
Churn (Logo and Revenue)
Logo churn = customers lost ÷ customers at start of period.
Revenue churn = MRR lost (including downsells) ÷ starting MRR.
| Monthly logo churn | Rough annual survival |
|---|---|
| 2% | ~79% of logos remain |
| 5% | ~54% |
| 10% | ~28% |
Fix churn before scaling acquisition — full guide: reduce churn.
NRR (Net Revenue Retention)
NRR = (Starting MRR + expansion − churn − contraction) ÷ Starting MRR.
NRR > 100% means existing customers grow faster than they leave — the holy grail for B2B SaaS.
Early stage: NRR is noisy with 20 customers. Still track expansion vs contraction stories qualitatively.
Weekly Founder Dashboard (Minimum)
| Metric | Formula / source |
|---|---|
| MRR | Stripe + manual adjustments |
| New MRR | New logos × price |
| Churned MRR | Cancellations + downsells |
| Net new MRR | New − churned |
| Active paying logos | Count |
| Logo churn % | Lost logos ÷ start logos |
Review every Monday. One page. No exceptions.
Metrics Investors Ask First
- MRR growth rate (month over month)
- Churn / NRR
- CAC payback (unit economics)
- Runway (calculator)
- Concentration risk (one customer = 40% MRR?)
Honest numbers beat hockey-stick screenshots.
Common Mistakes
| Mistake | Fix |
|---|---|
| Counting all cash as MRR | Separate services |
| Ignoring annual prepay in monthly view | Normalize ÷ 12 |
| Celebrating signups, ignoring activation | Core action completion |
| Delayed churn recognition | Cancel = immediate MRR hit |
Feel Metrics Under Pressure
MRR up, churn silent, runway shrinking — founders feel this tension constantly. A startup sim compresses those loops into evening sessions.
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