Free calculators for every SaaS KPI — MRR, ARR, churn, LTV/CAC, Rule of 40, burn multiple, and NRR. No signup required.
All-in-one: MRR, ARR, churn, LTV/CAC, NRR, Rule of 40 in one form
Calculate monthly and annual recurring revenue with growth rate & quick ratio
Customer churn, revenue churn, annualized rates, and implied LTV
Customer lifetime value vs acquisition cost — the key SaaS efficiency metric
Growth rate + profit margin benchmark for investor conversations
Capital efficiency: how many dollars burned per dollar of net new ARR
NRR & GRR from expansion, contraction, and churn
| Stage | Most Important Metric | Why |
|---|---|---|
| Pre-Revenue | Burn Multiple | How efficiently are you converting capital into product? |
| $0-$100K ARR | MRR Growth Rate | Speed of early traction is everything at this stage |
| $100K-$1M ARR | Churn Rate | Leaky bucket kills growth; fix retention before scaling CAC |
| $1M-$10M ARR | LTV:CAC Ratio | Proves unit economics work before raising Series A/B |
| $10M+ ARR | NRR | NRR >120% means growth self-compounds from existing customers |
| Pre-IPO / Public | Rule of 40 | Primary public market valuation benchmark for SaaS multiples |
| Metric | Early Stage | Growth Stage | World Class |
|---|---|---|---|
| MoM MRR Growth | 10-20% | 5-10% | 15%+ |
| Revenue Churn | <8% | <4% | <2% |
| NRR | 100%+ | 110%+ | 130%+ |
| LTV:CAC | 3:1 | 5:1 | 10:1+ |
| Rule of 40 | 40+ | 50+ | 60+ |
| Burn Multiple | <2x | <1.5x | <1x |
Need to calculate SaaS metrics programmatically? The 61tools Financial API accepts raw inputs and returns all KPIs in JSON. Free tier: 100 req/day.
Get API Key →Customer lifetime value vs acquisition cost ratio
Customer & revenue churn with annualized rates
Social Security + Medicare — employee & employer
Is your W-4 withholding too much or too little?