SaaS Metrics & Startup Runway Calculator
Simulate monthly recurring revenue (MRR), annual recurring revenue (ARR), cash burn rate, runway months, zero cash date, and unit economics (LTV:CAC).
Startup Cash Burn & Runway Simulator
Total liquid cash reserves in bank accounts.
Estimated Runway
16.7 Months
Net Burn: -$15,000 / mo
With $250,000 cash and -$15,000 net burn, your startup has approx. 16.7 months of runway.
Net Burn Rate
-$15,000 / mo
Zero Cash Date
Dec 2027
Comprehensive Guide to SaaS Financial Metrics & Startup Runway Optimization
Subscription Software-as-a-Service (SaaS) businesses rely on recurring revenue predictability, unit economics, and cash burn efficiency. Tracking key SaaS performance indicators (KPIs) ensures capital efficiency and investor confidence.
1. Key SaaS Financial Metric Formulas
Monthly Recurring Revenue (MRR):
MRR = Total Active Subscribers × Average Revenue Per User (ARPU)
Net New MRR:
Net New MRR = (New MRR + Expansion MRR) - (Churned MRR + Contraction MRR)
Customer Lifetime Value (LTV):
LTV = (ARPU × Gross Margin %) / Monthly Churn Rate %
CAC Payback Period (Months):
Payback Months = CAC / (ARPU × Gross Margin %)
MRR = Total Active Subscribers × Average Revenue Per User (ARPU)
Net New MRR:
Net New MRR = (New MRR + Expansion MRR) - (Churned MRR + Contraction MRR)
Customer Lifetime Value (LTV):
LTV = (ARPU × Gross Margin %) / Monthly Churn Rate %
CAC Payback Period (Months):
Payback Months = CAC / (ARPU × Gross Margin %)
2. Startup Runway & Burn Rate Benchmark Rules
| Runway Buffer | Health Status | Recommended Action |
|---|---|---|
| > 18 Months | Healthy Capital Buffer | Focus on aggressive product-led growth & expansion. |
| 12 – 18 Months | Normal Fundraising Window | Prepare investor pitch deck & start venture outreach. |
| 6 – 12 Months | Warning Zone | Implement cost optimization & freeze non-critical hiring. |
| < 6 Months | Critical Cash Emergency | Execute emergency survival plan or bridge financing. |