SaaS Runway Calculator: Burn Rate & Survival Simulator
Model cash balance depletion, net burn trajectory, revenue growth compounding, and Default Alive versus Default Dead milestones.
📊 Related Startup Tools: SaaS Pricing & MRR Simulator • Break-Even Calculator • HYSA Treasury Compound Yield
2026 SaaS Capital Efficiency Benchmarks
Industry-standard runway targets and Burn Multiples (Net Burn / Net New ARR) across funding stages.
| Startup Stage | Recommended Runway | Target Burn Multiple | Primary Survival Metric | Efficiency Rating |
|---|---|---|---|---|
| Bootstrapped / Self-Funded | Default Alive (Infinite) | < 0.5x (Net Positive) | Cash-Flow Positive | Exceptional |
| Pre-Seed / Angel Stage | 18 – 24 Months | 0.8x – 1.2x | Product-Market Fit (PMF) | Strong |
| Seed Stage ($1M–$3M Raised) | 20 – 24 Months | 1.0x – 1.5x | Repeatable CAC & Churn < 2% | Healthy |
| Series A ($5M–$15M Raised) | 24 – 30 Months | 1.5x – 2.0x | Net Revenue Retention (NRR > 115%) | Moderate |
| High-Burn / Venture Outlier | < 12 Months | > 2.5x | Emergency Down-Round / Bridge | High Risk |
Frequently Asked Questions
What is the difference between Gross Burn and Net Burn in SaaS?
Gross Burn represents your total monthly cash outlays (salaries, server hosting, marketing, and software tools). Net Burn subtracts incoming cash revenue (MRR) from Gross Burn. If your monthly operating expenses are $40,000 and your MRR is $15,000, your Net Burn is $25,000 per month.
What does 'Default Alive' vs 'Default Dead' mean?
Coined by Paul Graham, a startup is Default Alive if its projected revenue growth will reach cash-flow breakeven before its remaining treasury cash runs out. If existing cash will expire before reaching breakeven under current trajectory, the startup is Default Dead and requires immediate fundraising or expense reduction.
What is a healthy Burn Multiple for a SaaS startup in 2026?
Burn Multiple evaluates capital efficiency (Net Burn divided by Net New ARR added). In 2026, a Burn Multiple under 1.0x is elite, 1.0x to 1.5x is healthy, while anything exceeding 2.0x signals inefficient customer acquisition or bloated infrastructure.