Startup runway & burn benchmarks (2025)
How many months until you run out of money? Calculate your runway and see if you are "default alive" or "default dead."
- 1.Enter Cash
- 2.Add Monthly Expenses
- 3.Subtract Revenue
- 4.Read Runway
- 5.Plan Fundraising
Key Takeaways
- →Under 6 months runway = crisis — start raising immediately or cut costs
- →Target 18-24 months post-raise to avoid negotiating from desperation
- →"Default alive" = revenue trajectory reaches profitability before cash runs out
- →Start fundraising at 9-12 months runway — raising takes 3-6 months
What is startup runway?
Runway is the number of months your startup can operate before running out of cash, assuming no additional funding.
Formula: Runway = Cash Balance ÷ Net Burn Rate
Net Burn: Net Burn = Monthly Expenses - Monthly Revenue
Example: $500,000 cash ÷ $50,000 net burn = 10 months runway
Runway is the single most important survival metric for early-stage startups. When runway hits zero, the company dies — regardless of product quality or market opportunity.
Startup runway benchmarks (2025)
| Runway | Risk Level | Assessment |
|---|---|---|
| < 6 months | Critical | Raise now or die |
| 6-9 months | High | Active fundraising required |
| 9-12 months | Moderate | Plan next raise |
| 12-18 months | Healthy | Standard post-raise runway |
| 18-24 months | Strong | Comfortable execution window |
| 24+ months | Excellent | "Default alive" territory |
Key Insight: VCs look for 18-24 months runway post-investment. If you raise with less than 6 months runway, you negotiate from weakness.
Gross burn vs. net burn
| Metric | Formula | What It Measures |
|---|---|---|
| Gross Burn | Total monthly expenses | Cost of operations |
| Net Burn | Expenses - Revenue | Cash consumption rate |
| Revenue | Monthly income | Partial offset to burn |
Example:
- Gross Burn: $100,000/month
- Revenue: $40,000/month
- Net Burn: $60,000/month
- Cash: $600,000
- Runway: 10 months
"default alive" vs. "default dead"
| Status | Definition | Action Required |
|---|---|---|
| Default Alive | Revenue growth trajectory reaches profitability before cash runs out | Control your destiny |
| Default Dead | Won't reach profitability before runway ends | Must raise or cut |
Paul Graham's Test: "If you're default dead, your primary goal should become making yourself default alive."
Why startups run out of runway (top 5 reasons)
1. raised too little
Taking a small round extends runway temporarily but puts you back in fundraising mode before hitting milestones.
2. burned too fast before product-market fit
Hiring aggressively before PMF is validated is the #1 startup killer. Stay lean until revenue proves the model.
3. overestimated revenue
Projecting $100K MRR in 12 months when you're at $10K today is fantasy. Base runway on conservative revenue scenarios.
4. ignored the fundraising timeline
Raising takes 3-6 months. Start when you have 9-12 months runway, not 3 months.
5. didn't adapt
When runway gets short, cut expenses. Most founders cut too late because they're emotionally attached to team and plans.
How to extend runway
| Strategy | Impact | Difficulty |
|---|---|---|
| Cut non-essential expenses | +20-40% runway | Low |
| Reduce headcount | +30-60% runway | High (emotional) |
| Defer founder salaries | +10-20% runway | Medium |
| Accelerate revenue | Variable | Depends on model |
| Raise bridge round | +6-12 months | Medium |
| Revenue-based financing | +6-12 months | Medium |
Runway by stage
| Stage | Typical Runway Post-Raise | Notes |
|---|---|---|
| Pre-Seed | 12-18 months | Lean team, low burn |
| Seed | 18-24 months | Build MVP, early traction |
| Series A | 18-24 months | Scale go-to-market |
| Series B+ | 24-36 months | Aggressive growth |
Frequently Asked Questions
FAQ
What is a "good" runway for a startup?
18-24 months post-raise. Minimum 12 months for healthy operations. Under 6 months is crisis territory.
When should i start fundraising?
When you have 9-12 months runway remaining. Raising takes 3-6 months; don't wait until you're desperate.
How do vcs evaluate runway?
They calculate if you can hit milestones before cash runs out. Short runway = weak negotiating position = worse terms.
Should i include revenue in runway calculations?
Yes, use net burn (expenses minus revenue). But be conservative — don't count revenue you haven't earned yet.
What's the difference between runway and burn rate?
Burn rate is how fast you spend money. Runway is how long that spending can continue given your cash balance.
Can i extend runway without raising?
Yes — cut expenses, defer salaries, accelerate revenue, or get bridge financing (debt, SAFE, revenue-based financing).
What happens when runway hits zero?
You can't make payroll. The company shuts down or gets acqui-hired for a fraction of its potential value.
Is 6 months runway enough to raise?
Very risky. You'll be negotiating from desperation, which leads to bad terms. Start at 9-12 months runway.