Runway
Runway is how many months a startup can operate before running out of cash. It defines the time to reach the next milestone or close the next funding round.
What Is Runway?
Runway is the amount of time — measured in months — that a startup can continue operating before exhausting its cash, assuming current revenue and spending remain constant.
Runway = Cash Balance ÷ Net Monthly Burn Rate
If you have $600,000 in the bank and burn $50,000/month net, your runway is 12 months.
Why Runway Is Critical
Runway is the clock ticking in the background of every startup decision. It determines:
- When to raise — you generally want to start fundraising 6 months before you run out
- How aggressively to hire — more runway = more room to experiment
- Whether to pivot — short runway forces hard choices faster
- Your negotiating position — founders with 18+ months of runway negotiate better terms
The Fundraising Timeline Rule
Start raising your next round when you have 6 months of runway left — not 3.
Fundraising takes longer than most founders expect: 3–6 months is typical from first pitch to wire transfer. Running close to zero cash is dangerous and creates panic-driven decisions.
Optimal Runway Targets
| Round | Target Runway After Closing |
|---|---|
| Pre-seed | 12–18 months |
| Seed | 18–24 months |
| Series A | 18–24 months |
| Series B+ | 24–36 months |
The general advice is to raise enough for 18–24 months, giving you time to hit milestones that unlock the next round at better terms.
Extending Your Runway
Without raising, you can extend runway by:
- Growing revenue — every dollar of new MRR reduces net burn
- Cutting costs — reduce headcount, renegotiate contracts, defer non-critical spend
- Raising a bridge round — a small injection from existing investors to reach a milestone
- Revenue-based financing — borrow against future revenue with no equity dilution
The Runway Trap
More runway is not always better. Too much cash can create complacency — the urgency that drives good startup decisions can fade. The best founders use runway as a forcing function: “By the time this expires, we must have X.”
Key Takeaway
Always know your runway to the day. Then work backwards: what must be true in 6 months? In 12? Use that to set your sprint goals and fundraising timeline.