RUNWAY
CALCULATOR
Months remaining at current burn — with an optional growth rate adjustment.
At this burn rate, with the growth rate applied, you have 15 months before you need to raise or become profitable.
What this calculator does
Runway is the number of months a company can operate before it runs out of cash, assuming no new revenue or fundraising. This calculator gives you current runway, projected runway under different burn scenarios, and the latest date to close your next round to avoid a cash-out event.
Who uses it
Founders timing their fundraise. Investors assessing urgency and negotiating leverage. Board members monitoring financial health between rounds.
What to do with the output
Standard advice: begin your next raise when you have 9–12 months of runway remaining. Less than 6 months and you are raising from a position of weakness. Use this number to set your fundraising start date, not your wire date.
Key terms
Runway: months of cash at current burn. Cash-out date: the calendar date cash reaches zero. Fundraising buffer: the months required to close a round (seed: 3–6 months; Series A: 4–8 months). Hard deadline: cash-out date minus fundraising buffer — the latest date to begin raising.
How to use this in a deal room
Runway is the first number an investor uses to assess urgency. In a Lengdon deal room, the runway figure you calculate here feeds into the deal brief — so your stated timeline to close is grounded in a real number, visible to all parties.
Related tools
Know your raise timeline. When you're ready to close, Lengdon handles the full closing sequence.
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