Startup Runway Calculator
Net burn, runway in months, cash-out date and the latest date to start raising, plus five scenarios.
Your runway and raise date will appear here
The form starts with editable example values. Calculate runway as-is, or replace them with your own cash and burn first.
Runway is not just months of cash. It is your raise clock.
Most runway calculators stop at a number. This one turns runway into the latest responsible date to start fundraising.
Net burn, not gross
Investors care about how fast you consume cash after revenue. The calculator shows both.
Runway vs round length
You need enough runway to close and still have buffer. Raising late weakens terms.
The trajectory
Flat burn with growing revenue is a story. Rising burn with flat revenue is a warning.
The math behind your runway
Simple, transparent, and the same numbers an investor will run in their head.
The default fundraising buffer is about five months, roughly the time from first outreach to wired funds for a founder-led round.
Everything recomputes locally in the browser, including the scenario table.
Runway mistakes that cost founders
Starting the raise too late
By the time pressure feels obvious, you have often lost the leverage of raising early.
Ignoring the cash floor
You cannot spend to zero. Payroll, legal, and a soft landing all need a buffer.
Assuming revenue lands on plan
The revenue miss scenario is not pessimism. It is prudence.
Related free tools
Questions founders ask
What is a healthy amount of runway?
Many founders aim to keep 12+ months. Below that, you should prepare to raise; below 6 months you are often raising from a weaker position.
Does it work if I have no revenue?
Yes. With zero revenue, net burn equals gross burn. If revenue exceeds expenses, the calculator marks you default alive.
Is my financial data private?
Yes. The calculation runs in the browser. This public tool does not send your numbers to RoundOS.