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Startup Runway Calculator — Real Month-by-Month Cash Simulation

Enter cash on hand, burn rate and revenue growth rate for a real month-by-month cash simulation that accounts for compounding revenue growth, rather than a single static "cash ÷ burn" division that ignores growth entirely. It shows your actual runway, projected break-even month, and whether you are "default alive" or "default dead" under current trends. An AI pass then gives runway strategy advice.

How to use AI Startup Runway & Burn Calculator

  1. Enter current cash, monthly burn and revenue.
  2. Set your expected monthly revenue growth rate.
  3. Read the month-by-month simulation, runway and break-even point.
  4. Run the AI pass for runway strategy.

Frequently asked questions

What does "default alive" mean?
A term from startup finance meaning that at current growth and spending trends, the company reaches profitability before running out of cash without needing to raise again — "default dead" is the opposite.
Why simulate month by month instead of cash ÷ burn?
A static division assumes burn never changes, which understates runway for a growing, revenue-generating company and overstates it for one with worsening burn — the simulation captures the trend instead of a single snapshot.
How sensitive is runway to the growth rate assumption?
Very — small changes in assumed monthly growth compound significantly over a 12-18 month runway, which is exactly why the simulation runs month by month rather than extrapolating linearly.

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