📉 runway

A clean, dependency-free startup runway & break-even calculator. Put in your cash, burn, revenue, and growth rate — see how many months you have, when you turn default-alive, and how cash moves month by month.

▶️ Live demo: https://makbanjac.github.io/runway/

What it tells you

• Runway — months until cash hits zero at your current trajectory.
• Default alive vs default dead — whether your growth reaches break-even before the cash runs out (the Paul Graham test).
• Break-even month, lowest cash point, and a live chart of your cash balance over 5 years.

Everything updates as you type. One file, no framework, no backend, no tracking.

Run locally

git clone https://github.com/makbanjac/runway
cd runway
open index.html      # or: python3 -m http.server 8000

The model

Revenue grows at your monthly rate; each month adds revenue − burn to cash. "Default alive" means revenue overtakes burn before the balance goes negative. Simple on purpose — a fast gut-check, not a 40-tab spreadsheet.

License

MIT © Mak Banjac