Runway is just cash ÷ burn.
Burn is how much more cash leaves than comes in each month. Runway is how many months that lasts before the bank account hits zero — your cash divided by your monthly burn. If more comes in than goes out, you're not burning at all; your runway is effectively unlimited and you're building a buffer instead.
The trap is that runway feels abstract until it's short. Knowing it precisely — and which lever (cutting cost vs. growing revenue) buys the most time — is the difference between a calm decision now and a forced one later. Enter your numbers below.
- Cash on hand
- Money actually available now — bank balance plus anything you can draw on immediately.
- Cash in / month
- Real money landing in the account monthly (collections), not invoiced revenue you haven't been paid for.
- Cash out / month
- Everything leaving monthly — payroll, rent, software, suppliers, your own draw.
- Net burn
- Cash out minus cash in. If it's positive you're burning; if negative you're cash-flow positive.
Cash you have right now
Your monthly cash flow
Is revenue growing?
Runway tells you how long. The plan is what you do with it.
Whether the number scared you or relieved you, the next move is the same: a cash plan that buys the most time per dollar — the right cuts, the collections fix, and the financing to bridge the gap before you need it, not after. I do this with founders every week, and the first conversation is free.
Build my cash plan →How the math works (for the curious)
The headline is the simple, conservative version finance uses for planning: Runway (months) = Cash on hand ÷ Net monthly burn, where Net burn = Cash out − Cash in. If net burn is zero or negative, you're not burning — runway is effectively unlimited at today's numbers.
The growth scenario is a month-by-month simulation: each month we subtract that month's burn from cash and grow cash-in by your growth rate, stopping when cash hits zero (or marking it unlimited if rising revenue overtakes spend first). The "what moves it" rows recompute runway after a 15% cost cut, a 25% lift in collections, and a one-time cash raise equal to two months of spend — so you can see which lever buys the most time for your specific numbers.
The zero-cash date is today plus your runway. It's a planning estimate, not a forecast of your actual bank statement — real months vary.
An estimate for planning — not accounting, tax, or financial advice. Uses the numbers you enter; pull them from your bank and bookkeeping for the best read. Nothing leaves your browser. Logic current as of June 2026.