Free tool
Startup runway calculator.
How many months of cash you have left, when the account reaches zero, and whether revenue catches costs before it does. Runs entirely in your browser. Nothing is stored.
Runway
8months
Revenue never catches costs at these growth rates.
- Net burn, month one
- US$34,000
- Breakeven
- Not reached
- 18 month test
- Short by 10
Most rounds take 6 to 9 months to close. Under 18 months means raising now.
Month by month
Where the cash actually goes. Growth compounds from month two, so the first row is what you typed in.
| Month | Revenue | Costs | Net | Cash left |
|---|---|---|---|---|
| 1 | US$8,000 | US$42,000 | -US$34,000 | US$216,000 |
| 3 | US$10,035 | US$44,558 | -US$34,523 | US$147,177 |
| 6 | US$14,099 | US$48,690 | -US$34,591 | US$43,248 |
| 8 | US$17,685 | US$51,655 | -US$33,969 | US$0 |
Everything here is worked out in your browser. Nothing you type is sent to us or stored anywhere.
Four things people get wrong
Runway is not cash divided by burn
That formula assumes next month looks like this month. It never does. Costs creep up as you hire and as usage bills grow, and revenue moves at its own rate. This calculator compounds both, which is why the number it gives is usually shorter than the one in your head.
Count everything in costs
The most common mistake is a costs figure that quietly excludes taxes, contractors, annual tools billed once a year, and the founders' own salaries. If the number you typed is smaller than what actually leaves the account, every figure on this page is optimistic.
Eighteen months is the number that matters
Raising takes most teams six to nine months from first conversation to money in the bank, and you cannot raise well from a position of three months left. If your runway is under eighteen months, the honest read is that you are already raising, whether or not you have started.
Growth rate is the assumption doing all the work
Change the monthly revenue growth by a few points and the whole picture moves. If you cannot point at three months of history that support the rate you typed, treat the result as the optimistic case and run it again at half the growth.
Short runway usually means the build has to be smaller.
Working out the smallest version that proves the business is most of what we do with founders. Thirty minutes, no pitch.