Product Pieces.
Free tool · for founders

How long does your money last?

Four numbers in, and you get your runway, the date you hit zero, and the date you should actually start raising. Then see what a raise or a cost cut buys you.

£
£
£
%
How fast monthly revenue is growing. Leave blank if flat.
Scenarios · what if you…
£
£
Your runway
0
Cash hits zero
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Start raising by
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Enter your numbers
Rules of thumb: investors like to see 18 to 24 months of runway after a round. Under 6 months is the danger zone. And start raising about 6 months before zero, because a round takes 3 to 6 months to close, not the fortnight founders hope for.

Want a fuller cash plan and a second opinion?

Leave your details and we'll send you a deeper read on your runway, with specific thoughts on where to cut and when to raise. If it looks tight, or looks like it needs a hand, someone from Product Pieces may follow up. No spam.

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About this tool

What the Runway Calculator does.

Put in the cash, the costs, any revenue and how fast it is growing, and it returns three things: your runway in months, the date the account reaches zero, and the date you have to start raising to avoid negotiating from a weak position. That third number is the one founders do not have and the one that decides everything.

Who it is for. Any founder whose runway lives in a spreadsheet tab nobody has opened this month, and anyone deciding whether to hire, to build, or to raise.

What it will not do. It is not a financial model or a forecast, and it assumes your cost base behaves roughly as you describe it. It answers one question honestly rather than thirty vaguely.

Why is the date I start raising different from my zero date?
Because a raise takes months, not weeks, and an investor can tell when you are running out. Working backwards from zero is what stops the round happening on somebody else's terms.
Should revenue count towards runway?
Only revenue that has actually arrived, or that is contracted and reliable. Pipeline is not cash, and a forecast in a runway calculation is how a nine-month runway turns out to be five.
What is a healthy runway?
Long enough to reach the next piece of evidence and then raise on it, which for most pre-seed companies means eighteen months rather than twelve. Runway is not a number to maximise; it is time bought to prove something specific.
Product Pieces · Senior product, by the piece. productpieces.io