Free startup tools
Free Startup Tools for Founders
Every startup calculator here answers one question a founder actually asks. How long does my cash last? How fast am I burning? What do I give up in the next round? Type your numbers, get the answer. No signup. Nothing is stored.
Runway
Runway Calculator
Cash, expenses, revenue. See how many months you have left — and whether you're default alive.
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Burn rate
Burn Rate Calculator
Gross burn, net burn, and burn multiple. Know exactly how fast you're spending money.
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Fundraising
Dilution Calculator
Model a funding round. See what you actually own after the money lands.
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Decisions
Founder Reflex Test
Ten rapid-fire founder decisions. Find out where your instincts break.
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Why these numbers matter
Runway is your clock.
Cash divided by net burn. It tells you how many months you have before the company dies or raises. Every other decision hangs off this number.
Burn rate is your speed.
How much cash leaves the bank each month. Investors read it as discipline. You should read it as time being spent.
Dilution is your price.
Every round trades ownership for time. Knowing the math before the term sheet is how you avoid regret after it.
Calculators show the number. The game shows the consequences.
Founder Runway is a browser-based startup simulation. Make founder decisions turn by turn and watch your cash, runway, and product-market fit respond.
Play Founder Runway →