Free tools
Founder Calculators
Real calculators, not articles pretending to be tools. Each one runs entirely in your browser, states its formula, and refuses to invent a number you didn't give it. Free, no sign-up, nothing stored.
Startup Runway Calculator
How many months of cash do I have left?
Net burn, runway in months, what 10% and 20% burn cuts buy you, and the burn required to hit a runway target.
Open calculatorBurn Rate Calculator
What am I actually burning each month?
Gross and net burn derived from two bank balances, with cash raised excluded so the number reflects operations.
Open calculatorBreak-Even Calculator
How much do I need to sell to stop losing money?
Contribution margin, break-even units and revenue, volume for a target profit, and margin of safety.
Open calculatorLearn the method
Each calculator has a companion guide that explains what the number means and where founders get it wrong. Start with How to Calculate Startup Runway, or browse all founder guides.