Free startup calculators
for founders who watch the runway
Quick, no-signup calculators for the numbers that decide whether your startup survives. Run the math in seconds — then save and track it automatically inside BurnRateOS.
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Instant results
Always free
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Free calculators
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The three numbers every founder should know
Each tool runs entirely in your browser — no data leaves your device. Save your results to BurnRateOS to track them over time.
Burn Rate Calculator
Add your monthly expenses and revenue to see your gross and net burn instantly. Know exactly how fast your startup is spending cash each month.
Runway Calculator
Enter your cash on hand and monthly net burn to calculate how many months of runway you have left — plus your estimated zero-cash date.
Churn & LTV Calculator
Measure monthly churn, retention, and revenue lost — and get a quick lifetime-value estimate from your ARPU and churn rate.
Break-Even Calculator
Enter your fixed costs, price, and variable cost per unit to find exactly how many units you must sell to break even — and the revenue that takes.
Track these numbers automatically
Stop recalculating in a spreadsheet. BurnRateOS keeps your burn, runway, and churn updated in real time as your expenses, cash, and customers change.
Free runway tracking • No credit card required