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Find out how fast you're spending cash — and how many months you have left before you run out.
Burn Rate Calculator
Gross burn = total monthly spend, regardless of revenue. Net burn = spend minus revenue — the actual rate your cash balance is shrinking.
Gross burn rate (monthly)—
Net burn rate (monthly)—
Runway (months)—
Estimated zero-cash date—
The Formulas
Gross burn = Monthly expenses
Net burn = Monthly expenses − Monthly revenue
Runway = Cash in bank ÷ Net burn
If net burn is zero or negative (you're cash-flow positive), runway is effectively infinite — you're not burning cash at all.
Runway Benchmarks
Under 6 months
Critical — fundraise or cut costs now
6–12 months
Tight — start fundraising process
12–18 months
Healthy — typical fundraise trigger zone
18+ months
Comfortable runway
Simplified model. Assumes constant monthly expenses and revenue. Doesn't account for seasonal variation, one-time costs, or revenue growth — useful as a snapshot, not a full financial model.