Runway & Burn Rate Calculator

Gross burn is what leaves the bank each month; net burn is that less the cash that comes in. Runway is the cash balance divided by net burn — the number of months until the balance reaches zero if nothing changes — and, given a start date, the calendar date that lands on. Investors usually ask for net burn and runway; gross burn is the figure to cut if revenue disappears.

Enter a monthly growth rate for revenue and, if costs will rise too, for expenses, and the page walks forward month by month, compounding each and adding a funding amount in the month you choose. It reports when cash runs out (as a fraction of a month), the first month revenue covers expenses, and the lowest cash balance reached — the trough a raise has to cover. No growth rate is suggested; a rate that is not sustained makes the simulated runway optimistic, and the page says so.

Everything here is cash: revenue counts when received, expenses when paid. Annual prepayments, receivables, deferred revenue, one-off costs and taxes due are not modelled and can move the real zero-cash date by months in either direction — add them to the monthly figures or the funding event if they matter. Nothing leaves the browser; the same four anonymous usage counts as the rest of the site apply.