How long your cash lasts at the current burn, and the month it runs out.
Net monthly burn--
Cash runs out--
Cash on hand--
Runway is cash on hand divided by net monthly burn, where net burn is expenses minus revenue. If revenue meets or beats expenses, there is no runway limit at today's numbers. This assumes burn and revenue hold steady, which they rarely do, so treat it as a planning figure.
NOT FINANCIAL ADVICE. A PLANNING CALCULATOR, NOT A RECOMMENDATION.