Startup Runway Calculator

Runway is how long your company can keep operating before it runs out of cash, measured in months. It answers the question every founder and investor cares about: at the current pace, when does the bank balance hit zero. A longer runway gives you more time to grow revenue, cut costs, or raise your next round.

Runway equals your current cash divided by your net monthly burn. Net monthly burn is your gross burn (total monthly spend) minus your monthly revenue. For example, with 600,000 dollars in the bank and a net burn of 60,000 dollars per month, your runway is 600,000 divided by 60,000, which is 10 months.

Gross burn is everything you spend in a month, including salaries, rent, software, and marketing. Net burn is gross burn minus the revenue you collect that month, so it reflects the cash you actually lose. Runway is always based on net burn, because incoming revenue extends how long your cash lasts.

When monthly revenue equals or exceeds gross burn, your net burn is zero or negative, so you are at break-even or cash-flow positive and are not depleting cash. In that case the calculator shows your runway as unlimited rather than dividing by zero. Keep in mind that one strong month does not guarantee the trend will hold.

It starts from today and advances by your runway in months, then adds the leftover fraction as days within the following calendar month. It respects real month lengths and leap years, so a runway that ends in a short month lands on a valid date rather than an approximate 30-day block.

No. This calculator gives a quick estimate based on a single, steady net burn and does not account for seasonality, one-time costs, hiring plans, or changes in revenue. Treat the result as a planning starting point, not financial, tax, or investment advice, and confirm the figures with your own model or an advisor.