Cash Runway Calculator
How long does your cash last? Enter your cash on hand, monthly revenue and monthly expenses, and this tool returns your net burn, your months of runway, a projected zero-cash date, and the revenue level you need to reach to break even before the cash runs out. Nothing you enter is stored.
Last updated August 30, 2026
How it works
Net burn is monthly expenses minus monthly revenue. Divide cash on hand by net burn and you get the number of months before the account reaches zero at today's rate. If you enter a monthly growth rate for revenue, the tool also estimates when growing revenue would meet expenses, and whether that happens before or after the cash runs out. The revenue you need to break even is simply your monthly expenses.
A worked example
A business holds $500,000 in cash, brings in $80,000 a month and spends $120,000. Net burn is $40,000 a month, so runway is 12.5 months. Break-even needs revenue to reach $120,000. If revenue grows 5 percent a month, it would reach $120,000 in about 8 months, comfortably inside the 12.5 months of runway. Change growth to zero and the business simply runs out in 12.5 months.
Why runway is the number that concentrates the mind
Profit is an opinion; cash is a fact. A business can look healthy and still fail because it ran out of money before it turned the corner. Runway tells you how much time you are actually buying, and the growth view tells you whether the plan closes the gap in time. When runway gets short, the two levers are the obvious ones: raise revenue or cut expenses, and the calculator shows how each moves the date.
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Frequently asked questions
What is net burn?
Monthly operating expenses minus monthly revenue. If expenses exceed revenue, that difference is the cash you consume each month. If revenue exceeds expenses, you are cash-flow positive and have no runway limit at current levels.
How is the zero-cash date calculated?
By dividing your cash on hand by your net burn to get the number of months, then counting forward from today. It assumes the burn rate holds steady, so treat it as a marker, not a promise.
What does the growth rate change?
If you enter a monthly revenue growth rate, the tool estimates when revenue would rise to meet expenses, and flags whether that arrives before or after the cash runs out.
Is my data stored?
No. The calculation runs entirely in your browser. Nothing you enter is saved or sent anywhere.