Cash Runway Calculator
Find out how long your cash will last. Enter your cash on hand and monthly net burn to get your runway in months and the date you would run out.
What runway means
Runway is the number of months your business can keep operating before the cash runs out, assuming nothing changes. You find it by dividing your cash on hand by your monthly net burn, which is what you spend minus what you bring in. Founders track runway closely because it sets the deadline for reaching profit or raising more money.
Burn rate is the lever
Two businesses with the same cash can have very different runways. The one that spends less each month lasts longer. If your runway looks short, you have two moves: increase income or reduce burn. Even a small cut to monthly spend can add weeks. This tool shows the out-of-cash date so the deadline feels real, not abstract.
How to use it
Enter your current cash and your monthly net burn. The tool returns your runway in months and weeks, plus the month you would run out. If your burn is zero or you are profitable, your runway is effectively unlimited. To model how cutting costs changes things, adjust the burn and watch the date move. For the loan side of funding, see the Loan Calculator.
Frequently Asked Questions
How do you calculate cash runway?
Divide your cash on hand by your monthly net burn rate. The result is the number of months before you run out.
What is net burn?
Net burn is your total monthly spending minus your monthly income. It is the real rate your cash balance falls.
How much runway should I keep?
Many advisors suggest at least six months. Under three months is a warning sign that needs action.
Is the tool free?
Yes, free and runs in your browser.