Enter your cash balance, monthly expenses, and monthly revenue to find your net burn rate and how many months of runway you have left.
Burn rate is how fast a company spends its cash reserves, and runway is how long that cash will last at the current pace. For any pre-profit startup, these two numbers determine how much time you have to reach profitability or raise your next round.
Gross burn is your total monthly operating expenses. Net burn subtracts revenue: Net Burn = Monthly Expenses − Monthly Revenue. If you spend $60,000 and bring in $20,000, your net burn is $40,000 a month. Net burn is the figure that actually depletes your bank account.
Runway (months) = Cash on Hand ÷ Net Burn. With $500,000 in the bank and a $40,000 net burn, you have 12.5 months of runway. If revenue ever exceeds expenses, net burn goes negative — you are cash-flow positive and runway is effectively unlimited at the current rate.
Tip: Fundraising takes time. A common rule of thumb is to start raising when you have 6–9 months of runway left, so you are negotiating from strength rather than desperation.
You lengthen runway two ways: cut the burn (reduce expenses) or grow revenue. Because runway is cash divided by net burn, even modest revenue gains can add months. Model a few scenarios — a hiring freeze, a price increase, a slower-growth plan — to see how each changes the date your cash runs out. The chart projects your balance forward at the current net burn.