Runway Calculator
Months of runway left based on current cash and burn rate.
Runway = Cash ÷ Monthly burn. It tells you how many months you can operate at current spend before running out of money. Gross burn is total monthly expenses; net burn subtracts revenue. Aim for at least 6–12 months of runway. This calculator lets you model different burn scenarios and see how cost cuts or revenue changes extend runway.
Inputs
Results
Gross burn: $12,000/mo
Net burn: $4,000/mo
Runway (net): 12.5 months
Expenses vs Revenue
Insights
Formula
Gross burn = Monthly expenses Net burn = Expenses - Revenue Runway = Cash / Net burn (or Cash / Gross burn if no revenue)
Input Definitions
What does each input mean?
- Current cash
- Cash in bank available to operate. Runway = cash ÷ net burn.
- Monthly expenses
- Total monthly burn (gross burn). All operating costs.
- Monthly revenue
- Income that offsets burn. Net burn = expenses − revenue.
Related Calculators
How Long Can Your Business Operate Before It Needs More Capital?
Runway is the number of months a business can continue operating at its current burn rate before running out of cash. It’s one of the most consequential numbers in any early-stage company because it determines when you need to raise, what leverage you have in fundraising, and how much time you have to fix underperformance. This calculator helps you compute it from your current cash position and monthly net burn.
Use it when you’re preparing for investor conversations and want to show you understand your financial position clearly, when you’re deciding how aggressively to spend on growth versus preserving capital, or when something unexpected changes your expense base and you want to know the impact immediately. Knowing your runway to the month is a credibility marker in any funding conversation.