🚀 Startup Runway Calculator
Know exactly how long your cash will last. Enter your balance, monthly expenses, and revenue to calculate gross/net burn, runway end date, and how much funding you need to extend.
Funding Needed to Extend Runway
| Extension | Total Runway | Additional Funding Needed |
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Runway Formulas
Frequently Asked Questions
Runway is the number of months a startup can operate before running out of cash, calculated as Cash Balance ÷ Net Monthly Burn Rate. It represents the time available to reach profitability or raise additional funding.
Conventional wisdom suggests 18-24 months of runway. Fundraising takes 6-12 months, so you need to start raising when you have 12+ months left. Having less than 6 months is a critical danger zone.
Gross burn is total monthly cash outflow (all expenses). Net burn subtracts revenue: Net Burn = Expenses − Revenue. Net burn is what determines runway since it is the actual cash depletion rate.
Break-even means monthly revenue equals monthly expenses (net burn = $0) — you stop consuming cash but haven't necessarily made a profit on total capital invested. Profitability means generating positive returns on all invested capital.
Cut non-essential expenses, renegotiate vendor contracts, reduce headcount, move to remote work, delay capital purchases, focus sales on higher-margin products, and optimize infrastructure costs. A 20% burn reduction extends runway by 25%.
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