Burn Rate & Runway Calculator
How long until you run out of cash? Enter your bank balance, revenue and expenses to get your net burn and runway.
Financial modeling and cash-tracking tools
Learn moreGross burn vs net burn
Gross burn is everything you spend each month; net burn subtracts revenue and is what actually drains the bank. Runway — cash divided by net burn — tells you how many months you have. Founders raise when runway is healthy, not when it’s nearly gone.
How it’s calculated & sources
Net burn = expenses − revenue. Runway = cash ÷ net burn (in months). If revenue covers expenses, you’re cash-flow positive and runway is effectively unlimited.
Benchmark: investors generally want 18+ months of runway after a raise; dropping below 6 months is a red flag.
Results update as you type and are general estimates, not personalized financial, tax, medical or legal advice. Verify with a professional.
Worked example
With $500,000 in the bank, $40k revenue and $90k expenses, net burn is $50k/month — about 10 months of runway. Time to plan the next raise.
Frequently asked questions
When should I start fundraising?
Raising takes months, so begin while you still have 6–9 months of runway. Negotiating from strength beats raising on fumes.
How do I extend runway?
Grow revenue, cut non-essential spend, or raise capital. Even small expense cuts move the runway meaningfully when burn is high.