Runway & Burn Calculator
Divide cash by monthly net burn to see how many months of runway you have.
How long the cash lasts
Runway is the number every startup watches: how many months it can keep operating before the money runs out. It comes from dividing cash on hand by the net monthly burn — expenses minus revenue.
With 300k in the bank, 60k of monthly expenses, and 20k of revenue, net burn is 40k and runway is 7.5 months. Growing revenue or trimming expenses stretches it; this is the math behind fundraising timing.
Practical and private
It computes net burn and runway in your browser, so these sensitive figures never leave your device.
Frequently Asked Questions
What is runway?
How long your cash lasts at the current burn rate — cash on hand divided by net monthly burn, in months.
What is net burn?
Monthly expenses minus monthly revenue. If you spend 50k and make 20k, your net burn is 30k a month.
Why track it?
It tells a startup how long it has before needing more revenue or funding, which drives hiring, spending, and fundraising timing.
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