Know exactly how many months of cash you have left — and when you run out.
Net burn = expenses − revenue. Runway assumes today's burn rate holds steady.
Out of cash around —
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Cash runway is how many months your business can keep operating before it runs out of money at its current spending. It's calculated from your cash balance and your net burn — monthly expenses minus monthly revenue. Gross burn is your total monthly spend; net burn accounts for the revenue offsetting it.
Investors also watch the burn multiple — net burn divided by net new revenue — as a measure of capital efficiency. This calculator gives you runway in months, your projected zero-cash date, and your burn multiple so you can plan a raise or cut costs in time.
Enter cash in bank, monthly expenses and revenue.
See your net burn and runway instantly.
Add new monthly revenue for your burn multiple.
Plan your raise before the runway gets tight.
Runway = cash balance ÷ net monthly burn. It's the number of months you can operate before cash runs out at the current rate.
Gross burn is total monthly cash spent; net burn is gross burn minus monthly revenue. Runway is based on net burn.
Burn multiple = net burn ÷ net new revenue. Lower is better — under 1× is excellent and above 2× signals inefficient growth.
Most founders aim for 12–18 months after a raise, and start fundraising again well before runway drops below about 6 months.