Runway Calculator
See exactly how many months of runway you have left, and the latest date to start fundraising.
Net burn
$50,000/mo
Runway
10.0 months
Cash runs out
August 2027
Start fundraising by
February 2027
Six months before your runway ends. Raising typically takes longer than founders expect it to.
Net burn = monthly expenses minus monthly revenue. Runway = cash in bank ÷ net burn. This uses today's numbers; update it as revenue and costs change.
Educational estimate, not legal or financial advice.
How it works
Check your runway in 3 steps
Enter the cash you have in the bank today.
Enter your monthly revenue and monthly expenses.
See your net burn, your runway, the month your cash runs out and when to start fundraising.
Worked example
$500K in the bank, $50K net burn
Inputs
- Cash
- $500,000
- Monthly revenue
- $20,000
- Monthly expenses
- $70,000
Result
- Net burn
- $50,000/mo
- Runway
- 10 months
- Start raising in
- about 4 months
Start fundraising 6 months before the cash runs out.
How we got there
You have $500,000 in the bank, $20,000 in monthly revenue and $70,000 in monthly expenses. Your net burn is $50,000 a month, so you have 10 months of runway. You should start fundraising 6 months before the cash runs out, which is about 4 months from now.
Reading your result
How much runway is enough?
Good sign
12 to 18 months of runway.
Red flag
Under 6 months: start raising or cutting costs now.
Runway is negotiating power. With less than 6 months left, investors can sense the urgency and you lose leverage on valuation and terms.
Run this every month. Growing revenue extends your runway, and every new hire shortens it.
FAQ
Runway questions founders ask
Divide the cash in the bank by your net monthly burn (monthly expenses minus monthly revenue).
12 to 18 months is comfortable. Under 6 months means you should act now.
At least 6 months before your cash runs out, because a round usually takes 3 to 6 months to close.
Gross burn is everything you spend each month. Net burn is what you spend minus the revenue that comes in.
Cut non-essential costs, grow revenue, ask customers to prepay annually, or raise a small bridge from existing investors.