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Runway Calculator
Calculate how many months your startup can survive at your current burn rate — and the exact month you'd run out of cash. Free runway calculator.
Benchmark fit
Is your result healthy for your specific business model, not just positive?
Sensitivity
Which single input, if wrong, would change the result most?
Time horizon
Does this hold up over 12 months, or only at today's volume?
Next decision
What should change in the business because of this number?
Runway is the single most important number for a pre-profitability startup, and the one most founders check too infrequently. It should be a monthly ritual, not a once-a-quarter surprise.
This calculator gives you months of runway and the specific calendar month you'd hit zero cash — so you know exactly when you need to have raised, cut costs, or reached profitability.
Free calculator
Runway calculator
See how many months your startup can survive at current burn — and the month you'd hit zero cash.
£
£/mo
£/mo
Results
Net monthly burn£6.0k
Runway10 months
Zero-cash month2027-08
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Why the exact zero-cash date matters
'6 months of runway' feels abstract. 'You run out of cash in June 2027' is a deadline. Founders who track the actual calendar date make sharper decisions about when to start fundraising (typically 6+ months before zero cash) and when to cut burn.
The runway trap
Runway calculated from a single month's burn rate is fragile — burn tends to increase as you hire, and revenue growth is rarely linear. Recalculate monthly, not once at the start, and build in a buffer for burn creeping upward.
How this calculator works
- Enter your current cash on hand.
- Enter your monthly costs (payroll, tools, rent, ads).
- Enter your current monthly revenue.
- The calculator shows net burn, months of runway, and the calendar month you'd hit zero cash.
Direct answer — Runway Calculator
Calculate how many months your startup can survive at your current burn rate — and the exact month you'd run out of cash. Free runway calculator.
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Frequently asked questions
How often should I recalculate my runway?
Monthly, minimum. Burn rate changes as you hire or cut costs, and revenue rarely grows in a straight line — a runway number from three months ago can be dangerously stale.
When should I start fundraising relative to my runway?
Most experienced founders start the fundraising process with 6–9 months of runway remaining, since raises commonly take 3–6 months from first conversation to funds in the bank.
What if my monthly revenue exceeds my costs?
You're profitable — there's no runway limit in the traditional sense, since you're not burning down cash. The calculator will show this explicitly rather than a misleading runway figure.
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