Startup Runway & Burn Rate Calculator
Calculate your monthly burn rate and how many months of runway your cash on hand provides.
Published by Blueprint Dynamics. Planning tools, not professional advice. Read the formula, assumptions, and examples below before relying on a result. Independent professional review is not claimed. Learn more about our methodology →
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Scope and reference context
Planning assumptions are not market evidence. Validate customer counts, costs and demand with actual interviews or records; a weighted score does not predict success.
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About the Startup Runway & Burn Rate Calculator
For a startup, cash is oxygen, and runway is how long you can keep breathing at your current rate of spending. This calculator answers the single most important survival question — how many months until the money runs out — by comparing your cash on hand against your net monthly burn. Knowing that number is what lets you decide when to raise, when to cut, and how much risk you can afford.
Crucially, the tool works from net burn rather than gross spending. A company spending heavily but also earning revenue burns far less than its expense line suggests. By netting revenue against expenses first, the calculator shows the true rate at which your bank balance is shrinking and, if you have crossed into profitability, tells you plainly that you are no longer burning at all.
How the Startup Runway & Burn Rate Calculator works
You enter three figures: Cash on Hand, Monthly Revenue, and Monthly Expenses. The tool first computes Net Burn as Expenses minus Revenue. If that result is zero or negative, you are profitable and the runway is effectively unlimited, which the tool reports rather than dividing by a negative number.
When net burn is positive, runway in months equals Cash on Hand divided by Net Burn. The calculator also projects an approximate cash-out date by adding the whole number of runway months to today. This assumes revenue and expenses hold steady, so it is a snapshot of your current trajectory rather than a forecast of a changing business.
Worked example
Suppose you have $250,000 in the bank, generate $15,000 in monthly revenue, and spend $55,000 a month. Net Burn is $55,000 minus $15,000, or $40,000 a month — the real rate your cash is depleting once revenue is accounted for.
Runway is $250,000 divided by $40,000, which the tool shows as about 6.3 months, and it projects the approximate month your cash would run out roughly six months from today. That single figure reframes every decision: a new hire that pushes expenses to $65,000 would cut net burn runway to about five months, so you can immediately see the survival cost of any spending change.
Tips & common mistakes
- Track net burn, not gross spending. Revenue meaningfully extends runway, and ignoring it makes your situation look worse — and your decisions more panicked — than reality warrants.
- Start raising capital well before runway runs low. Fundraising typically takes months, so begin when you still have six or more months left, not when you are nearly out.
- Model changes before you make them. Re-run the calculator with a prospective hire or marketing spend to see exactly how many months it costs you.
- Remember the projection assumes steady numbers. If revenue is growing or a big expense is coming, treat the runway as a moving target and refresh it often.
- Aim to reach a fundable milestone within your runway, not merely to survive it. Runway that ends without progress just delays the same crisis.
Startup Runway & Burn Rate Calculator: frequently asked questions
How is net burn different from monthly expenses?
Net burn is Monthly Expenses minus Monthly Revenue — the actual rate your cash balance falls each month after accounting for income. If you spend $55,000 but earn $15,000, your net burn is $40,000, not $55,000. Using net burn gives a far more accurate runway than looking at expenses alone.
What happens to the runway if I am profitable?
If your revenue meets or exceeds your expenses, net burn is zero or negative, so the tool reports that you are profitable rather than showing a runway figure. In that case your cash is growing, not shrinking, and the countdown to running out no longer applies.
How is the cash-out date calculated?
The tool takes the whole number of runway months and adds them to today's date to estimate roughly when your cash would be exhausted at the current burn rate. It is an approximation that assumes your revenue and expenses stay constant, so treat it as a directional guide rather than a precise deadline.
How much runway should I keep at all times?
A common rule of thumb is to keep enough runway to reach your next major milestone plus a buffer for fundraising, since raising money usually takes several months. Many founders get nervous below six months and treat that as the trigger to either raise capital or cut burn.
Does the calculation account for revenue growth over time?
No. It assumes your current monthly revenue and expenses hold steady, giving you a snapshot of today's trajectory. If your revenue is climbing, your real runway is longer than shown, so re-run the numbers regularly as your revenue and cost structure change.