Startup Runway Calculator
Calculate
Results are estimates based on the assumptions you enter. Review the notes on this page before using a result for an actual financial decision.
Results
What this startup runway calculator is actually doing
People look up a startup runway calculator when a spreadsheet feels like overkill and a lender or app will not show its work. On the default case (cash on hand of $250,000.00, monthly burn of $35,000.00, monthly burn increase of 0.00%, planning months (optional) of 12) the tool shows 7.1 months. Overwrite every sample field that is not your life.
A margin or runway figure is only useful if the inputs look like the operating accounts, not the pitch deck. A natural next step is the Startup Burn Rate Calculator.
U.S. Small Business Administration is the primary source if your decision is large enough to argue about.
Inputs on this startup runway calculator
Each label is a variable in the model. If a unit is already shown as $ or %, do not convert it again.
- Cash on Hand — dollars. Sample $250,000.00.
- Monthly Burn — dollars. Sample $35,000.00.
- Monthly Burn Increase — annual percent unless the label says otherwise. Sample 0.00%. Type 6 for 6%, not 0.06.
- Planning Months (optional) — a monthly figure. Sample 12.
Calculate refreshes the cards. Reset restores the sample. When you compare two offers, change only the field that actually differs.
Worked example
Using cash on hand of $250,000.00, monthly burn of $35,000.00, monthly burn increase of 0.00%, planning months (optional) of 12, the engine prints 7.1 months as “Startup Runway Calculator”.
- Cash: $250,000.00
- Monthly Burn: $35,000.00
- Runway: 7.1 months
If you retype those defaults and get a different headline, reload the page before you invent a more exotic explanation.
The formula
The model uses Runway (months) = cash ÷ monthly burn. That is a standard classroom or practitioner identity for this kind of business question. It does not pull live quotes and it does not score your credit.
Where this estimate goes wrong
Revenue growth is not cash in the bank. If the tool asks for burn or margin, give the operating figure.
Related CalculatorWeb tools
Keep going with the Startup Break Even Calculator if you still need a sibling number. The Startup Burn Rate Calculator is built for the next assumption people usually forget. All of these pages keep the shortcode math in the open, so you can reuse the same dollars.
- Startup Break Even Calculator
- Startup Burn Rate Calculator
- Startup Cash Flow Calculator
- Startup Cost Calculator
Official references
Read U.S. Small Business Administration for the official definition, not a resale of it. Also useful: SBA business guide and SBA startup costs. These are editorial citations, not ads or affiliate placements.
Questions people ask about this startup runway calculator
What does this startup runway calculator calculate?
It applies Runway (months) = cash ÷ monthly burn to the fields on this page. The large number is the headline; the four cards split it so you can check the pieces.
Can I add extra principal?
If there is an extra-payment field, yes. Otherwise lower the balance or shorten the term and rerun.
Is the Startup Runway calculator free?
Yes. There is no signup wall on the tool. Use it whenever the question changes.
Can I treat 7.1 months as advice?
No. It is an educational estimate from the sample or from numbers you typed. A licensed professional and the official form still sit above it.
Limits
Last formula review: 18 August 2026. Same inputs produce the same outputs. This page does not replace a disclosure, a Form 1040, a Closing Disclosure, or advice from someone who can accept a fiduciary duty. If the business decision is large, print the inputs you used and take that sheet with you.