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Free Startup Finance Tool
Burn Rate & Runway Calculator
Work out your startup's burn rate, cash runway, and projected cash-out date in seconds — then see how to extend it. Free, private, no sign-up.
Instant results
100% private
PDF report
Your numbers
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Runway
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Net burn / month
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Gross burn / month
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Est. cash-out
Cash balance projection
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What is burn rate?
Your burn rate is how fast your company spends cash, usually measured per month. It's the single most important number for any pre-profit startup, because it determines how long you can operate before you run out of money — your runway.
Gross burn vs. net burn
- Gross burn = your total monthly operating expenses (salaries, rent, software, marketing — everything going out). It's what you'd burn with zero revenue.
- Net burn = monthly expenses minus monthly revenue. It's your real cash loss each month. If revenue exceeds expenses, your net burn is zero — you're cash-flow positive.
How to calculate burn rate and runway
The formulas this calculator uses:
- Net burn = Monthly expenses − Monthly revenue
- Runway (months) = Current cash balance ÷ Net burn
- Cash-out date = Today + Runway
When you add expected revenue or expense growth, the tool projects your cash month-by-month instead of assuming a flat burn — so the runway reflects how your spend and income actually change over time.
How to extend your runway
- Cut non-essential spend. Even a 10–15% expense reduction can add months of runway.
- Grow revenue. Every dollar of revenue directly reduces net burn.
- Automate repetitive work instead of hiring for it — one of the fastest ways to lower burn without slowing down.
- Raise before you're desperate. Most investors want to see 12–18 months of runway after a round.
Frequently asked questions
What is a healthy runway?
Most startups aim for 12–18 months of runway, especially right after raising. Under 6 months is a warning sign that you should be cutting costs or fundraising now.
Should I use gross or net burn for runway?
Use net burn — it accounts for the revenue offsetting your costs. Gross burn matters for worst-case planning (what happens if revenue disappears).
Is this calculator free and private?
Yes. It's completely free with no sign-up, and all calculations run in your browser — your financial numbers never leave your device unless you choose to email yourself the report.
Is this financial advice?
No. It's an estimation tool to help you plan. For decisions, confirm the numbers with your finance team or advisor.
