Startup Runway
Calculator
Before you raise, hire, or cut spend — get a real cash projection with revenue growth & expense growth. No spreadsheets, no sign‑up.
“This gave us the clarity we needed before our Series A. The scenario sliders alone saved us hours of spreadsheet work.”— Founder, SaaS startup · $2M ARR
Before you raise, hire, or cut spend, you need one number: how many months of cash your startup has left. The runway calculator below projects your cash balance forward using your real revenue growth and expense growth — not just a flat snapshot — so you can see exactly when you'd hit zero and what changes would extend that date.
Startup Runway Calculator
Enter your cash, revenue, and expenses to calculate your startup's runway, net burn rate, and break-even month — with instant scenario planning.
Your Startup
Financial inputsAdvanced assumptions
All calculations run locally in your browser — nothing is sent to a server.
Fill in your numbers and calculate to see your runway.
Projected Cash Balance
36-month projection💰 Cash-out date
Calculate your runway to see your projected cash-out month.
📈 Break-even outlook
We'll show whether your growth reaches break-even before cash runs out.
What If You Change One Thing?
Drag to test a scenarioCut expenses by 10%
— moIncrease revenue by 20%
— moAdd $100k cash
— moHow Much Do You Need?
Target runwayBased on your current assumptions.
Built for Founders, by Founders
No fluff — just the numbers you actually need to make decisions.
Real Projections
Revenue and expense growth are compounded month by month — not a flat snapshot. See exactly when you'd hit zero.
Instant Scenario Planning
Drag sliders to cut expenses, grow revenue, or add cash — see how each change affects your runway in real time.
100% Private
All calculations run locally in your browser. No data is sent to a server, stored, or shared — ever.
Funding Gap Analysis
Enter your target runway and the calculator tells you exactly how much additional capital you'd need to raise.
Break-even Clarity
Know exactly when your revenue is projected to cover expenses — before your cash runs out.
Free & No Sign-up
No credit card, no registration, no strings attached. Just enter your numbers and get your runway instantly.
Perfect For Every Stage
Whether you're pre-revenue or scaling — this tool meets you where you are.
Pre-Revenue
Zero revenue? No problem. See how long your cash lasts and what changes extend your runway.
Early Traction
Revenue is coming in — track your net burn and know exactly when you'll break even.
Growing SaaS
Model your growth rates and see how different revenue scenarios impact your runway.
Recently Funded
You just raised — now plan your spend. Know exactly how far your new capital will go.
VC Analysts
Quickly stress-test portfolio companies' runway and burn assumptions.
Bootstrapped
Every dollar counts. See exactly when you need to hit profitability before cash runs out.
How to Use the Startup Runway Calculator
Five steps from raw numbers to a clear, shareable runway plan — no signup, no spreadsheet.
Enter your basics
Type in your current cash, monthly revenue, and monthly expenses — or tap a preset like "Early Traction" to start from realistic numbers.
Set your growth rates
Open "Advanced assumptions" to add your monthly revenue and expense growth, plus how many months ahead you want to project.
Read your gauge
Your runway, net burn, and break-even month update instantly — the color-coded gauge tells you at a glance if you're healthy or critical.
Test a scenario
Drag the sliders to see how cutting costs, growing revenue, or adding cash would each change your runway on their own.
InteractiveGet your target
Set your desired runway to see exactly how much extra capital you'd need, then copy a clean summary to share with your team.
ShareableHow It's Calculated
No black box — here's exactly what the calculator does with the numbers you enter.
Net Burn Rate
This is how much cash your startup loses each month once revenue is subtracted from spend. If revenue is higher than expenses, net burn is zero or negative — meaning you're cash-flow positive.
Growth-Adjusted Projection
Expₘ = Exp₀ × (1 + g_exp)^m
Instead of assuming flat revenue and expenses, the calculator compounds your monthly growth rates forward — month by month — so a startup growing revenue 5%/mo looks very different by month 24 than one that's flat.
Cash Balance Over Time
Each projected month, that month's net burn is subtracted from the running cash balance. This produces the cash curve shown in the chart, month by month, using your growth-adjusted figures — not the static ones you started with.
Runway (Months)
At its simplest, runway is just cash divided by burn. Because burn changes every month as revenue and expenses grow, the calculator finds the exact month your cash balance crosses zero and interpolates to a precise decimal figure — for example, 14.6 months rather than a rounded 15.
Break-Even Month
This is the first projected month where revenue growth catches up to expense growth — the point where net burn hits zero and your startup stops needing outside cash to stay afloat.
Additional Capital Needed
To hit your desired runway, the calculator finds the lowest point your cash balance would reach before your target month and reports the shortfall — the extra capital that would keep you above zero the whole way through.
Assumptions & Limits
This calculator is a planning tool, not a financial forecast. A few things to keep in mind:
- Constant growth rates — revenue and expense growth are applied as a fixed monthly percentage for the whole projection. Real growth is rarely this smooth.
- No one-time events — it doesn't account for lump-sum costs (equipment, legal fees) or one-time inflows (grants, bridge notes) unless you fold them into your starting cash or monthly figures.
- No taxes or seasonality — the model assumes even, month-over-month spend and revenue with no seasonal swings.
- Local calculation only — all math runs in your browser; nothing you enter is stored or sent to a server.
Sources & Further Reading
The definitions and benchmarks used in this calculator draw on established startup finance resources. Worth a read if you want to go deeper.
How to Calculate Burn Rate, Runway, and Growth Rate
YC's startup library walks through the core formulas founders are expected to know before fundraising, straight from a YC partner.
Burn Rate — How to Calculate It & Its Importance
Corporate Finance Institute breaks down the difference between gross and net burn rate and why investors track it closely.
Burn Rate: Formula + Calculator
A finance-training breakdown of gross vs. net burn rate and how each feeds into an implied cash runway figure.
How to Calculate Runway & Burn Rate
A founder-investor reporting platform's practical guide to tracking runway as part of regular investor updates.
Burn Rate — Background & Origin
Background on where the term "burn rate" came from and how it's used beyond startups, including in project management.
Startup Burn Rate & Runway: A Survival Guide
Covers current fundraising-market benchmarks for how much runway founders should target before going out to raise.
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Startup Runway Calculator — Frequently Asked Questions
Common questions founders ask before and after using our startup runway calculator.
Want to test your own numbers? Scroll back up and try the free startup runway calculator.
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