How to Calculate Startup Runway: Step-by-Step
The Startup Runway Calculator projects your company's financial longevity based on its current cash reserves, monthly expenses (burn rate), and revenue generation. It provides a clear timeline, enabling proactive decision-making to extend your operational period.
Bottom Line
Enter cash on hand, monthly burn, and current revenue to get runway in months, zero-cash date, and the revenue growth rate needed to reach break-even before cash runs out.
Startup Runway Calculator
Calculate months of runway from cash, burn rate, and revenue growth assumptions.
On This Page
What It Does
Use the calculator with intent
The Startup Runway Calculator projects your company's financial longevity based on its current cash reserves, monthly expenses (burn rate), and revenue generation. It provides a clear timeline, enabling proactive decision-making to extend your operational period.
Ideal for startup founders, entrepreneurs, and financial managers who need to understand their company's financial health and plan for the future. It's especially useful for pitch decks, fundraising strategies, and identifying critical points for cost reduction or revenue acceleration.
Interpreting Results
Start with Runway Months. Then compare Default Date before deciding what changes the answer most.
Input Steps
Field by field
- 1
Enter inputs
Enter cash on hand, monthly burn, current monthly revenue, expected monthly revenue growth, and any planned burn reduction. Use fully loaded burn including payroll, software, rent, and debt service so runway reflects real cash usage.
- 2
Read outputs
Read runway months, projected cash-out date, monthly cash projection, and break-even month. Fewer than 6 months of runway is usually acute, while 12-18 months gives most startups a healthier fundraising or restructuring window.
- 3
Compare results
Compare break-even month to cash-out month, not just to your optimism about growth. If break-even arrives after cash reaches zero, the current plan still fails even if the top-line narrative sounds attractive.
- 4
Use result
Use the projection to test a no-growth case, a modest growth case, and a burn-cut case before making hiring or fundraising decisions. If a 10% burn reduction adds more runway than an aggressive growth assumption, the operations lever is probably safer than the sales story.
- 5
Re-run
Re-run monthly after the close and after any staffing, pricing, or financing change. Track actual runway versus modeled runway because even one or two bad months can pull the cash-out date forward sharply.
Run one base case and one sensitivity case before trusting a single output.
Common Scenarios
Use realistic starting points
Baseline assumptions
Cash On Hand
$150,000
Monthly Burn
25000
Monthly Revenue
5000
Revenue Growth Pct
5
Check runway months against your fundraising timeline — if you need 6 months to close a round, runway under 9 months means you should start the process immediately or cut burn now.
Higher Cash On Hand
Cash On Hand
$180,000
Monthly Burn
25000
Monthly Revenue
5000
Revenue Growth Pct
5
Adding $30k in cash extends runway proportionally at constant burn, but the cash-out date may not shift as far as expected once revenue growth compounds into the picture. Watch whether break-even month falls inside or outside the new runway : if break-even still arrives after cash-out, more capital buys time but does not fix the fundamental problem.
Lower Monthly Burn
Cash On Hand
$150,000
Monthly Burn
21250
Monthly Revenue
5000
Revenue Growth Pct
5
A 15% burn reduction extends runway and, more importantly, may pull break-even inside the remaining window. Watch how many months earlier break-even arrives compared to the baseline : that delta shows the compounding benefit of lower burn: not just more months of cash but also a shorter distance to self-funding.
Try These Tools
Run the numbers next
FAQ
Questions people ask next
The short answers readers usually want after the first pass.
Sources & References
- What is a Burn Rate? — Investopedia
- How to Calculate Startup Runway & Why it Matters — Startups.com
Related Content
Keep the topic connected
What Is Burn Rate? Meaning, Formula & Runway
Burn rate is how fast a business spends cash before turning a profit. Learn gross vs net burn, the formula, and how it sets your startup runway.
What Is Runway? Startup Cash Runway Explained
Runway is how many months a startup can operate before cash runs out. Learn the formula, why it matters, and practical ways to extend your cash runway.