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Startup Runway Calculator

Calculate how many months of cash you have left and when your money runs out. Model scenarios to see how cost reductions and revenue growth extend your startup runway.
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  • Free Calculator
  • Interactive
  • Real-time Results

This calculator is powered by Founderpath — built to help founders access capital faster, deploy it smarter, and stay in control of their cash flow.

How it works

3 steps · Instant results
  1. 01
    Enter Your Cash and ExpensesInput your current cash balance and monthly operating expenses (gross burn)
  2. 02
    Add Revenue (Optional)Enter your current MRR to calculate net burn and see your actual runway
  3. 03
    See Your Runway and Cash-Out DateGet your runway in months, the projected cash-out date, and scenario comparisons to extend it
The calculator
Free · No email · Runs in your browser

Your Financials

Enter your current cash position and burn

Total cash in your bank account right now

Total monthly spend — payroll, infrastructure, tools, rent

Current MRR — leave blank if pre-revenue

Expected month-over-month revenue growth

Capital Events (Optional)

VC investment, loan, asset sale, or any one-time cash in

Severance, equipment, legal fees, or any one-time cash out

Runway Results

How long your cash will last

Enter your cash and expenses above to see your runway

Key Insights

  • 18–24 months is the target runway after a raise. Below 12 months, begin fundraising now — the process takes 3–6 months.
  • A 20% cost reduction can add several months to your runway without dilution.
  • Non-dilutive capital like revenue-based financing can extend runway immediately — no equity, no board seats.

Runway by Scenario

How different strategies extend your runway (months)

Enter your cash and expenses to see scenario comparisons

Scenario Comparison

How each strategy changes your runway

Current TrajectoryEnter your financials
—
20% Cost ReductionEnter your financials
—
With Revenue Growth (select rate)Revenue compounds each month
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The guide

Startup Runway Calculator: Cash Runway Formula & Benchmarks

Know exactly how long your cash lasts — and what to do when it's running low

What Is Startup Runway?

Startup runway is the number of months a company can operate before running out of cash at its current burn rate. It's one of the most important metrics a founder tracks because it determines how much time you have to hit milestones, close your next funding round, or reach profitability. Runway is not a static number — it changes as you adjust spending, grow revenue, or raise capital. A short runway creates existential pressure; a long runway gives you strategic optionality.

How to Calculate Startup Runway

The startup runway formula uses two numbers: your cash balance and your net burn rate.

Net Burn Rate = Monthly Expenses − Monthly RevenueCash Runway (months) = Cash on Hand ÷ Net Burn Rate

What each input means:

  • Cash on hand: Your total bank balance — the actual cash available to fund operations, not including receivables or credit lines you haven't drawn
  • Monthly expenses: Total operating costs — payroll, infrastructure, rent, software, and marketing spend
  • Monthly revenue: Current MRR — subtracting this from expenses gives you net burn, the actual cash you lose each month
  • Revenue growth rate: Expected month-over-month MRR growth used to model the “With Growth” scenario — how faster revenue compresses net burn over time
  • One-time cash injection (optional): A lump-sum cash addition — VC investment, loan, asset sale — that increases your starting cash pool without changing monthly burn
  • One-time expense (optional): A lump-sum cash outflow — severance, equipment, legal fees — that reduces your starting cash pool before the runway calculation runs

Example: With $600,000 in the bank, $120,000/month in expenses, and $40,000/month in revenue, your net burn is $80,000/month and your runway is 7.5 months — dangerously short. To see how runway evolves as revenue grows and costs rise over the next two years, build a full forecast with the SaaS Financial Model Template.

Startup Runway Benchmarks by Stage

How much runway is enough depends on your stage, burn rate, and how close you are to a milestone that unlocks the next fundraise:

24+ months — Healthy

You have breathing room. Focus on growth, not survival. Use this time to hit the metrics that maximize your valuation at the next raise (ARR, NRR, growth rate) rather than cutting costs.

12–24 months — Begin Planning

Target runway after a fundraise. If you're at 12–18 months, start fundraising conversations now — the process takes 3–6 months, and you want to close a round with 18+ months remaining.

6–12 months — Fundraise Actively

You're in the fundraising window. Make it your top priority alongside continuing to run the business. Consider bridge rounds, non-dilutive capital, or cost reductions to buy more time.

Under 6 months — Critical

Immediate action required. Reduce burn aggressively, pursue emergency bridge financing, or run a fast process with existing investors. At under 3 months, the company is in existential territory.

When to Start Fundraising Based on Runway

The most common fundraising mistake is starting too late. Here's how to think about timing:

  • Start at 18 months: Begin warm introductions and inbound conversations with investors at 18 months of runway. You have leverage, you're not desperate, and you can be selective about which investors you pursue.
  • Run a process at 12 months: Begin a structured fundraising process. Average seed to Series A timeline is 3–4 months; Series A to B is 4–6 months. The process consumes significant founder bandwidth.
  • Consider alternatives at 6 months: If a venture round isn't imminent, evaluate non-dilutive options — revenue-based financing, venture debt, or cost reductions — to extend runway to a stronger position. Before assuming debt is one of them, check how much your recurring revenue can actually service with the SaaS Debt Capacity Calculator — it shows runway before and after the repayment, which is the case where borrowing makes runway shorter.

How to Extend Your Startup Runway

Reduce Expenses

  • Audit your SaaS stack: Most companies overspend on tools by 20–30%. Quarterly audits typically uncover significant waste in unused subscriptions and overlapping tools.
  • Right-size cloud infrastructure: Infrastructure costs often balloon with scale. Reserved instances, auto-scaling, and regular cost optimization can cut cloud spend by 20–40%.
  • Delay non-critical hires: Each new hire extends your hiring timeline by 3–6 months and significantly increases burn. Prioritize roles that directly drive revenue.

Accelerate Revenue

  • Expand existing customers: Upselling current customers costs a fraction of acquiring new ones and directly reduces net burn by increasing revenue
  • Offer annual prepay discounts: Converting monthly customers to annual contracts brings in cash upfront, improving your cash position even if it reduces monthly MRR slightly

Access Non-Dilutive Capital

  • Revenue-based financing: SaaS companies with recurring revenue can access capital against their ARR without giving up equity. Founderpath provides funding in days — not months — based on MRR metrics
  • Venture debt: Available to post-Series A companies as a complement to equity rounds. Typically 20–30% of the equity raised, used as a runway extension
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Related SaaS Calculators

Runway is one piece of your startup's financial picture. Use these calculators to track the metrics that drive it:

Financial Health

Beyond the calculator

Still forecasting runway with static models?

Get a live runway count from your bank data.

Founderpath connects your bank accounts and shows exactly how many months of runway you have. Updated daily as transactions flow in — no manual updates.

Try Founderpath Free
  • Live runway dashboardSee your months of runway update daily based on actual bank balances and spending. No spreadsheet refreshes needed.
  • Multiple scenario viewsModel best-case, worst-case, and expected scenarios side by side. Plan for growth while preparing for downturns.
  • Runway alertsGet notified when your runway drops below key thresholds. Take action early instead of discovering cash problems at the last moment.
  • Historical trendingTrack how your runway has changed over time. Understand if your business is becoming more or less capital efficient.
  • Extend runway without dilutionRunning short on runway? See how much non-dilutive capital you qualify for based on your recurring revenue.
Questions
10 answers

Frequently asked questions

Startup runway is the number of months your company can continue operating before running out of cash, given your current burn rate. It answers the question: how long do we have?

Runway is calculated using: Cash Runway = Cash on Hand ÷ Net Burn Rate

Net burn rate is your monthly expenses minus monthly revenue. Runway is a forward-looking metric — it assumes your current burn rate continues unchanged, which is why scenario modeling (showing the impact of cost cuts and revenue growth) is so useful.
Two steps:
  1. Net Burn Rate = Monthly Expenses − Monthly Revenue
  2. Cash Runway = Cash on Hand ÷ Net Burn Rate
Example: $500,000 cash, $80,000/month expenses, $20,000/month revenue → net burn = $60,000/month → runway = 8.3 months.

Always use net burn (not gross burn) for runway calculations, since revenue reduces how fast you actually drain cash.
General benchmarks:
  • 24+ months — healthy, focus on growth
  • 18–24 months — target runway after closing a round
  • 12–18 months — begin fundraising conversations
  • 6–12 months — actively fundraising; consider alternatives
  • Under 6 months — critical; immediate action required
The key insight: fundraising takes 3–6 months. If you start when you have 6 months of runway, you may not close in time.
Start earlier than you think. Guidelines:
  • 18 months: Begin warm relationship-building with target investors. No urgency, full leverage.
  • 12 months: Run a structured fundraising process. This is your optimal window.
  • 6 months: You're fundraising under pressure. Explore non-dilutive bridges to extend runway to a stronger position.
The best fundraising happens when you don't need the money. Investors can sense desperation and it weakens your negotiating position.
Gross burn is your total monthly operating expenses — every dollar going out the door, before accounting for revenue.

Net burn is gross burn minus monthly revenue — the actual cash you lose each month.

Example: $100,000/month expenses, $40,000/month revenue → gross burn = $100,000, net burn = $60,000.

Always use net burn for runway calculations. Using gross burn overstates how fast you drain cash and understates your true runway.
Several proven approaches:
  • Reduce expenses: Audit your SaaS stack (most companies overspend by 20–30%), right-size cloud infrastructure, and delay non-critical hires.
  • Accelerate revenue: Upsell existing customers, offer annual prepay discounts for upfront cash, and reduce churn.
  • Non-dilutive capital: Revenue-based financing uses your recurring revenue as collateral — no equity, no board seats. Founderpath funds SaaS companies in days based on MRR.
  • Venture debt: Post-Series A companies can extend runway with 20–30% additional capital via venture debt alongside their equity round.
Runway = Cash on Hand ÷ Net Burn Rate. Plug in your current cash balance and monthly net burn (expenses minus revenue) and you have your answer in one division.

The formula applies to any company — not just venture-backed startups. The most common mistakes are using gross burn instead of net burn (which understates your runway) and calculating it once instead of recalculating monthly as your burn rate shifts.
A startup runway calculator is only as accurate as the burn rate you feed it — it assumes your current net burn stays constant, so it won't predict a new hire, a pricing change, or a funding event on its own.

Treat the output as a snapshot, not a forecast. Recalculate monthly with your latest cash and burn numbers, and use the scenario modeling above to see how a cost cut or a revenue jump shifts your runway.
No. A burn rate calculator outputs one number — how much cash you're losing per month. A cash runway calculator takes that burn rate and divides it into your cash balance to answer a different question: how many months until you hit $0.

If you only need the monthly burn figure, try the Burn Rate Calculator. If you need the full runway and fundraising timeline, use the calculator above.
We're here to help. Contact the Founderpath team or try the free Startup Runway Calculator above to see exactly how long your cash lasts and what you can do to extend it.