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.
How It Works
1
Enter Your Cash and Expenses
Input your current cash balance and monthly operating expenses (gross burn)
2
Add Revenue (Optional)
Enter your current MRR to calculate net burn and see your actual runway
3
See Your Runway and Cash-Out Date
Get your runway in months, the projected cash-out date, and scenario comparisons to extend it
Your Financials
Enter your current cash position and burn
Cash on Hand ($)
Monthly Operating Expenses ($)
Monthly Revenue ($)
Capital Events (Optional)
One-Time Cash Injection ($)
One-Time Expense ($)
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 Trajectory
Enter your financials20% Cost Reduction
Enter your financialsWith Revenue Growth (select rate)
Revenue compounds each monthStartup 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 Revenue
Cash 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.
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.
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
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
Burn Rate Calculator — Calculate net burn rate, cash runway, and burn multiple
ARR Calculator — Calculate annual recurring revenue from monthly subscriptions and annual contracts
MRR Calculator — Break down new, expansion, contraction, and churned MRR
Churn Rate Calculator — Measure customer and revenue churn with annualized projections
NRR Calculator — Track net revenue retention and gross revenue retention rates
Growth Rate Calculator — Calculate MoM, YoY, and CAGR growth rates from revenue data
Break-Even Calculator — Find the units and revenue needed to cover all costs and reach profitability
EBITDA Margin Calculator — Calculate EBITDA margin and benchmark against SaaS and industry norms
Customer Metrics
CAC Calculator — Measure customer acquisition cost and LTV:CAC ratio
LTV Calculator — Calculate customer lifetime value, lifespan, and LTV:CAC ratio
Payback Period Calculator — Calculate how long it takes to recover customer acquisition costs
Viral Coefficient Calculator — Measure your K-factor and model viral growth scenarios
Pricing & Valuation
Markup Calculator — Calculate markup percentage, selling price, profit, and gross margin
Equity Dilution Calculator — Model how funding rounds affect founder ownership over time
SaaS Valuation Calculator — Estimate your company value using ARR multiples and growth-rate benchmarks
Revenue Multiple Calculator — See what ARR multiple your growth rate, NRR, and gross margin justify
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.
See your months of runway update daily based on actual bank balances and spending. No spreadsheet refreshes needed.
Model best-case, worst-case, and expected scenarios side by side. Plan for growth while preparing for downturns.
Get notified when your runway drops below key thresholds. Take action early instead of discovering cash problems at the last moment.
Track how your runway has changed over time. Understand if your business is becoming more or less capital efficient.
Running short on runway? See how much non-dilutive capital you qualify for based on your recurring revenue.
Frequently Asked Questions
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.
- Net Burn Rate = Monthly Expenses − Monthly Revenue
- Cash Runway = Cash on Hand ÷ Net Burn Rate
Always use net burn (not gross burn) for runway calculations, since revenue reduces how fast you actually drain cash.
- 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
- 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.
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.
- 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.
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