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RunwayCalculator
Venture & Seed Stage Financial Engine

Startup Runway Calculator

Calculate how many months your venture money will last. Model compound revenue growth, employee payroll burn, and one-time upcoming capital expenses.

Interactive Startup Runway & Cash Burn Calculator

Click to test scenario
Liquid reserves
Gross Burn
预计现金存续期 (Runway)
已进入自循环盈利 (Default Alive)
收支平衡 / 实现盈利

You are generating positive net cash flow of $37,000/month. Your cash balance is growing.

预计资金告罄日期:Indefinite
月度净现金消耗额 (Net Burn):US$37,000/mo
月度净现金消耗额 (Net Burn)
US$37,000
Expenses − Revenue
月度总运营支出 (Gross Burn)
US$55,000
Total monthly outlays
当前账面可用现金余额 ($)
US$600,000
Liquid reserves balance
盈亏平衡状态
Monthly sales required to eliminate cash burn entirely: US$55,000/month
距离盈亏平衡所需月收入差额: +US$37,000/mo
Projected Cash Remaining
Based on trajectory
After 3 MonthsUS$490,113
After 6 MonthsUS$385,100
After 12 MonthsUS$203,923

未来 24 个月现金流趋势推演

结合复合增长率的月度现金消耗轨迹折线图。

现金余额
Zero Cash Threshold
$0$208k$416k$630kM1M4M7M10M13M16M19M22M24
Hover or tap any month marker to inspect exact projected cash balance, revenue, and burn for that period.

假设情景敏感度分析 (What-If)

评估即时缩减支出、提振销售或注入过桥资金对企业生存周期的延长效果。

Reduce expenses by 5%Sustainable

Save $2,750/mo (new expenses: $52,250/mo)

Runway:
SustainableSustainable / Infinite
Reduce expenses by 10%Sustainable

Save $5,500/mo (new expenses: $49,500/mo)

Runway:
SustainableSustainable / Infinite
Reduce expenses by 20%Sustainable

Save $11,000/mo (new expenses: $44,000/mo)

Runway:
SustainableSustainable / Infinite
Financial Calculation Methodology & Transparency

How the Runway Calculator Works: Mathematical Model & Assumptions

1. Static Cash Runway Formula

For businesses with steady revenue and predictable overhead, runway is determined by dividing liquid cash reserves by net monthly cash deficit:

Runway (months) = Available Cash ÷ Net Monthly Burn

2. Gross Burn vs. Net Burn

  • Gross Burn: Total cash disbursed each month (payroll, contractors, hosting, rent, utilities).
  • Net Burn: Gross monthly expenses minus total monthly cash revenue collections.
  • Break-Even: When Net Burn $\le$ $0$, cash runway is mathematically sustainable or infinite.

3. Dynamic Growth Projections & Interpolation

When revenue growth or expense inflation rates are enabled, the engine calculates month-by-month compound flows up to 60 months:

Ending Cash(m) = Beginning Cash(m) + Revenue(m) - Expenses(m)
Fractional Month = Beginning Cash(depletion) ÷ Monthly Net Burn

We linearly interpolate the exact day/fraction when cash reaches $0, avoiding arbitrary rounded whole months.

4. Client-Side Privacy Guarantee

Every financial computation executes exclusively inside your local browser runtime. No financial balances, revenue figures, or payroll numbers are sent to any remote server or database.

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Startup Runway Frequently Asked Questions

Everything you need to know about cash runway, burn rates, and financial planning.

VC-backed startups should ideally target 18 to 24 months of runway following a funding round. This gives founders 12 to 18 months to reach critical traction milestones (e.g. $1M ARR or proof of PMF) plus a mandatory 6-month window to pitch and close their next round.