{
  "slug": "grant-runway",
  "title": "Startup Runway Calculator",
  "heading": "Startup Runway & Burn Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/grant-runway",
  "summary": "Months of cash left and the revenue needed to extend it.",
  "description": "Runway is cash divided by net burn. This also shows what revenue growth would buy you an extra six months without raising.",
  "formula": "Runway = cash ÷ (expenses − revenue)",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=grant-runway",
  "inputs": [
    {
      "id": "cash",
      "label": "Cash in bank",
      "kind": "number",
      "hint": null,
      "default": 600000,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "expenses",
      "label": "Monthly expenses",
      "kind": "number",
      "hint": null,
      "default": 85000,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "revenue",
      "label": "Monthly revenue",
      "kind": "number",
      "hint": null,
      "default": 30000,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "growth",
      "label": "Monthly revenue growth",
      "kind": "number",
      "hint": null,
      "default": 8,
      "unit": "%",
      "min": 0,
      "max": 60
    }
  ],
  "outputs": [
    {
      "id": "months",
      "label": "Runway with growth (months)",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "verdict",
      "label": "Status",
      "format": "raw",
      "hint": null,
      "primary": false
    },
    {
      "id": "flatRunway",
      "label": "Runway at flat revenue (months)",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "burn",
      "label": "Current net burn",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "breakeven",
      "label": "Revenue needed to break even",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Cash in bank: 600000 $",
      "Monthly expenses: 85000 $",
      "Monthly revenue: 30000 $",
      "Monthly revenue growth: 8 %"
    ],
    "outputs": [
      "Runway with growth (months): 120",
      "Status: Default alive — growth outruns burn",
      "Runway at flat revenue (months): 10.9",
      "Current net burn: $55,000",
      "Revenue needed to break even: $85,000"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter cash in bank ($).",
      "Enter monthly expenses ($).",
      "Enter monthly revenue ($).",
      "Enter monthly revenue growth (%).",
      "Read your runway with growth (months) on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "cash": 360000,
        "expenses": 51000,
        "revenue": 18000,
        "growth": 5
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "cash": 600000,
        "expenses": 85000,
        "revenue": 30000,
        "growth": 8
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "cash": 960000,
        "expenses": 136000,
        "revenue": 48000,
        "growth": 13
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "How does the startup runway & burn calculator work?",
      "a": "Runway is cash divided by net burn. This also shows what revenue growth would buy you an extra six months without raising. The underlying maths is: Runway = cash ÷ (expenses − revenue)"
    },
    {
      "q": "What do I need to enter?",
      "a": "4 values: cash in bank, monthly expenses, monthly revenue, and monthly revenue growth. Each field starts with a sensible default, so you can change one number at a time and watch the result move."
    },
    {
      "q": "What does the runway with growth (months) result mean?",
      "a": "It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds."
    },
    {
      "q": "Is this calculator free, and do I need an account?",
      "a": "Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser."
    },
    {
      "q": "How accurate is the result?",
      "a": "It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs."
    }
  ],
  "related": [],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Startup Runway Calculator (https://www.revenuelab.fyi/toolbox/grant-runway)"
}