{
  "slug": "gutter",
  "title": "Gutter Calculator",
  "heading": "Gutter Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/gutter",
  "summary": "Gutter run, downspouts, and installed cost.",
  "description": "Rule of thumb: one downspout per 30 to 40 feet of gutter, and one per 600 to 800 square feet of roof drainage. Undersized downspouts overflow long before the gutter does.",
  "formula": "Downspouts = max(Run ÷ 35, Roof area ÷ 700), rounded up.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=gutter",
  "inputs": [
    {
      "id": "run",
      "label": "Total gutter run",
      "kind": "number",
      "hint": null,
      "default": 140,
      "unit": "ft",
      "min": 0,
      "max": null
    },
    {
      "id": "roofArea",
      "label": "Roof area draining",
      "kind": "number",
      "hint": null,
      "default": 1600,
      "unit": "sq ft",
      "min": 0,
      "max": null
    },
    {
      "id": "price",
      "label": "Gutter price",
      "kind": "number",
      "hint": null,
      "default": 9,
      "unit": "$/ft",
      "min": 0,
      "max": null
    },
    {
      "id": "downspoutPrice",
      "label": "Cost per downspout",
      "kind": "number",
      "hint": null,
      "default": 85,
      "unit": "$",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "total",
      "label": "Estimated total cost",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "downspouts",
      "label": "Downspouts needed",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "gutter",
      "label": "Gutter material",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "down",
      "label": "Downspout cost",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "perFoot",
      "label": "Cost per linear foot",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Total gutter run: 140 ft",
      "Roof area draining: 1600 sq ft",
      "Gutter price: 9 $/ft",
      "Cost per downspout: 85 $"
    ],
    "outputs": [
      "Estimated total cost: $1,600.00",
      "Downspouts needed: 4",
      "Gutter material: $1,260.00",
      "Downspout cost: $340.00",
      "Cost per linear foot: $11.43"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter total gutter run (ft).",
      "Enter roof area draining (sq ft).",
      "Enter gutter price ($/ft).",
      "Enter cost per downspout ($).",
      "Read your estimated total cost 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": {
        "run": 84,
        "roofArea": 950,
        "price": 5.3999999999999995,
        "downspoutPrice": 50
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "run": 140,
        "roofArea": 1600,
        "price": 9,
        "downspoutPrice": 85
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "run": 224,
        "roofArea": 2550,
        "price": 14.4,
        "downspoutPrice": 135
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "How does the gutter calculator work?",
      "a": "Rule of thumb: one downspout per 30 to 40 feet of gutter, and one per 600 to 800 square feet of roof drainage. Undersized downspouts overflow long before the gutter does. The underlying maths is: Downspouts = max(Run ÷ 35, Roof area ÷ 700), rounded up."
    },
    {
      "q": "What do I need to enter?",
      "a": "4 values: total gutter run, roof area draining, gutter price, and cost per downspout. 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 estimated total cost result mean?",
      "a": "It is returned as a money amount in US dollars 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. Estimates assume standard, average conditions — local rules, pricing, and materials vary."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/roofing",
    "https://www.revenuelab.fyi/toolbox/siding"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Gutter Calculator (https://www.revenuelab.fyi/toolbox/gutter)"
}