{
  "slug": "10x12-room-paint-calculator",
  "title": "10x12 Room Paint Calculator",
  "heading": "10x12 Room Paint Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/10x12-room-paint-calculator",
  "summary": "Gallons of paint and cost for a 10x12 room at standard 8-foot ceilings.",
  "description": "A 10x12 bedroom or office is one of the most common room sizes to paint. This calculator defaults to those dimensions with 8-foot ceilings, two coats, and standard door/window deductions, returning the gallons needed and total paint cost.",
  "formula": "Wall Area = 2 × (L + W) × Height − Openings. Gallons = (Wall Area × Coats) ÷ 350 sqft per gallon. Cost = Gallons × Price per Gallon.",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=10x12-room-paint-calculator",
  "inputs": [
    {
      "id": "length",
      "label": "Room length",
      "kind": "number",
      "hint": null,
      "default": 12,
      "unit": "ft",
      "min": 1,
      "max": null
    },
    {
      "id": "width",
      "label": "Room width",
      "kind": "number",
      "hint": null,
      "default": 10,
      "unit": "ft",
      "min": 1,
      "max": null
    },
    {
      "id": "height",
      "label": "Ceiling height",
      "kind": "number",
      "hint": null,
      "default": 8,
      "unit": "ft",
      "min": 6,
      "max": 14
    },
    {
      "id": "openings",
      "label": "Doors and windows area",
      "kind": "number",
      "hint": null,
      "default": 40,
      "unit": "sqft",
      "min": 0,
      "max": null
    },
    {
      "id": "coats",
      "label": "Number of coats",
      "kind": "number",
      "hint": null,
      "default": 2,
      "unit": null,
      "min": 1,
      "max": 3
    },
    {
      "id": "pricePerGallon",
      "label": "Price per gallon",
      "kind": "number",
      "hint": null,
      "default": 45,
      "unit": "$",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "gallons",
      "label": "Paint needed",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "cost",
      "label": "Estimated paint cost",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "wallArea",
      "label": "Paintable wall area",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Room length: 12 ft",
      "Room width: 10 ft",
      "Ceiling height: 8 ft",
      "Doors and windows area: 40 sqft",
      "Number of coats: 2",
      "Price per gallon: 45 $"
    ],
    "outputs": [
      "Paint needed: 2",
      "Estimated paint cost: $90",
      "Paintable wall area: 312"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter room length (ft).",
      "Enter room width (ft).",
      "Enter ceiling height (ft).",
      "Enter doors and windows area (sqft).",
      "Enter number of coats.",
      "Enter price per gallon ($).",
      "Read your paint needed 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": {
        "length": 7,
        "width": 6,
        "height": 8,
        "openings": 25,
        "coats": 1,
        "pricePerGallon": 27
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "length": 12,
        "width": 10,
        "height": 8,
        "openings": 40,
        "coats": 2,
        "pricePerGallon": 45
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "length": 19,
        "width": 16,
        "height": 8,
        "openings": 65,
        "coats": 3,
        "pricePerGallon": 72
      }
    }
  ],
  "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 many gallons of paint for a 10x12 room?",
      "a": "With 8-foot ceilings and two coats, about 1.5-2 gallons, depending on door/window area — most people round up to buy a full gallon can."
    },
    {
      "q": "Does this include the ceiling?",
      "a": "No, this covers wall area only; add ceiling square footage (length × width) separately if painting the ceiling too, since ceiling paint often differs from wall paint."
    },
    {
      "q": "Why does paint coverage vary from the 350 sqft/gallon standard?",
      "a": "Textured walls, dark color changes, and unprimed drywall all reduce actual coverage, sometimes to 250-300 sqft per gallon, so buy slightly more than the calculated minimum."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/12x12-room-paint-calculator",
    "https://www.revenuelab.fyi/toolbox/12x14-room-paint-calculator"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — 10x12 Room Paint Calculator (https://www.revenuelab.fyi/toolbox/10x12-room-paint-calculator)"
}