{
  "slug": "interior-painting-cost",
  "title": "Interior Painting Cost Calculator",
  "heading": "Interior Painting Cost Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/interior-painting-cost",
  "summary": "Room-by-room painting cost from square footage, coats, and prep condition.",
  "description": "Interior painting is priced two ways: per square foot of wall area, or per room. Pros quote from wall area because that is what actually drives labor — a 12x12 room with 9-foot ceilings has roughly 430 square feet of wall, and a painter covering about 175 square feet per hour with cut-in work spends far longer on a room with heavy patching, trim, or dark colors needing three coats. This calculator takes your total painted wall area, the number of coats, a prep condition multiplier for patching and caulking, and your local labor rate, then adds paint at roughly 350 square feet of coverage per gallon. 2026 US national averages land near $2.00-$4.50 per square foot of wall area for walls-only work with mid-grade paint, higher when ceilings and trim are included. Enter your own painter's quote rate to compare bids honestly.",
  "formula": "Cost = (Wall Area × Coats × Labor Rate × Prep Multiplier) + (Wall Area × Coats ÷ Coverage per Gallon × Paint Price).",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=interior-painting-cost",
  "inputs": [
    {
      "id": "wallArea",
      "label": "Total wall area to paint",
      "kind": "number",
      "hint": null,
      "default": 900,
      "unit": "sq ft",
      "min": 50,
      "max": 20000
    },
    {
      "id": "coats",
      "label": "Coats",
      "kind": "number",
      "hint": null,
      "default": 2,
      "unit": null,
      "min": 1,
      "max": 4
    },
    {
      "id": "laborRate",
      "label": "Labor rate per sq ft per coat",
      "kind": "number",
      "hint": null,
      "default": 1.1,
      "unit": "$",
      "min": 0.3,
      "max": 4
    },
    {
      "id": "prep",
      "label": "Prep condition",
      "kind": "select",
      "hint": null,
      "default": "1",
      "options": [
        {
          "value": "0.9",
          "label": "Clean new drywall — light prep"
        },
        {
          "value": "1",
          "label": "Normal — minor patching"
        },
        {
          "value": "1.25",
          "label": "Heavy patching, caulking, sanding"
        },
        {
          "value": "1.5",
          "label": "Damaged walls / wallpaper removal"
        }
      ]
    },
    {
      "id": "paintPrice",
      "label": "Paint price per gallon",
      "kind": "number",
      "hint": null,
      "default": 48,
      "unit": "$",
      "min": 15,
      "max": 120
    },
    {
      "id": "coverage",
      "label": "Coverage per gallon",
      "kind": "number",
      "hint": null,
      "default": 350,
      "unit": "sq ft",
      "min": 200,
      "max": 450
    }
  ],
  "outputs": [
    {
      "id": "totalCost",
      "label": "Total interior painting cost",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "laborCost",
      "label": "Labor",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "paintCost",
      "label": "Paint material",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "gallons",
      "label": "Gallons to buy",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "perSqFt",
      "label": "Cost per sq ft of wall",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Total wall area to paint: 900 sq ft",
      "Coats: 2",
      "Labor rate per sq ft per coat: 1.1 $",
      "Prep condition: Normal — minor patching",
      "Paint price per gallon: 48 $",
      "Coverage per gallon: 350 sq ft"
    ],
    "outputs": [
      "Total interior painting cost: $2,268",
      "Labor: $1,980",
      "Paint material: $288",
      "Gallons to buy: 6",
      "Cost per sq ft of wall: $2.52"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter total wall area to paint (sq ft).",
      "Enter coats.",
      "Enter labor rate per sq ft per coat ($).",
      "Enter prep condition.",
      "Enter paint price per gallon ($).",
      "Enter coverage per gallon (sq ft).",
      "Read your total interior painting 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": {
        "wallArea": 550,
        "coats": 1,
        "laborRate": 0.66,
        "prep": "1",
        "paintPrice": 29,
        "coverage": 210
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "wallArea": 900,
        "coats": 2,
        "laborRate": 1.1,
        "prep": "1",
        "paintPrice": 48,
        "coverage": 350
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "wallArea": 1450,
        "coats": 3,
        "laborRate": 1.7600000000000002,
        "prep": "1",
        "paintPrice": 77,
        "coverage": 450
      }
    }
  ],
  "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 do I figure my wall area?",
      "a": "Add the length of every wall in the room, multiply by ceiling height, then subtract roughly 20 sq ft per door and 15 sq ft per average window. Painters usually skip the deductions on small openings because cut-in work around them takes just as long."
    },
    {
      "q": "Do dark colors really cost more?",
      "a": "Often yes — deep reds, navies, and going from dark to light frequently need a tinted primer plus three coats instead of two, which is a 50% jump in both paint and labor."
    },
    {
      "q": "Is per-room pricing ever better?",
      "a": "For a single small room, flat per-room pricing (commonly $350-$800 for a bedroom in 2026) can beat square-foot math because it bundles setup and travel. For whole-house work, square-foot pricing is usually more honest."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/drywall-installation-cost",
    "https://www.revenuelab.fyi/toolbox/popcorn-ceiling-removal-cost"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Interior Painting Cost Calculator (https://www.revenuelab.fyi/toolbox/interior-painting-cost)"
}