Interior Painting Estimate Calculator

Use this calculator to estimate the cost of your interior painting project. Input the dimensions of your rooms, desired number of paint coats, and typical costs for paint and labor to get a detailed breakdown.

Number of Rooms:

Average Room Length (feet):

Average Room Width (feet):

Average Room Height (feet):

Number of Paint Coats:

Paint Cost per Gallon ($):

Labor Rate per Hour ($):

Prep Work Time per Room (hours):

Include Ceiling Painting

Include Trim Painting

function calculatePaintingEstimate() { var numRooms = parseFloat(document.getElementById('numRooms').value); var roomLength = parseFloat(document.getElementById('roomLength').value); var roomWidth = parseFloat(document.getElementById('roomWidth').value); var roomHeight = parseFloat(document.getElementById('roomHeight').value); var numCoats = parseFloat(document.getElementById('numCoats').value); var paintCostPerGallon = parseFloat(document.getElementById('paintCostPerGallon').value); var laborRatePerHour = parseFloat(document.getElementById('laborRatePerHour').value); var prepTimePerRoom = parseFloat(document.getElementById('prepTimePerRoom').value); var paintCeilings = document.getElementById('paintCeilings').checked; var paintTrim = document.getElementById('paintTrim').checked; var resultDiv = document.getElementById('result'); resultDiv.innerHTML = "; // Clear previous results // Input validation if (isNaN(numRooms) || numRooms <= 0 || isNaN(roomLength) || roomLength <= 0 || isNaN(roomWidth) || roomWidth <= 0 || isNaN(roomHeight) || roomHeight <= 0 || isNaN(numCoats) || numCoats <= 0 || isNaN(paintCostPerGallon) || paintCostPerGallon < 0 || isNaN(laborRatePerHour) || laborRatePerHour < 0 || isNaN(prepTimePerRoom) || prepTimePerRoom < 0) { resultDiv.innerHTML = 'Please enter valid positive numbers for all fields.'; return; } // Constants for calculations var paintCoveragePerGallon = 350; // sq ft per gallon per coat var wallPaintingRate = 100; // sq ft per hour for one coat var ceilingPaintingRate = 150; // sq ft per hour for one coat var trimLaborPerRoomPerCoat = 1.5; // hours per room per coat for trim // 1. Calculate Surface Areas var wallAreaPerRoom = 2 * (roomLength + roomWidth) * roomHeight; var totalWallArea = wallAreaPerRoom * numRooms; var ceilingAreaPerRoom = roomLength * roomWidth; var totalCeilingArea = paintCeilings ? (ceilingAreaPerRoom * numRooms) : 0; var totalPaintableArea = totalWallArea + totalCeilingArea; // 2. Calculate Paint Needed and Cost var gallonsNeeded = (totalPaintableArea / paintCoveragePerGallon) * numCoats; var totalPaintCost = gallonsNeeded * paintCostPerGallon; // 3. Calculate Labor Hours and Cost var totalPrepHours = prepTimePerRoom * numRooms; var wallPaintingHours = (totalWallArea / wallPaintingRate) * numCoats; var ceilingPaintingHours = paintCeilings ? ((totalCeilingArea / ceilingPaintingRate) * numCoats) : 0; var trimPaintingHours = paintTrim ? (trimLaborPerRoomPerCoat * numRooms * numCoats) : 0; var totalPaintingHours = wallPaintingHours + ceilingPaintingHours + trimPaintingHours; var totalLaborHours = totalPrepHours + totalPaintingHours; var totalLaborCost = totalLaborHours * laborRatePerHour; // 4. Total Estimate var totalEstimate = totalPaintCost + totalLaborCost; // Display Results var resultsHTML = '

Estimated Painting Costs:

'; resultsHTML += 'Total Wall Area: ' + totalWallArea.toFixed(2) + ' sq ft'; if (paintCeilings) { resultsHTML += 'Total Ceiling Area: ' + totalCeilingArea.toFixed(2) + ' sq ft'; } resultsHTML += 'Total Paintable Area: ' + totalPaintableArea.toFixed(2) + ' sq ft'; resultsHTML += 'Estimated Gallons of Paint Needed: ' + gallonsNeeded.toFixed(2) + ' gallons (consider rounding up for purchase)'; resultsHTML += 'Estimated Paint Cost: $' + totalPaintCost.toFixed(2) + "; resultsHTML += 'Estimated Labor Hours: ' + totalLaborHours.toFixed(2) + ' hours'; resultsHTML += 'Estimated Labor Cost: $' + totalLaborCost.toFixed(2) + "; resultsHTML += '

Total Estimated Project Cost: $' + totalEstimate.toFixed(2) + '

'; resultDiv.innerHTML = resultsHTML; } .calculator-container { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f9f9f9; padding: 25px; border-radius: 10px; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); max-width: 700px; margin: 20px auto; border: 1px solid #e0e0e0; } .calculator-container h2 { text-align: center; color: #333; margin-bottom: 20px; font-size: 1.8em; } .calculator-container p { margin-bottom: 15px; line-height: 1.6; color: #555; } .calc-input-group { margin-bottom: 15px; display: flex; flex-direction: column; } .calc-input-group label { margin-bottom: 7px; font-weight: bold; color: #444; font-size: 0.95em; } .calc-input-group input[type="number"], .calc-input-group input[type="text"] { padding: 10px; border: 1px solid #ccc; border-radius: 5px; font-size: 1em; width: 100%; box-sizing: border-box; } .calc-input-group input[type="checkbox"] { margin-right: 10px; transform: scale(1.2); } .checkbox-group { flex-direction: row; align-items: center; } .checkbox-group label { margin-bottom: 0; font-weight: normal; } .calculate-button { display: block; width: 100%; padding: 12px 20px; background-color: #007bff; color: white; border: none; border-radius: 5px; font-size: 1.1em; font-weight: bold; cursor: pointer; transition: background-color 0.3s ease; margin-top: 20px; } .calculate-button:hover { background-color: #0056b3; } .calculator-results { margin-top: 30px; padding: 20px; background-color: #e9f7ef; border: 1px solid #d4edda; border-radius: 8px; color: #155724; } .calculator-results h3 { color: #0056b3; margin-top: 0; margin-bottom: 15px; font-size: 1.5em; text-align: center; } .calculator-results p { margin-bottom: 8px; font-size: 1em; color: #333; } .calculator-results .highlight { color: #28a745; font-size: 1.6em; font-weight: bold; } .calculator-results .error { color: #dc3545; font-weight: bold; text-align: center; }

Understanding Your Interior Painting Estimate

Interior painting can dramatically refresh the look and feel of your home. However, accurately estimating the cost can be complex, involving various factors beyond just the price of paint. Our Interior Painting Estimate Calculator helps you break down these costs to get a clearer picture of your potential investment.

Key Factors Influencing Painting Costs:

Number and Size of Rooms: Naturally, more rooms and larger rooms require more paint and labor. The calculator considers the length, width, and height to determine the total wall and ceiling surface area.
Number of Paint Coats: Most projects require two coats for optimal coverage and color depth, especially when changing colors significantly. More coats mean more paint and more labor time.
Paint Quality and Cost: The price of paint per gallon varies widely based on brand, quality, and finish (e.g., flat, eggshell, satin, semi-gloss). Higher-quality paints often offer better coverage, durability, and a richer finish.
Labor Rate: Professional painters charge an hourly rate or a flat fee per project. This rate can depend on their experience, location, and the complexity of the job. Our calculator uses an average hourly rate for labor.
Prep Work: This crucial step includes cleaning surfaces, patching holes, sanding, taping, and priming. Adequate prep work ensures a smooth, long-lasting finish but adds to the overall labor time.
Ceiling Painting: Painting ceilings adds to the total paintable area and requires additional labor, often at a slightly different rate due to the overhead work.
Trim Painting: Baseboards, crown molding, door frames, and window sills require meticulous work. Including trim painting significantly increases labor hours due to the precision and detail involved.

How to Use the Calculator:

Simply input the requested details into the fields above. Provide the average dimensions if your rooms vary slightly, or calculate for each room individually and sum them up. Select whether you want to include ceiling and trim painting. Click "Calculate Estimate" to see a breakdown of estimated paint cost, labor cost, and the total project cost.

Interpreting Your Results:

The calculator provides an estimated cost based on standard industry averages for paint coverage and labor efficiency. Keep in mind that these are estimates. Actual costs may vary based on:

Specific paint brands and types chosen.
The condition of your walls (e.g., extensive repairs needed).
The complexity of the room (e.g., high ceilings, intricate architectural details).
Geographic location and local labor rates.
Any additional services like furniture moving or extensive cleanup.

This tool is designed to give you a solid starting point for budgeting your interior painting project. For a precise quote, always consult with professional painting contractors who can assess your specific needs on-site.