Wallpaper Square Footage Calculator

Wallpaper Square Footage Calculator

Room Dimensions:

Wallpaper Roll Dimensions:

Waste & Openings:

function calculateWallpaper() { var roomLength = parseFloat(document.getElementById('roomLength').value); var roomWidth = parseFloat(document.getElementById('roomWidth').value); var roomHeight = parseFloat(document.getElementById('roomHeight').value); var rollWidthInches = parseFloat(document.getElementById('rollWidth').value); var rollLengthFeet = parseFloat(document.getElementById('rollLength').value); var wastePercentage = parseFloat(document.getElementById('wastePercentage').value); var numOpenings = parseFloat(document.getElementById('numOpenings').value); var openingHeight = parseFloat(document.getElementById('openingHeight').value); var openingWidth = parseFloat(document.getElementById('openingWidth').value); // Input validation if (isNaN(roomLength) || isNaN(roomWidth) || isNaN(roomHeight) || isNaN(rollWidthInches) || isNaN(rollLengthFeet) || isNaN(wastePercentage) || isNaN(numOpenings) || isNaN(openingHeight) || isNaN(openingWidth) || roomLength <= 0 || roomWidth <= 0 || roomHeight <= 0 || rollWidthInches <= 0 || rollLengthFeet <= 0 || wastePercentage < 0 || numOpenings < 0 || openingHeight < 0 || openingWidth < 0) { document.getElementById('calculatedWallArea').innerText = 'Invalid Input'; document.getElementById('rollsNeeded').innerText = 'Invalid Input'; alert('Please enter valid positive numbers for all fields.'); return; } // Convert roll width from inches to feet var rollWidthFeet = rollWidthInches / 12; // 1. Calculate total wall area var totalWallArea = 2 * (roomLength + roomWidth) * roomHeight; // 2. Calculate area of doors/windows var openingsArea = numOpenings * openingHeight * openingWidth; // 3. Calculate net wall area (subtract openings) var netWallArea = totalWallArea – openingsArea; if (netWallArea < 0) { netWallArea = 0; // Cannot have negative wall area } // 4. Calculate area per wallpaper roll var rollArea = rollWidthFeet * rollLengthFeet; // 5. Calculate required area including waste/pattern match var requiredAreaWithWaste = netWallArea * (1 + (wastePercentage / 100)); // 6. Calculate number of rolls needed (round up) var rollsNeeded = Math.ceil(requiredAreaWithWaste / rollArea); // Display results document.getElementById('calculatedWallArea').innerText = netWallArea.toFixed(2); document.getElementById('rollsNeeded').innerText = rollsNeeded; } // Run calculation on page load with default values window.onload = calculateWallpaper;

Understanding Your Wallpaper Needs

Wallpapering a room can dramatically transform its look and feel. However, one of the most common challenges is accurately determining how much wallpaper you'll need. Buying too little means delays and potential color matching issues with different dye lots, while buying too much can be a costly waste. Our Wallpaper Square Footage Calculator is designed to help you get a precise estimate, ensuring your project goes smoothly.

How to Use the Calculator

1. Measure Your Room: Accurately measure the length, width, and height of your room in feet. Enter these values into the respective fields.
2. Know Your Wallpaper Roll: Check the packaging or product description for the width (usually in inches) and length (usually in feet) of your chosen wallpaper rolls. Input these dimensions.
3. Account for Waste and Pattern Match: Wallpapering often involves waste due to cutting, trimming, and especially pattern matching. A typical waste percentage ranges from 10% for plain papers to 20% or more for large, intricate patterns. If your wallpaper has a large repeat, consider adding a higher percentage.
4. Factor in Doors and Windows: While you might think you don't need wallpaper for these areas, it's crucial to subtract their area from the total wall space. Measure the average height and width of your doors and windows, and count how many there are. The calculator will automatically deduct this area.
5. Calculate: Click the "Calculate Wallpaper Needed" button to see your estimated net wall area and the total number of rolls required.

Why Accurate Measurement Matters

The primary reason for precise measurement is to avoid the pitfalls of under or over-ordering. Wallpaper, especially designer or custom prints, can be expensive. Furthermore, different production batches (dye lots) can have subtle color variations. If you run out and need to order more later, there's a risk the new rolls won't perfectly match the ones you've already hung.

Tips for Wallpapering Success

• Measure Twice, Cut Once: This old adage is particularly true for wallpaper. Double-check all your room and roll measurements.
• Consider the Pattern Repeat: If your wallpaper has a large pattern repeat, you'll need more waste. Some experts recommend adding an extra roll for every 6-8 rolls calculated for complex patterns.
• Ceiling Height: For rooms with varying ceiling heights or sloped ceilings, use the average height or calculate each wall section separately for maximum accuracy.
• Buy an Extra Roll: It's often a good idea to purchase one extra roll beyond what the calculator suggests, especially for first-time wallpaper hangers or if the pattern is intricate. This provides a buffer for mistakes, future repairs, or if a roll is damaged. Keep the extra roll in its original packaging in a cool, dry place.
• Prep Your Walls: Ensure your walls are clean, smooth, and primed before hanging wallpaper for the best adhesion and finish.

By using this calculator and following these tips, you'll be well on your way to a beautifully wallpapered room with minimal hassle and waste.