Planning to redecorate with new wallpaper or wall fabric? Our Wallcovering Calculator helps you accurately estimate how much material you'll need, saving you time and money. Whether you're dealing with intricate patterns or plain designs, this tool accounts for room dimensions, roll sizes, and even pattern repeats to give you a precise estimate.
How to Use the Wallcovering Calculator
Simply enter the dimensions of your room, the specifications of your chosen wallcovering rolls, and any pattern repeat. The calculator will then provide you with the estimated number of rolls required, ensuring you have enough material for your project, including a little extra for trimming and waste.
Understanding Wallcovering Measurements
- Room Length, Width, Height: Measure these in feet to determine the total wall area.
- Number of Doors/Windows: These areas are typically subtracted from the total wall area for general area calculation, though for wallcovering, you often still need to cut around them. The calculator uses standard sizes for a general area reduction.
- Roll Width: Wallcovering rolls come in various widths (e.g., 20.5 inches, 27 inches, 36 inches).
- Roll Length: Standard roll lengths vary (e.g., 16.5 feet, 33 feet).
- Pattern Repeat: If your wallcovering has a pattern, this is the vertical distance before the pattern repeats. This is crucial for matching patterns across strips and often requires extra material.
- Price Per Roll: (Optional) Enter this to get an estimated total cost.
Wallcovering Material Calculator
Calculation Results:
Enter your details and click 'Calculate' to see the results.
Example Calculation
Let's say you have a room that is 12 feet long, 10 feet wide, and 8 feet high. It has one door and one window. You've chosen a wallpaper with a roll width of 20.5 inches, a roll length of 33 feet, and a pattern repeat of 21 inches. Each roll costs $45.
- Room Length: 12 ft
- Room Width: 10 ft
- Room Height: 8 ft
- Number of Doors: 1
- Number of Windows: 1
- Roll Width: 20.5 inches
- Roll Length: 33 feet
- Pattern Repeat: 21 inches
- Price Per Roll: $45
Based on these inputs, the calculator would determine:
- Room Perimeter: 2 * (12 + 10) = 44 feet
- Total Wall Area: 44 * 8 = 352 sq ft
- Standard Door Area: 2.5 ft * 6.67 ft = 16.675 sq ft
- Standard Window Area: 3 ft * 4 ft = 12 sq ft
- Net Wall Area: 352 – 16.675 – 12 = 323.325 sq ft
- Wallcovering Roll Width: 20.5 inches = 1.71 feet
- Pattern Repeat: 21 inches = 1.75 feet
- Number of Drops Needed: ceil(44 ft / 1.71 ft) = 26 drops
- Length Per Drop (with pattern repeat and 6-inch trim):
- Room Height: 8 ft
- Trimming Allowance: 0.5 ft
- Number of Repeats in Drop: ceil(8 ft / 1.75 ft) = 5 repeats
- Length from Repeats: 5 * 1.75 ft = 8.75 ft
- Total Length Per Drop: 8.75 ft + 0.5 ft (trim) = 9.25 ft
- Total Wallcovering Length Required: 26 drops * 9.25 ft/drop = 240.5 feet
- Number of Rolls Needed: ceil(240.5 ft / 33 ft/roll) = 8 rolls
- Estimated Cost: 8 rolls * $45/roll = $360
This example demonstrates how the calculator accounts for all factors to provide a practical estimate.
.calculator-container { background-color: #f9f9f9; border: 1px solid #ddd; padding: 20px; border-radius: 8px; max-width: 600px; margin: 20px auto; font-family: Arial, sans-serif; } .calculator-header { text-align: center; margin-bottom: 20px; color: #333; } .calculator-inputs label { display: block; margin-bottom: 5px; font-weight: bold; color: #555; } .calculator-inputs input[type="number"] { width: calc(100% – 22px); padding: 10px; margin-bottom: 15px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; } .calculator-inputs button { background-color: #007bff; color: white; padding: 12px 20px; border: none; border-radius: 4px; cursor: pointer; font-size: 16px; width: 100%; box-sizing: border-box; } .calculator-inputs button:hover { background-color: #0056b3; } .calculator-results { margin-top: 20px; padding-top: 15px; border-top: 1px solid #eee; } .calculator-results h4 { color: #333; margin-bottom: 10px; } .calculator-results p { background-color: #e9ecef; padding: 10px; border-radius: 4px; border: 1px solid #dee2e6; color: #333; } .calculator-results ul { list-style-type: none; padding: 0; } .calculator-results ul li { background-color: #e9ecef; padding: 8px 10px; margin-bottom: 5px; border-radius: 4px; border: 1px solid #dee2e6; color: #333; } function calculateWallcovering() { // Get input values var roomLengthFt = parseFloat(document.getElementById('roomLength').value); var roomWidthFt = parseFloat(document.getElementById('roomWidth').value); var roomHeightFt = parseFloat(document.getElementById('roomHeight').value); var numDoors = parseInt(document.getElementById('numDoors').value); var numWindows = parseInt(document.getElementById('numWindows').value); var rollWidthIn = parseFloat(document.getElementById('rollWidth').value); var rollLengthFt = parseFloat(document.getElementById('rollLength').value); var patternRepeatIn = parseFloat(document.getElementById('patternRepeat').value); var rollPrice = parseFloat(document.getElementById('rollPrice').value); // Validate inputs if (isNaN(roomLengthFt) || roomLengthFt <= 0 || isNaN(roomWidthFt) || roomWidthFt <= 0 || isNaN(roomHeightFt) || roomHeightFt <= 0 || isNaN(numDoors) || numDoors < 0 || isNaN(numWindows) || numWindows < 0 || isNaN(rollWidthIn) || rollWidthIn <= 0 || isNaN(rollLengthFt) || rollLengthFt <= 0 || isNaN(patternRepeatIn) || patternRepeatIn < 0) { document.getElementById('result').innerHTML = 'Please enter valid positive numbers for all required fields.'; return; } // Constants for standard door/window sizes and trimming allowance var standardDoorWidthFt = 2.5; // 30 inches var standardDoorHeightFt = 6.67; // 80 inches (approx 6'8") var standardWindowWidthFt = 3.0; // 36 inches var standardWindowHeightFt = 4.0; // 48 inches var trimmingAllowanceFt = 0.5; // 6 inches per drop for trimming // Convert inches to feet var rollWidthFt = rollWidthIn / 12; var patternRepeatFt = patternRepeatIn / 12; // 1. Calculate Room Perimeter and Total Wall Area var perimeterFt = 2 * (roomLengthFt + roomWidthFt); var totalWallAreaSqFt = perimeterFt * roomHeightFt; // 2. Calculate Area of Doors and Windows (for general info, not directly used in roll calculation) var doorAreaSqFt = numDoors * standardDoorWidthFt * standardDoorHeightFt; var windowAreaSqFt = numWindows * standardWindowWidthFt * standardWindowHeightFt; var netWallAreaSqFt = totalWallAreaSqFt – doorAreaSqFt – windowAreaSqFt; if (netWallAreaSqFt 0) { // Calculate how many pattern repeats are needed to cover the room height var numRepeatsInDrop = Math.ceil(roomHeightFt / patternRepeatFt); // The actual length cut for the pattern part var patternAlignedLengthFt = numRepeatsInDrop * patternRepeatFt; // Add trimming allowance lengthPerDropFt = patternAlignedLengthFt + trimmingAllowanceFt; } else { // No pattern repeat, just room height plus trimming allowance lengthPerDropFt = roomHeightFt + trimmingAllowanceFt; } // 5. Calculate Total Wallcovering Length Required var totalLengthRequiredFt = numDropsNeeded * lengthPerDropFt; // 6. Calculate Number of Rolls Needed var numRollsNeeded = Math.ceil(totalLengthRequiredFt / rollLengthFt); // 7. Calculate Estimated Cost (if price per roll is provided) var estimatedCost = "; if (!isNaN(rollPrice) && rollPrice >= 0) { estimatedCost = '- ';
resultsHtml += '
- Room Perimeter: ' + perimeterFt.toFixed(2) + ' feet '; resultsHtml += '
- Total Wall Area: ' + totalWallAreaSqFt.toFixed(2) + ' sq ft '; resultsHtml += '
- Net Wall Area (excluding doors/windows): ' + netWallAreaSqFt.toFixed(2) + ' sq ft '; resultsHtml += '
- Wallcovering Roll Width: ' + rollWidthFt.toFixed(2) + ' feet (' + rollWidthIn.toFixed(1) + ' inches) '; resultsHtml += '
- Pattern Repeat: ' + patternRepeatFt.toFixed(2) + ' feet (' + patternRepeatIn.toFixed(1) + ' inches) '; resultsHtml += '
- Number of Drops Needed: ' + numDropsNeeded + ' '; resultsHtml += '
- Length Per Drop (including trim & pattern match): ' + lengthPerDropFt.toFixed(2) + ' feet '; resultsHtml += '
- Total Wallcovering Length Required: ' + totalLengthRequiredFt.toFixed(2) + ' feet '; resultsHtml += '
- Number of Rolls Needed: ' + numRollsNeeded + ' rolls '; resultsHtml += estimatedCost; resultsHtml += '