Wallpaper Yardage Calculator

Wallpaper Yardage Calculator

Required Material

Total Linear Yards

0

Total Linear Feet

0

Number of Strips

0

*Calculations include pattern matching and your specified waste factor.

How to Calculate Wallpaper Yardage Correctlly

Ordering the right amount of wallpaper is critical to ensuring your project looks seamless. Unlike paint, wallpaper requires precise measurements because of the "pattern repeat." If the patterns don't align across different strips, the visual flow of the room is ruined. Our Wallpaper Yardage Calculator takes the guesswork out of the equation by factoring in wall dimensions, roll width, and the vertical repeat of your specific design.

Understanding the Components

  • Wall Dimensions: Measure the width and height of each wall. Do not subtract for small windows or doors unless they take up more than 20% of the wall surface, as you still need full strips to go around them.
  • Pattern Repeat: This is the distance between two identical points in the design. For a "straight match" or "drop match," you must add the repeat length to every strip (except the first) to ensure alignment.
  • Waste Factor: Professional installers usually recommend adding 10% to 15% for cutting, trimming, and accidental errors.

The Calculation Logic

To find the yardage, we use the "Strip Method," which is the industry standard for accuracy:

  1. Determine Strips: Divide the total wall width by the wallpaper roll width and round up to the nearest whole number.
  2. Determine Strip Length: Add the wall height to the pattern repeat length. This ensures each strip starts at the exact same point in the pattern.
  3. Calculate Total Inches: Multiply the number of strips by the modified strip length.
  4. Convert to Yards: Divide the total inches by 36 (since there are 36 inches in a yard) and add the waste percentage.

Example Calculation

Imagine a wall that is 12 feet wide and 8 feet tall. You are using a 20.5-inch wide wallpaper with an 18-inch repeat.

  • Strips: 144 inches (12ft) / 20.5 inches = 7.02 strips. Round up to 8 strips.
  • Height per strip: 96 inches (8ft) + 18 inches (repeat) = 114 inches.
  • Total Inches: 8 strips * 114 inches = 912 inches.
  • Total Yards: 912 / 36 = 25.33 yards. With 10% waste, you need approximately 28 yards.
function calculateWallpaper() { var wallWidthFt = parseFloat(document.getElementById('wallWidth').value); var wallHeightFt = parseFloat(document.getElementById('wallHeight').value); var rollWidthIn = parseFloat(document.getElementById('rollWidth').value); var patternRepeatIn = parseFloat(document.getElementById('patternRepeat').value); var wasteFactor = parseFloat(document.getElementById('wasteFactor').value); if (isNaN(wallWidthFt) || isNaN(wallHeightFt) || isNaN(rollWidthIn) || wallWidthFt <= 0 || wallHeightFt 0) { // More accurate logic for repeat: find how many repeats fit in the wall height and round up var repeatsPerHeight = Math.ceil(wallHeightIn / patternRepeatIn); stripLengthIn = (repeatsPerHeight * patternRepeatIn) + patternRepeatIn; // Adding one extra repeat to the length is the safest pro-installer buffer for matching } else { // No repeat (random match) – just add 2 inches for trimming stripLengthIn = wallHeightIn + 2; } // 3. Total Length in inches var totalInches = numStrips * stripLengthIn; // 4. Apply Waste Factor var totalWithWaste = totalInches * (1 + (wasteFactor / 100)); // 5. Convert to Yards and Feet var totalLinearFeet = totalWithWaste / 12; var totalLinearYards = totalWithWaste / 36; // Display results document.getElementById('totalStrips').innerHTML = numStrips; document.getElementById('totalFeet').innerHTML = totalLinearFeet.toFixed(1); document.getElementById('totalYards').innerHTML = Math.ceil(totalLinearYards); document.getElementById('wallpaperResult').style.display = 'block'; }

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