The most common mistake when ordering wallpaper is miscalculating the yardage. You’ll need to know your wall dimensions and the wallpaper’s pattern repeat to get it right. Too little, and you’ll face frustrating seams with no matching pattern. Too much, and you’re wasting money.
Understanding wallpaper roll sizes
Wallpaper isn’t sold by the yard in the same way fabric is. It typically comes in rolls with specific pre-determined lengths and widths. In the US, a standard double roll is often around 20.5 inches wide and 33 feet long. However, this can vary. Always check the manufacturer’s specifications for the exact dimensions of the roll you are purchasing.
This is crucial because the usable width of the wallpaper after trimming off the selvages (the factory-trimmed edges) might be slightly less than the stated width. For calculations, use the stated width. The length is what you’ll divide into to get your yardage.
How to measure your walls for wallpaper
You need two primary measurements: the total width of all walls to be wallpapered and the height of the walls. Measure each wall separately and add them together for the total width. Use a metal tape measure for accuracy. Measure from the ceiling line to the baseboard.
Wall width: Add up the width of each wall you intend to cover. For example, if you have two walls that are 10 feet wide and two that are 12 feet wide, your total width is 10 + 10 + 12 + 12 = 44 feet.
Wall height: Measure the height of the wall from the ceiling to the baseboard. For consistency, try to measure the height in a few different spots, especially if your ceiling or floor isn’t perfectly level. Use the longest measurement. Let’s say your walls are 8 feet high.
Calculate total square footage (optional but helpful): Multiply total wall width by wall height. In our example: 44 feet (width) x 8 feet (height) = 352 square feet. This gives you a general idea, but isn’t precise enough for ordering.
Accounting for pattern repeat
This is where most DIYers get tripped up. The pattern repeat is the vertical distance on the wallpaper where the design begins to repeat. It’s usually stated on the wallpaper’s packaging or product description, often in inches. Common pattern repeats range from 0 to 24 inches.
Why it matters: When you hang a strip of wallpaper, you cut another strip to match the pattern. If you have a large pattern repeat, you’ll need more wallpaper to achieve this match. You will lose a significant portion of the wallpaper roll to achieve the pattern match, especially with large or complex designs.
How to calculate for pattern repeat:
- Take your wall height and add the pattern repeat to it. This is the length you need for each strip of wallpaper. For example, if your wall height is 8 feet (96 inches) and the pattern repeat is 18 inches, each strip needs to be 96 + 18 = 114 inches long.
- Determine how many full strips you can get from one roll of wallpaper. A standard US double roll is about 33 feet (396 inches) long. Divide the roll length by your required strip length: 396 inches / 114 inches per strip = approximately 3.5 strips. You can only get 3 full strips from this roll.
Calculating total wallpaper needed in yards
Now, let’s put it all together to find the yardage. Most wallpaper is sold in rolls that, when converted, yield a certain number of linear yards. It’s often easier to calculate the number of rolls needed first.
1. Calculate the number of strips needed:
- Divide your total wall width by the usable width of the wallpaper. If your total wall width is 44 feet (528 inches) and the wallpaper is 20.5 inches wide, you need 528 inches / 20.5 inches per strip = approximately 25.75 strips. You’ll need 26 strips.
2. Calculate the number of rolls required:
- Divide the total number of strips needed by the number of strips you can get from one roll. In our example, you need 26 strips, and you get 3 strips per roll. So, 26 strips / 3 strips per roll = 8.67 rolls. You must round up to the nearest whole number, meaning you need 9 rolls.
3. Convert rolls to linear yards (the final step for wallpaper calculator yards):
- This is where it gets a bit tricky as roll sizes vary. A common US double roll is roughly 33 feet long. Since 1 yard = 3 feet, a 33-foot roll is 11 linear yards.
- Multiply the number of rolls you need by the linear yards per roll. For our example: 9 rolls x 11 yards per roll = 99 linear yards.
Important Considerations:
- Doors and Windows: These calculations assume solid walls. You can often get away with fewer strips or use the cut-off pieces from pattern matching around windows and doors. However, it’s safer to calculate for full coverage and use the extras for repairs or smaller accent areas.
- Waste: Always order at least one extra roll. This accounts for mistakes during installation, future repairs, or if you miscalculated. It’s much better to have a bit left over than to run out mid-project.
- Pattern Scale: Very large or very small patterns might require slightly different considerations. Always refer to the specific wallpaper’s instructions.
- Directionality: Most wallpapers should be hung vertically. Some intricate patterns might have a specific up or down. Ensure you hang all strips in the same orientation.
Using a wallpaper calculator
If all this math seems daunting, many manufacturers and retailers offer online wallpaper calculators. You input your wall dimensions, ceiling height, and sometimes the pattern repeat, and it gives you an estimate in rolls or yards. While these are helpful, understanding the manual calculation process helps you verify their results and catch potential errors.
Remember that these calculators often provide estimates. It’s always best practice to add an extra 10-15% for waste and potential mistakes, or at least one extra roll.
Common mistakes to avoid
1. Forgetting pattern repeat: This is the biggest error. If you have a 20-inch pattern repeat on 8-foot walls, you’re essentially losing almost two feet of wallpaper for every strip to match the pattern. Always factor this in.
2. Not measuring accurately: Use a reliable tape measure and double-check your numbers. Measure twice, order once.
3. Assuming all rolls are the same size: Roll sizes vary significantly by manufacturer and wallpaper type (e.g., mural panels, grasscloth). Always check the specific dimensions.
4. Not ordering enough for future repairs: Wallpaper styles go out of production. Having an extra roll or two from the same dye lot (batch number) is invaluable for patching damage later. Dye lots can affect the color, so new rolls might not match older ones.
5. Ignoring installer recommendations: If you hire a professional, they often have their own methods and experience that might differ slightly. Trust their expertise, as they deal with this daily. However, understanding the basics yourself ensures you can discuss the order intelligently. For more on professional costs, check out our Wallpaper Installation Cost Calculator.
When to use different wallpaper types
The calculation method remains largely the same, but the amount of waste can differ:
- Solid vinyl wallpaper: Durable and scrubbable, often with a lower pattern repeat, leading to less waste.
- Textured wallpaper (e.g., embossed): Can hide minor wall imperfections but might require more careful pattern matching.
- Grasscloth and natural fibers: These often have more natural variations and may not have a strict pattern repeat. You might need more for overall consistency and to account for natural flaws. Ordering an extra roll is highly recommended. For inspiration with beautiful natural designs, explore options like Yellowstone wallpaper or floral wallpaper.
- Murals and large-scale prints: These are often custom-sized or come in panels. You’ll need to calculate based on the specific product’s instructions, which might be different from standard rolls. Consider brands like Rifle Paper Co. wallpaper for unique, large-scale artistic designs.
Mastering the wallpaper calculator yards is a skill that saves you time, money, and stress. By carefully measuring, understanding pattern repeats, and always adding a buffer for waste, you ensure your wallpaper project looks professional and is completed without a hitch.