Calculate how many rolls of wallpaper you need to cover your walls, accounting for roll coverage and a waste allowance for pattern matching and trimming.
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This calculator multiplies your total wall length (or room perimeter) by wall height to get total area, adds a waste allowance, then divides by the usable coverage of a single roll: Rolls Needed = (Wall Area × (1 + Waste%)) ÷ Roll Coverage. A standard single roll is commonly cited as offering about 56 square feet of usable coverage, though this varies by brand and roll width.
Wallpaper typically needs a higher waste allowance than paint, commonly 15% or more, because patterns need to be matched at the seams between strips, which means cutting off and discarding a portion of each strip depending on the pattern's repeat length. Large, complex pattern repeats generally need an even higher waste allowance than simple or non-repeating patterns.
It's the actual area you can apply to a wall, after accounting for the roll's total area, this is typically somewhat less than the roll's total square footage due to trimming and pattern matching, which is why this calculator lets you adjust the coverage figure directly if your specific wallpaper's packaging states a different usable coverage.
Many installers recommend buying one extra roll beyond the calculated amount, especially for large or bold pattern repeats, since dye lots can vary between production runs and it can be hard to get an exact match later if you run short.
No, this calculator is designed for full-wall rolls. Borders are sold and measured differently, typically by linear footage rather than roll coverage.
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