Wallpaper Calculator
How many rolls of wallpaper for a room? Enter the wall length and height, the roll size and the pattern repeat — a big repeat wastes more paper — and get the roll count in strips.
Add up all the walls you are papering.
Printed on the roll. 0 for plain or random-match paper; 12–24 in for most patterns. A big repeat wastes more paper.
Enter a positive wall length (up to 2,000 ft) and height (up to 30 ft), and a pattern repeat up to 48 in.
Formula used: Strips needed = net wall length ÷ roll width. Strips per roll = roll length ÷ (wall height + pattern repeat + 4 in trim). Rolls = strips needed ÷ strips per roll, rounded up.
How this estimate works: Wallpaper is counted in strips, not square feet: the net wall length is divided by the roll width to get the number of strips, and each strip must be cut long enough to match the pattern at the ceiling — that is why the pattern repeat is added to the wall height. A large repeat means fewer strips per roll, which is why patterned paper always needs more rolls than plain.
How the wallpaper calculator works
Wallpaper is counted in strips, not square feet: the net wall length is divided by the roll width to get the number of strips, and each strip must be cut long enough to match the pattern at the ceiling — that is why the pattern repeat is added to the wall height. A large repeat means fewer strips per roll, which is why patterned paper always needs more rolls than plain. Buy one extra roll beyond the count if the dye lot matters: a later batch can be a visibly different shade.
Try next: Tile Calculator · Flooring Calculator · Laminate Flooring Calculator
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