Wallpaper Calculator

Wallpaper is counted in strips, not square feet. Work out how many strips fit around the room, how many full-height strips each roll gives, and divide. A 14 x 12 ft room with 8 ft walls needs 26 strips after doors and windows. Standard 20.5 in x 33 ft rolls give 4 strips each, so you need 7 rolls.

Strips work better than area because every strip is cut from the roll at full wall height. Pieces too short for a full strip are waste. The tool divides the room's perimeter by the roll width to get strips. Then it takes off only the whole strips saved by doors (21 sq ft each) and windows (15 sq ft each). That keeps the estimate on the safe side. Pattern repeat is the height before the design repeats itself. Each strip has to line up with the one beside it, so the tool rounds the strip length up to a whole number of repeats. With a 24 in repeat on an 8 ft wall, strips stay at 8 ft, 4 per roll. With a 21 in repeat, each strip must be 8.75 ft, and only 3 fit on a 33 ft roll. Enter 0 for a plain or random-match paper.

The results show rolls, total and net wall area, strips needed, strips per roll and the strip length used, plus a rough cost at $30 per roll. Check the roll size on the label. Many European rolls are 53 cm x 10.05 m. Buy all rolls with the same batch or lot number, since shades can vary between print runs. For walls you plan to paint, the Paint Calculator uses the same room sizes.