LayoutWise

Wallpaper Calculator

Enter the room and the pattern repeat from the label. You get the strips to hang, how many each roll gives you, and the rolls to buy.

Your room

1. Room
Length
ft
in
Width
ft
in
Wall height
ft
in
2. Paper

Rolls

9

Standard double roll

Strips

23

112" each

Per roll

3

usable strips

Wall area

304 sq ft

to cover

Cutting one roll

3 strips of 112"
Green is the wall height, clay the pattern-matching loss, grey the leftover

Shopping list

  • ✓Wallpaper: 9 rolls of standard double roll (20.5" x 33 ft) (incl. one spare from the same batch)
  • ✓Wallpaper primer for the walls (one gallon covers roughly 300–400 sq ft)
  • ✓Paste if the paper is unpasted, a smoothing brush, seam roller and a sharp blade

Buy every roll from the same batch (dye lot) — colors vary between batches. A spare roll covers repairs later.

Count strips, not square feet

Dividing wall area by roll coverage underestimates wallpaper, because you hang full-height strips and lose the leftover at the end of every roll. Count strips instead: the room's perimeter divided by the roll width gives the strips to hang. Then each roll gives you its length divided by (wall height + pattern repeat + about 4" for trimming), rounded down.

Example: a 12' x 10' room with 8-foot walls, one door and two windows, using standard 20.5" x 33 ft double rolls with a 12" repeat. Each strip is cut 112" long, so a roll gives 3 strips. The room needs 23 strips — 8 rolls, plus a spare from the same batch.

Pattern repeat

The repeat is the distance before the pattern starts again, printed on the label. Each strip has to start at the same point in the pattern, so you lose up to one repeat per strip. Random-match papers have no repeat to line up and waste least.

Buy from one batch

Wallpaper is printed in batches (dye lots), and colors vary slightly between them. Buy every roll — and a spare — with the same batch number.

Painting the other walls? Use the paint calculator.