DIY Calculators

Wallpaper calculator

Work out how many rolls of wallpaper you need for a room, with the pattern repeat.

Uses only the sizes you enter.

Add the walls together. Leave doors and windows in: you will cut round them.

Both are on the roll's label. Ours are only examples.

On the label too. 0 for a plain or random-match paper.
Rolls from different batches can differ in shade, so some people buy one spare.

You need 7 rolls of wallpaper.

rolls

Strips27 strips
Strips from each roll4 strips

Show the workings
StepSumAnswer
Strips across the walls14 m ÷ 0.53 m roll width, rounded up27 strips
Length of each strip2.4 m wall height2.4 m
Strips from one roll10.05 m ÷ 2.4 m, rounded down4 strips
Rolls27 ÷ 4, rounded up7 rolls

Where the figures come from

This sum uses only the numbers you entered.

How many rolls of wallpaper do I need?

Wallpaper is hung in strips, called drops, so the number of rolls depends on how many whole drops you can cut from each roll, not just on the area.

  1. Divide the length of wall by the roll's width to get the number of strips, rounded up.
  2. Each strip is the wall's height, plus the pattern repeat so the pattern lines up.
  3. Divide the roll's length by the strip length, rounded down, to get strips per roll.
  4. Divide the strips by the strips per roll, rounded up.

This counts doors and windows as wall, because you cut round them and the offcuts are rarely long enough to use.

Work out something else