Wallpaper Calculator

Find how many rolls of wallpaper a room needs, allowing for pattern repeat and trimming.

Units	Imperial (ft, in)
Total width of walls to paper	46 ft
Wall height	8 ft
Roll width	20.5 in
Roll length	33 ft
Pattern repeat	0 in
Full-height doors or windows (strips saved)	0

Units

Total width of walls to paper

Add up the widths of all walls.

Wall height

Roll width

Roll length

Pattern repeat

0 for plain paper.

Full-height doors or windows (strips saved)

Rolls needed

27 strips of 8.33 ft; each roll gives 3 strips. Buy all rolls from the same batch number.

Strips: 27
Strips per roll: 3

Each roll cut into full-height strips

Roll 1

Roll 2

Roll 3

Roll 4

Roll 5

Roll 6

Roll 7

Roll 8

Roll 9

About the Wallpaper Calculator

Enter the total width of the walls you're papering, the wall height, the roll's width and length, the pattern repeat and how many full-height doors or windows there are. The calculator gives the number of rolls, strips and strips per roll.

Wallpaper is hung in vertical strips. With a pattern repeat each strip must be rounded up to whole repeats so the pattern matches, and 10 cm is added for trimming. A standard European roll is 10.05 m × 0.53 m.

The formula

Rolls = ⌈strips ÷ ⌊roll length ÷ strip length⌋⌉

Worked example

14 m of wall, 2.4 m high, standard 10.05 × 0.53 m rolls, plain paper, one full-height door

Strips: 14 ÷ 0.53 = 26.4 → 27, minus 1 for the door = 26
Each strip 2.5 m with trimming, so 4 strips per roll
26 ÷ 4 = 6.5 → 7 rolls

Questions people ask

Should I subtract windows?

Only full-height openings save whole strips; small windows still use offcuts.

How much extra?

Buy at least one spare roll for mistakes and repairs.

Why does pattern repeat matter?

A 64 cm repeat on a 2.4 m wall means each strip uses 2.56 m, so fewer strips fit on a roll.