How to: Calculate the Required Amount of Wallpaper

First, you have to take into account what your wallpaper pattern is.
This is because a wallpaper with a pattern has to be matched side by side with the next repeating pattern to ensure there is no loss of symmetry in the wallpaper design. However, for plain wallpaper designs, this is less of a concern as they are uniform in their design and has little to no pattern to be matched.

Many of the patterned wallpapers have repeated patterns.
Therefore, the more intricate the pattern, the more precise the matching has to be and we have to account for more wallpaper wastage.

For plain wallpaper

First, measure the “width” and “height” of the wall.

To calculate the required amount of wallpaper, start by measuring the dimensions of the wall or area you wish to install the wallpaper on. Measure the width of the floor as well as the height of the base of the wall to the ceiling.

Calculation method of required amount

For example, calculate the required amount when placing a 92cm(W) by 1M(H)  wallpaper on a wall that is 330cm wide x 240cm high.

First, divide the width of the wall by the width of the wallpaper.

Wall width  330cm ÷ Wallpaper width  92cm = 3.5 = Rounding up the decimal point = 4

Required rolls for the width is 4

Calculate the length required for one width

Add 5-10cm to the ceiling height.
Wall height 240cm + Excess 10cm = 250cm

The required length is 250cm or 2.5M

Calculate the required number of wallpaper m

Calculate the required number of wallpaper m with the “required width” x “required length” calculated above.
Length 2.5M x 4 width =  10M

To install plain wallpaper on the wall this time, about 10M of wallpaper is required.

There will be wastage, so its best to get 10% more excess to account for the wastage.

In conclusion, the required amount of wallpaper for the 330CM X 240CM wall is
0.92M(W) X 11M(H) of Wallpaper.

For Pattern Wallpapers

First, measure the wall size.

The first few parts will be the same, calculate the wall size using the same way to calculate wall size for plain wallpaper.
To calculate the required amount of wallpaper, start by measuring the dimensions of the wall or area you wish to install the wallpaper on. Measure the width of the floor as well as the height of the base of the wall to the ceiling.

How to calculate the required number

Calculate the required number of m of wallpaper to put on the wall of width 330cm x height 240cm.
For example, we will use a patterned wallpaper (with a width of 92 cm and a vertical pattern repeat of 64.2 cm.

*Vertical pattern repeat is different from the height or width, the repeat signifies the length at which the pattern will be repeated

Calculate the required number of widths by dividing the width of the wall by the width of the wallpaper.

Wall width 330cm  ÷ Wallpaper width 92cm  = 3.5cm = Rounding up the decimal point =  4
Required width is 4M

Calculate the length required for one width

(Ceiling height 240cm ) ÷ (Vertical repeat 64.2cm ) = 3.73 … ⇒ Pattern repeat 4 rotations per width by raising the decimal point
(pattern repeat 64.2cm ) x ( 4 rotations ) = 256.8cm
this case, the length required for 1 width Will be about 260cm .
* Since the first width is pasted first, the ceiling height + 10cm margin is sufficient regardless of the repeat.

Calculate the required number of wallpaper

Calculate the required number of wallpaper m with the “required width” x “required length” calculated above.
Length 260Cm  ×  4 width  = 1040cm
For patterned wallpaper, the wastage is often more, in this case, we will tend to put a 20% excess.
1040CM x 1.2 = 1248.
Total patterned wallpaper required for a 330CM X 240CM wall will be
12.48M.|

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