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As a general rule a standard roll of
wallpaper measures 0.53m wide and 10.05m
long.
Here is how to calculate the number of rolls
you need:
1. First, you need to calculate the
perimeter of the room to be papered, not
including the openings (doors and windows).
You also need to work
out the height of the wall and factor in an extra 10cm to
trim every strip.
2. Once you have calculated the perimeter,
you can work out the number of strips you
need. To do this, divide the perimeter by
the width of a
strip (0.53m). Only count in whole numbers. Round up to the
next whole number if there is a decimal
remaining.
3. Next, take the length of the rolls (10
meters) and divide by the height (don’t
forget to add 10cm). Finally, to calculate
the number of rolls of
wallpaper you need, take the number of strips and divide by
the number of strips in a roll.
Wallpaper without matches
1. Calculating the perimeter
P = Perimeter
P = (A + B) x 2 – (Width of doors and
windows)
2. Calculating the number of rolls needed
P/0.53 = x: No. of strips needed
3. Number of rolls needed
10.05/h (height) = y: no. of strips in a
roll
x/y = No. of rolls needed
For example:
for a room with two 3.50m walls and two
4.10m walls, a height of 2.95m, a 0.80m door
and a 1.25m window.
Perimeter measurement: (3.50+4.10) x 2 =
15.20 meters
Deduct the openings: 15.20m – (0.80+1.25) =
13.15 meters
Number of strips needed: 13.15m divided by
0.53 = 25 strips
Height of every strip of wallpaper: 2.95m +
0.10m = 3.05 meters
Number of strips in a roll: 10 divided by
3.05 = 3
Number of rolls needed: 25/3 = 8.33 rounded
up to 9 rolls.
If there are any alcoves, add 1 to 2 extra
rolls.
Calculating the number of rolls when the
wallpaper has a straight match or a drop
match:
Paper with a straight match P = (A + B) x 2
p/0.53 = x: no. of strips needed
10.05/ (h + match) = y: No. of possible
strips in a roll
So x/y = no. of rolls needed
Paper with a drop match P = (A + B) x 2
P/0.53 = x: no. of strips needed
10.05/ (h + match) = y: No. of possible
strips in a roll
2
So x/y = no. of rolls needed
Modern wallpapers are 10.05m long, 53cm wide
and have a 53cm match (the pattern repeats
every 53cm).
Simply imagine that you’re hanging 53cm x
53cm tiles!
In this case you should count the number of
tiles you will need to use using the
following calculations:
Anything cut from a tile will not be used.
In a 10.05m roll, there are 18 whole 53cm
tiles.
For a 2.50m high wall, you need 2.5/0.53 =
4.7 tiles (5 tiles).
A 10.05m roll therefore contains 18/5 = 3.6
strips (or only 3 if you are not matching
horizontally).
No horizontal match
With horizontal match
For example:
Take a room with a perimeter of 15m which we
want to hang with wallpaper, matching
horizontally:
The number of strips is 15m/0.53m (width of
a strip) = 29 strips.
The number of tiles is 29 (strips) x 5
(tiles per strip) = 145 tiles
As there are 18 tiles per roll, we need
145/18 rolls, rounded up to the next whole
number = 9 rolls. |
