Use the following formula (width of the wall + repeat) x height wall = X m2
Except for the roll dimensions you also need the size of the repeat of the pattern.
The "repeat" indicates the length or the interval after which the wallpaper pattern repeats.
This interval must be respected and individual wallpaper strips fitted together for seamless continuation of the pattern.
Calculation still continues – dividing the surface area of the wall (X) by the surface of the wallpaper roll:
X ÷ 5 = Y
Round up Y to whole number and you have the required number of rolls.