The amount of wallpaper rolls required depends not only on the total area of the wall or ceiling and the perimeter of the room, but also on the roll length and roll width. You can find the dimensions applicable to your desired item as well as a roll calculator in the detailed view.
Calculate room perimeter
Measure out each wall in your room that is to be wallpapered and add the areas together. This gives you the perimeter of the room. Multiply by the height of the room to get the area to be wallpapered. We recommend adding an extra 5 cm.