About the Wallpaper Calculator
Wallpaper goes up in vertical strips (drops). Each drop is the wall height plus about 10 cm (4 in) for trimming, plus the pattern repeat so the design lines up.
Divide the roll length by the drop length to get drops per roll, and the wall length by the roll width to get the number of drops. Standard European rolls are 53 cm × 10.05 m.
