Most wallpaper rolls are about half a metre wide and 10 metres long – about 5 square metres per roll. That is about 3 drops of wallpaper on a standard sized wall. As a guide, a standard living room would require approximately 7 rolls of wallpaper. However, there are a few things like matching and pattern repeats to be considered. We recommend that you purchase an additional roll of wallpaper. This will allow for any mistakes, and also give you some left over in case you need it in the future.