How do I work out how much paper I need in a room?

Most wallpaper rolls are about half a metre wide and 10 metres long, so that will give you about 3 drops given the standard wall height of 2.4 metres—about 5 square metres per roll. A normal-sized living room would take around 7 rolls, generally speaking but of course there are things like pattern repeats to be considered.

As a starting point see our roll reckoner, and double-check with your retailer when you order.