Walls - measuring up for paperhanging

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These measurements are based on standard rolls: i.e. 33ft x 21" or 10m x 530mm
Wallpapers	Distance around the room - including the doors and windows.
Total feet around the room	33	39	46	52	59	66	72
Total metres around the room	10	12	14	16	18	20	22
7ft or 2.1m wall height	5	5	6	7	8	9	10
7ft6" or 2.3m wall height	5	6	7	8	9	10	10
8ft or 2.4m wall height	5	6	7	9	10	11	12
8ft6" or 2.6m wall height	5	6	7	9	10	11	12
9ft or 2.7m wall height	6	7	8	9	10	12	12

The amount of paper needed changes according to the size of the matching pattern. The chart above assumes wallpaper without a matching pattern.
For instance, on a 7ft 6" wall, using a wallpaper with no pattern or a very small repeat pattern you will get four pieces from one roll but using a wallpaper with a large (24") repeat pattern you will only get three pieces from a roll. That means for a large pattern you will need an extra roll for every three of unpatterned.