Rolls of wallpaper for a room, allowing for pattern matching.
AdvertisementA 12x10 ft room with 8 ft walls, one door and one window needs 7 double rolls of wallpaper with no pattern repeat.
We take the wall area, subtract 21 sq ft per door and 15 sq ft per window, add extra for trimming and pattern matching (10% to 25%), and divide by the coverage of one roll. A US double roll covers about 56 sq ft; check the label on yours.
In the US, wallpaper is priced by the single roll but sold in double rolls. A double roll is usually about 56 sq ft, of which roughly 45 to 50 sq ft is usable after trimming.
Add about 15% for a small repeat (under 6 in) and 25% for a large repeat, because each strip has to line up with the one beside it.
With 8 ft walls, one door and one window, about 7 double rolls of 56 sq ft with no pattern repeat. A large repeat raises that to 8.
Yes. One spare roll covers mistakes and future repairs, and rolls from a later batch may not match the color exactly.