Wallpaper rolls for a room — wall area, pattern repeat and rolls to order.
Multiply the room perimeter (all four walls) by the wall height to get the wall area, then divide by the roll coverage. A standard 10m roll covers about 5.2 m². Large pattern repeats waste more paper, so round up generously.
A 4m × 4m room (12m perimeter, 2.4m walls) needs about 6 rolls of standard wallpaper.
Yes, but subtract conservatively — you still need full drops either side of openings.
A pattern repeat is the vertical distance before the design repeats. Matching it across drops wastes paper, so larger repeats need more rolls.