A room with a 14 m perimeter and 2.5 m walls takes 7 standard rolls of plain wallpaper, or 9 rolls with a 53 cm pattern repeat.
| Room perimeter (m) | 2.4 m walls | 2.5 m walls | 2.7 m walls | 3.0 m walls |
|---|---|---|---|---|
| 8 | 4 | 4 | 6 | 6 |
| 10 | 5 | 5 | 7 | 7 |
| 12 | 6 | 6 | 8 | 8 |
| 14 | 7 | 7 | 9 | 9 |
| 16 | 8 | 8 | 11 | 11 |
| 18 | 9 | 9 | 12 | 12 |
| 20 | 10 | 10 | 13 | 13 |
| 22 | 11 | 11 | 14 | 14 |
| 24 | 12 | 12 | 16 | 16 |
| 26 | 13 | 13 | 17 | 17 |
How it is computed
Strips = perimeter ÷ 0.53 m, rounded up; strip length = wall height + pattern repeat; strips per roll = 10.05 m ÷ strip length, rounded down; rolls = strips ÷ strips per roll, rounded up. Doors and windows are not subtracted: their offcuts rarely fit elsewhere.
FAQ
What is a pattern repeat?+
The vertical distance before the design repeats. Each strip must be shifted to match, which wastes up to one repeat per strip; it is printed on the roll label.
Should I buy an extra roll?+
Yes, one from the same batch number. A roll bought later may come from a batch with a slightly different shade.