How Does It Work?
- Measure the roomLength and width for a whole room, or switch to a single wall for a feature wall. The perimeter is what matters, not the floor area.
- Enter the pattern repeatPrinted on the roll label. Zero for a plain paper. This is the number that decides how much you waste, because every drop must start at the same point in the pattern.
- Read the rollsThe calculator shows how many drops the room needs, how many drops each roll yields, and therefore how many rolls to buy.
What Is It Used For?
Wallpaper is not sold by area, so a figure in square metres is no help at the till. It is hung in vertical drops the width of the roll, and each drop has to be cut to the same length. With a patterned paper every drop must begin at the same point in the design, so the cut length rounds up to a whole number of pattern repeats — a 64 cm repeat on a 2.4 m wall means cutting 2.56 m and discarding the rest. That is why a large repeat can cost you a whole extra roll on the same room.
- Ordering wallpaper for a bedroom, living room or hallway.
- Working out a single feature wall without paying for a whole room.
- Comparing a plain paper against a large-repeat pattern before choosing.
- Checking a decorator’s estimate before agreeing to it.
- Deciding how many spare rolls to keep from the same batch.
Examples
| Room | Height | Repeat | Rolls |
|---|---|---|---|
| 4 × 4 m (16 m perimeter) | 2.4 m | None | 8 |
| 4 × 4 m (16 m perimeter) | 2.4 m | 64 cm | 11 |
| 3 × 4 m (14 m perimeter) | 2.4 m | None | 7 |
| 4 m feature wall | 2.4 m | None | 2 |