Wallpaper Calculator
This calculator counts strips rather than square metres, which is how wallpaper actually goes on the wall.
Why counting by area is wrong
A 0.53 × 10.05 m roll is 5.3 m². Divide the wall area by 5.3 and you will be short: with a 2.7 m ceiling one roll gives only 3 strips, and the remaining 1.95 m is waste. The correct approach: strips = perimeter ÷ roll width, strips per roll = roll length ÷ (height + 5 cm).
Worked example
A 3 × 4 m room with a 2.7 m ceiling has a 14 m perimeter. At 0.53 m wide you need 27 strips. Each strip with trim is 2.75 m, so a roll yields 3 strips. 27 ÷ 3 = 9 rolls.
Pattern repeat: why patterned paper needs more rolls
The repeat is the distance after which the pattern starts again. To align neighbouring strips you trim each one, and consumption rises. With a 64 cm repeat the same roll often yields 2 strips instead of 3. The repeat is printed on the label next to the match symbol.
Details worth checking
- Areas above doors and under windows still need pieces, so do not plan those strips down to zero.
- Walls in older buildings are rarely the same height. Measure in three places and use the largest value.
- Buy rolls from one batch: the batch number is printed next to the article number.
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