How do I calculate the number of rolls of wallpaper needed?

Most wallpapers are 10.05 m long and 0.53 m wide. This format is the standardized so-called “Euro roll”. If the wallpaper pattern is free match or random match, which means that you can apply the wallpaper strips without offset to the wall, you get 4 strips per roll at a room height of 2.50 m.

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