Wallpaper Calculator — How Many Rolls Do You Need?

First find wall perimeter and height to get total wall area, then divide by usable area per roll (roll length × width, minus waste for pattern matching). A standard roll is 10m × 0.53m = 5.3m², but pattern repeat and trimming typically reduce usable coverage to 4-4.5m² per roll.

Pattern repeat is the vertical distance before a wallpaper design repeats itself. Wallpapers with a large repeat (30cm+) waste more material because each strip must be cut to align the pattern with the previous strip, increasing the number of rolls needed by 10-25% compared to a plain/no-repeat wallpaper.

The most common international standard is 10m length × 0.53m width (5.3m² per roll), though American rolls are often 10.05m × 0.686m. Always check your specific product's dimensions, as sizes vary by brand and country of origin.