Wallpaper calculator

Divide the room perimeter by the roll width for the number of strips, then see how many full strips one roll yields at your wall height plus trim. A 4×5 m room at 2.5 m height typically takes 10–12 standard rolls — store charts promise fewer because they cut strips with zero trim allowance.

Each strip must be cut to a multiple of the repeat, so a 64 cm repeat on a 2.5 m wall wastes up to half a repeat per strip — often one strip fewer per roll. Enter the repeat and the calculator rounds each strip length up correctly.

For standard openings decorators usually don't subtract — offcuts above and below rarely reuse. Skip only wide openings like patio doors by entering their total width.