Yes, completely free with no signup required.

Does my data leave my device?

No. All calculations happen in your browser — nothing is sent to a server.

Does it work on mobile?

Yes. The tool is mobile-first and works on any modern browser.

部屋の寸法とパターンリピートをもとに必要な壁紙のロール数を算出。

Room dimensions

Perimeter (ft) Wall height (ft) Doors & windows

Roll specifications

Roll width (in) Roll length (ft) Pattern repeat (in)

Enter the total room perimeter (sum of all wall lengths) and ceiling height in feet.
Enter the roll width and length from the wallpaper label, and the pattern repeat if applicable.
The calculator adds a 10% waste buffer and shows the number of rolls to buy.

Is this tool free?: Yes, completely free with no signup required.
Does my data leave my device?: No. All calculations happen in your browser — nothing is sent to a server.
Does it work on mobile?: Yes. The tool is mobile-first and works on any modern browser.

Last updated: 2026-05-20 By jarvisbox