Is this wallpaper calculator 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.

Why does the calculator add 10% extra?

Wallpaper installation always produces waste from cutting strips to length and matching patterns. 10% is the standard buffer; add another roll when working with large repeating patterns or diagonal cuts.

What is the standard wallpaper roll size?

US double rolls are typically 21 inches wide and 33 feet long (covers ~56 sqft). European rolls are usually 20.5 in × 33 ft. Always check the label for exact dimensions.

Wallpaper Calculator

Find out how many rolls of wallpaper you need based on room dimensions and pattern repeat.

100% client-side · no upload

Room perimeter (ft) Wall height (ft) Doors & windows (count) Roll width (in) Roll length (ft) Pattern repeat (in (0 = none))

How to use

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 how many rolls to buy.

Related tools

More ways to use this tool

Frequently Asked Questions

Is this wallpaper calculator 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.
Why does the calculator add 10% extra?: Wallpaper installation always produces waste from cutting strips to length and matching patterns. 10% is the standard buffer; add another roll when working with large repeating patterns or diagonal cuts.
What is the standard wallpaper roll size?: US double rolls are typically 21 inches wide and 33 feet long (covers ~56 sqft). European rolls are usually 20.5 in × 33 ft. Always check the label for exact dimensions.

Last updated: 2026-05-20 By jarvisbox