Wallpaper

How we calculate it

What you enter

• Width (m)
• Height (m)
• Roll width (m)
• Roll length (m)
• Pattern repeat (m, 0 = none)

Formula

strip = Pattern repeat > 0 → ⌈ Height ÷ Pattern repeat ⌉ × Pattern repeat; otherwise Height
strips needed = ⌈ Width ÷ Roll width ⌉
strips per roll = ⌊ Roll length ÷ strip ⌋
rolls = ⌈ strips needed ÷ strips per roll ⌉

Example

The default values from the form, run through the same engine:

What to watch out for

With a pattern repeat every strip is extended to a whole multiple of the repeat, so a roll yields fewer strips. A repeat of 0 means a paper with no pattern to match.

The Materio app for Android uses the same formula. The site's engine is a 1:1 port of the app's code.