Wallpaper calculator: how many rolls
Wall width and height, the size of the roll and the pattern repeat give the number of rolls and how many drops one roll yields.
Your figures
Result
The figures changed. Press “Calculate again” to see the new result.
Building material catalogue — 1 material in the catalogue
How we calculate it
What you enter
- Width (m)
- Height (m)
- Roll width (m)
- Roll length (m)
- Pattern repeat (m, 0 = none)
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.
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 ⌉The site's engine is a 1:1 port of the Android app's code.
Frequently asked questions
How many rolls of wallpaper for a room?
Wall width divided by roll width gives the number of drops; roll length divided by drop height gives the drops per roll. The calculator does both and rounds up.
How does the pattern repeat change the count?
With a patterned paper every drop is stretched to a whole multiple of the repeat, so one roll yields fewer drops. A repeat of 0 means there is no pattern to match.
The same formula in the app LiczMat for Android uses the same engine offline — with the material catalogue and results saved into a project. Download