Wallpaper Calculator: How Many Rolls

The pattern repeat is the vertical distance before the design starts over, and it is usually printed on the wallpaper label or product page next to the roll size. The calculator adds it to every strip so neighbouring drops align, which shortens how many strips a roll gives and can raise the roll count.

Each drop on the wall is a full strip cut from the top of the roll to the bottom. The leftover piece at the end of a roll is normally too short to reuse as a full drop, so strips per roll is rounded down and the number of strips to cover the width is rounded up.

Yes. The engine is unit free and only compares numbers, so mixing feet and meters gives a wrong answer. Choose feet or meters in the menu and enter the wall, roll and repeat all in that one unit.

One. The tool sizes a single rectangular wall, which keeps the estimate honest for a feature wall. For a whole room, run each wall separately and add the roll counts, or add the wall widths together if the height is the same.

No. It papers the full rectangle you enter, which is deliberate because you still hang a full strip past most openings and trim the waste. Treating openings as solid wall builds in a small safety margin rather than leaving you short.

A repeat lengthens every strip, so fewer full strips fit on a roll. If that drops strips per roll from four to three, the same number of strips now needs more rolls. Large repeats are the main reason a patterned paper uses noticeably more than a plain one.

Then no full strip fits and the tool shows an amber note that each strip needs its own roll, because strips per roll has fallen below one. That points to a roll that is too short for a tall wall, so look for a longer roll or a paper with a smaller repeat.

It is wise. The result covers the wall exactly with no allowance for a botched cut, a torn drop or a future repair, and reprints can differ in shade between batches. Buying one extra roll from the same batch is cheap insurance.

No. The calculation runs entirely in your browser with plain arithmetic, so nothing you type is uploaded or stored. You can use it offline once the page has loaded.