Wallpaper Calculator

Calculate wallpaper needed for a wall. Estimate rolls, strips, and account for pattern repeats.

This calculator figures out how many wallpaper strips fit vertically in one roll, how many strips your wall needs horizontally, and then how many full rolls that requires. Strips Per Roll is simply Roll Length divided by Wall Height, so Wall Height and Roll Length are two symmetric levers pulling in opposite directions on that same ratio: at the default dimensions, a proportional increase in Wall Height and an equal proportional decrease in Roll Length shrink Strips Per Roll by the same amount, and either one on its own can knock the roll one full strip shorter, forcing an extra roll purchase -- a longer roll saves a roll purchase just as reliably as a shorter wall does. Pattern Repeat has a real effect too, since it shortens the usable roll length before strips are cut from it; raising it from 0 to 24 inches at the default dimensions is enough to push Rolls Needed up by one on its own. Wall Width and Roll Width also feed into how many strips the job needs, but at these particular dimensions both stay within the same "number of rolls" bracket across a normal range of adjustment, because rolls are only bought in whole numbers and the strip counts happen to round to the same roll total either way -- that can flip for a wider wall or a narrower roll, so don't assume either input is truly irrelevant. Wall Area, by contrast, scales cleanly and proportionally with both Wall Height and Wall Width, since it's simply their product. This estimate does not add extra material for cutting mistakes beyond the stated pattern repeat allowance, so buying one extra roll as a buffer is common practice, especially with a pattern repeat.