Wallpaper Roll Calculator
Get an accurate roll count using the strip-based method installers use — no guessing, no leftover partial rolls in a dye lot you can’t match later.
Rolls needed
The strip method, explained
Wallpaper isn’t sold by the square foot the way paint is, because a roll can only be cut into whole vertical strips — any leftover length at the bottom of a roll is waste. The reliable way to size a job is to work out how many strips fit on one roll (roll length divided by strip length), how many strips the wall needs (wall width divided by roll width), and then how many rolls that many strips requires.
Measure your wall width and height precisely, note the roll dimensions and pattern repeat from the label, and let the tool handle the rounding. Doors and windows are usually left out of the width measurement unless the strip run is genuinely interrupted — most installers paper straight across an opening and trim afterward, since seams are the visible weak point, not the small offcut.
Frequently Asked Questions
How is a wallpaper strip different from a roll?
A roll is the packaged product you buy; a strip is one vertical piece cut from that roll to the height of your wall (plus a pattern-matching allowance) and hung edge to edge. One roll usually yields several strips, which is why the calculator works out strips per roll before it works out rolls.
What is a pattern repeat, and why does it add extra length?
Many wallpapers have a repeating motif that must line up from strip to strip. To keep the pattern matching at every seam, each strip is cut a little longer than the wall height so the motif on the next strip can be aligned — the size of that extra allowance is the pattern repeat, printed on the roll's label. A larger repeat means fewer strips per roll and more rolls overall.
Should I round up or buy exact rolls?
Always round up to a whole roll — partial rolls aren't sold, and this calculator's roll total already does that rounding for you. It's also wise to buy at least one extra roll from the same dye lot in case of an install mistake or a future repair, since later batches can vary slightly in color.
What if my wall height is taller than a full roll?
Very tall walls (a stairwell or a double-height great room) can exceed a standard roll's length once the pattern repeat is added. In that case, professional installers either "railroad" horizontal-pattern papers (running the roll sideways) or piece two shorter lengths together at a disguised seam — the calculator flags this case so you know to plan around it.
Educational estimate only. Always confirm the roll width, length, and pattern repeat printed on your specific product's label — these vary by manufacturer and country.