Wallpaper Calculator
This wallpaper calculator tells you how many rolls of wallpaper you need to cover a wall so you can order the right amount and avoid a second trip to the shop. Just enter the total width and height of the wall you want to paper, the width and length of the rolls you are buying, and the pattern repeat if the design has one. The calculator instantly returns the number of rolls needed, along with how many strips (drops) you will cut in total and how many of those strips you can get out of a single roll. It works for feature walls and whole rooms, for plain or patterned paper, and for standard European rolls as well as wider or longer specialty rolls.
Rolls needed
Strips needed
Strips per roll
Buy an extra roll to allow for waste, pattern matching and mistakes. A standard roll is about 0.53 m × 10 m.
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How it works
First the calculator works out how many full strips you can cut from one roll: it divides the roll length by the height of each strip and rounds down, because a partial strip is not usable full height. The height of each strip is the wall height plus the pattern repeat, since patterned paper must be trimmed so the design lines up between drops. So strips per roll = floor(roll length ÷ (wall height + pattern repeat)). Next it finds how many strips the wall needs by dividing the wall width by the roll width and rounding up: strips needed = ceil(wall width ÷ roll width). Finally it divides the strips needed by the strips you get per roll and rounds up: rolls = ceil(strips needed ÷ strips per roll). Always round up on both counts and add a spare roll for safety.
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Preguntas frecuentes
- What size is a standard roll of wallpaper?
- A standard European roll is about 0.53 m wide and 10 m long, which covers roughly 5 square metres before waste. American rolls are often 0.68 m wide. Always check the label of your specific paper and enter the real roll width and length into the calculator, because sizes vary by brand and range.
- What is a pattern repeat and why does it matter?
- The pattern repeat is the vertical distance after which the design starts over. With patterned paper each strip must be cut a little longer so the motif lines up with the strip beside it, which wastes some paper. That is why the calculator adds the repeat to the wall height when working out how many strips fit on a roll. Plain paper has a repeat of 0.
- Should I subtract doors and windows?
- For a rough estimate you can enter the full wall width and get a safe number of rolls. If a wall has very large openings you can reduce the width slightly, but it is usually wiser to keep the extra, since you will need offcuts around frames and it is best not to run short mid-job.
- Why should I buy an extra roll?
- An extra roll covers waste from pattern matching, trimming, mistakes and future repairs. It also protects you against batch differences: rolls printed in different batches can vary slightly in colour, so buying enough from the same batch at once avoids a visible mismatch later.
- Does this work for feature walls and whole rooms?
- Yes. For a single feature wall enter that wall's width and height. For a whole room, add up the width of every wall you are papering and enter the total as the wall width, keeping the same height. The calculator then returns the rolls for the entire job.