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Whole wallpaper rolls for any wall.
Enter your wall's length and height plus your wallpaper roll's width and length to see how many whole rolls to buy. The calculator works out how many strips fit across the wall and how many strips each roll yields, then rounds up. Pattern matching needs extra — buy one spare roll for patterned designs.
Wallpaper is sold by the roll, and rolls are smaller than intuition suggests. A standard U.S. single roll (21 inches wide by 16.5 feet long) covers about 35 square feet after trimming and pattern matching; the common 'double roll' (33 feet long) covers about 70. European rolls are typically 10.05 meters by 0.53 meters (about 57 sq ft gross), with usable coverage closer to 50 sq ft once the pattern repeat is accounted for. The pattern repeat — the vertical distance before the design repeats — is the hidden consumer of paper: large repeats force you to cut each strip longer than the wall height to align the pattern, wasting the offcut.
The estimate: total wall area (perimeter x height, minus doors and windows) divided by usable coverage per roll, then padded 15 to 25 percent for pattern matching — use 15 percent for small or random-match patterns, 25 percent for large repeats over 12 inches. Always round up to whole rolls, and buy all rolls from the same batch number: dye lots vary visibly, and a reorder months later will not match.
Measure each wall separately if heights vary (stairwells, sloped ceilings), and do not paper behind large built-ins you will never move. Keep one spare roll after the job — patching a damaged section without matching paper means repapering the whole wall.
Strips = ceil(wall length ÷ roll width); strips per roll = floor(roll length ÷ wall height); rolls = ceil(strips ÷ strips per roll).
Wall area: 12 x 8 = 96 sq ft. Single-roll coverage of 35 sq ft: 96 / 35 = 2.74 rolls — round up to 3 single rolls (or 2 double rolls: 96 / 70 = 1.37, round up to 2). With a large pattern repeat, add 20 percent: 96 x 1.20 = 115.2 sq ft, / 35 = 3.29, so 4 single rolls. The repeat allowance is the difference between 3 and 4 rolls — check the repeat size on the label before deciding, because it is the only variable that moves the answer.
Perimeter: 2 x (14 + 12) = 52 ft. Gross wall: 52 x 8 = 416 sq ft. Subtract one door (21 sq ft) and two windows (30 sq ft): 416 - 51 = 365 sq ft. Single rolls: 365 / 35 = 10.43, round up to 11. With a 20 percent pattern allowance: 365 x 1.20 = 438 sq ft, / 35 = 12.51, so 13 single rolls. In double rolls: 438 / 70 = 6.26, or 7 double rolls. Either way, verify the batch numbers match across every roll before the installer starts — mixed batches are the classic wallpaper regret.
Divide the wall length by the roll width and round up. A 4 m wall with a 0.53 m roll needs 8 strips — the calculator handles this for you.
Divide the roll length by your wall height and round down. A 10 m roll on a 2.5 m wall gives exactly 4 strips per roll.
Yes — buy one extra roll for patterned wallpaper. Aligning the pattern between strips wastes paper, and you want spare rolls from the same dye batch.