𧱠Wallpaper Rolls Calculator
Find exactly how many rolls your room needs, with pattern repeat and a safety roll included.
Total Rolls to Buy
How to Use This Calculator
This calculator figures out how many wallpaper rolls you need for your walls, accounting for the pattern repeat waste that most rough estimates ignore, and it adds one safety roll at the end.
Measure the total width of all walls you will paper, in feet, and the wall height from floor to ceiling. For multiple walls, add their widths together.
Enter the number of doors and windows and their average size (21 sq ft each is a typical door), or enter the total deduction in square feet directly, which overrides the count.
Enter your roll specs from the label: width in inches (20.5 is standard US), length in feet (33 is standard), and the pattern repeat in inches (0 for plain paper).
Read the result: strips needed, strips per roll, rolls required, and the final buy count with the safety roll. Add a price per roll for a cost estimate.
The Math Behind the Rolls
Openings are converted to an equivalent width: deduction square footage divided by wall height gives the width of wall the doors and windows "erase". The pattern repeat matters because every strip must be cut one full repeat longer than the wall height so the design aligns at the ceiling line from strip to strip. That extra length is pure waste, and it is why a bold 24-inch repeat can nearly double your roll count versus plain paper on the same wall.
Worked Example
A 12-foot wide, 8-foot high wall with no doors or windows, using standard US rolls (20.5 inches wide, 33 feet = 396 inches long) and a 12-inch pattern repeat. Net width is 144 inches, so strips needed = ceil(144 / 20.5) = 8 strips. Each strip is cut to 96 + 12 = 108 inches. Strips per roll = floor(396 / 108) = 3. Rolls required = ceil(8 / 3) = 3, plus the safety roll = 4 rolls to buy. With no pattern repeat, each strip is 96 inches, giving floor(396 / 96) = 4 strips per roll, so ceil(8 / 4) = 2 rolls plus safety = 3 rolls. The repeat alone costs you one extra roll here.
Measuring Guide and Buying Tips
Measure each wall at the widest point and add the widths; walls are rarely perfectly straight, so round every measurement up to the next half foot. Measure height at two or three spots and use the tallest. Do not deduct trim and baseboards; the small overage is your cutting margin. When buying, check that every roll carries the same batch number, because dye lots vary and the mismatch shows on the wall. A US double roll is just two single rolls joined, so if your store sells double rolls, halve the calculator result and round up. For peel-and-stick paper the math is identical, but order with extra confidence: it is repositionable, so miscuts are recoverable, while pasted paper punishes mistakes. Keep one full unopened roll from the same batch after the job; it is your insurance against future scuffs, and discontinued patterns cannot be reordered.
Frequently Asked Questions
What is pattern repeat?
Pattern repeat is the vertical distance before the wallpaper design starts over, printed on the roll label in inches. A 12-inch repeat means every strip must be cut 12 inches longer than the wall height so the pattern lines up at the ceiling across strips. That extra length is waste: it is why patterned wallpaper needs more rolls than a plain one for the same wall.
What is the difference between single and double rolls?
A US single roll covers about 28 to 35 square feet (typically 20.5 inches wide by 33 feet long). A double roll is twice as long, about 56 to 70 square feet, and is the standard unit wallpaper is priced and sold in. European rolls are usually wider (about 21 inches) and shorter (about 33 feet). This calculator counts in single rolls; if you buy double rolls, divide the result by two and round up.
What is a batch number and why does it matter?
The batch (or dye lot) number marks rolls printed in the same production run. Colors can shift slightly between runs, and the difference shows on the wall even when the rolls look identical in the store. Buy all your rolls, including the safety roll, with the same batch number, and keep one unopened roll from that batch for future repairs.
Peel-and-stick vs pasted wallpaper: which should I choose?
Peel-and-stick is repositionable and renter-friendly, and it forgives measuring mistakes because you can lift and re-stick a strip. It costs more per square foot and can struggle on textured walls or in steamy bathrooms. Traditional pasted wallpaper is cheaper, more durable, and comes in far more patterns, but mistakes are harder to undo. For a first-timer on smooth walls, peel-and-stick is the easier win.
Should I really buy an extra roll?
Yes. The calculator adds one safety roll because real walls are never perfectly square, patterns force offcuts, and one miscut strip can otherwise stall your whole project. Leftover paper from the same batch is also your repair stock for scuffs and tears years later. Returning an unopened roll is cheap; reordering a discontinued pattern is often impossible.