Wallpaper Calculator: How Many Rolls Do I Need?
Calculate how many rolls of wallpaper to buy for a room, allowing for doors, windows and pattern matching.
A 12 × 12 ft room with 8-ft walls, one door and two windows needs about 14 single rolls of wallpaper (7 double rolls) at 28 sq ft usable per roll, including 10% extra for pattern matching. Formula: net wall area × 1.10 ÷ usable sq ft per roll.
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How to calculate wallpaper rolls
Find the paper area you need, add an allowance for pattern matching, divide by the usable area of a roll, and round up. Usable coverage is lower than the printed roll size because matching and trimming consume paper.
rolls = wall area × (1 + pattern allowance) ÷ usable sq ft per roll
A typical US single roll is about 20.5 inches wide and 16.5 feet long, which is roughly 28 square feet before matching, and rolls are usually sold as doubles. European rolls are narrower and longer. Always read the roll's width, length and pattern repeat on the label.
Single rolls needed by room size (8 ft walls, 1 door, 2 windows, small repeat)
| Room size | Net wall area | Single rolls | Double rolls |
|---|---|---|---|
| 10 × 10 ft | 269 sq ft | 11 | 6 |
| 10 × 12 ft | 301 sq ft | 12 | 6 |
| 12 × 12 ft | 333 sq ft | 14 | 7 |
| 12 × 14 ft | 365 sq ft | 15 | 8 |
| 14 × 16 ft | 429 sq ft | 17 | 9 |
| 16 × 20 ft | 525 sq ft | 21 | 11 |
Pattern repeat
Straight patterns and textures need the least extra. Large half-drop or random-match patterns can add 15–25% in waste. Order everything at once so all rolls share the same dye lot, and keep a spare roll for repairs.
Peel-and-stick and murals
Peel-and-stick rolls are usually narrower (about 20 inches) and shorter, so divide your wall area by the usable coverage printed on the pack. Murals are sold as complete sets: measure each wall's width and height and compare with the mural dimensions.
If you'd rather paint, switch to the paint calculator; prep walls first with the drywall calculator if you're patching.
Frequently asked questions
How many rolls of wallpaper for a 12×12 room?
A 12×12 room with 8-foot walls, one door and two windows needs about 14 single rolls (7 double rolls) of 28 sq ft usable, including 10% extra.
How much extra wallpaper should I buy?
At least 5–10%; up to 15–25% for large pattern repeats.
How many rolls of wallpaper for an accent wall?
A single 12-ft wall with 8-ft height is 96 sq ft — about 4 single rolls with a small repeat.
How many square feet is a roll of wallpaper?
US single rolls typically cover about 28–36 sq ft before pattern matching, and rolls are often sold as doubles. Sizes vary widely, so check the label for width and length.
Do I include the ceiling?
Only if you plan to paper it. Add length × width to the area.
Should I subtract windows and doors?
Yes for large openings. If you're unsure, skip deductions and treat that as your waste allowance.
How do I calculate wallpaper for a bathroom?
Measure the wall perimeter and height, subtract the tub area, door and window, and add pattern waste. Use moisture-rated wallpaper.
Can I return unused rolls?
Many retailers accept unopened rolls from the same batch within a set period. Check the policy before ordering.
Related calculators
. Estimates only. Always confirm quantities with your supplier or a qualified contractor before ordering, and add extra for waste and site conditions.