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Wallpaper calculator
Put your room size in: a 12 ft by 10 ft room with 8 ft ceilings has 352 sq ft of wall, and at 56 sq ft a roll that needs 7 rolls.
★ CONSTRUCTION · WALLPAPER · ROLLS
Wallpaper Calculator: 7 Rolls for a 12×10 ft Room, 8 ft
On the defaults — a 12 ft by 10 ft room, 8 ft ceilings, 56 sq ft a roll — you need 7 rolls. This is the wallpaper tool: measure the room once, and buy the paper once, from one batch, with the spare roll kept for matching.
What does wallpaper needed 7 rolls mean?
It means seven rolls of paper, at the standard 56 sq ft a roll, cover the walls of this room with a little to spare. The wall area is the whole story: two long walls of 12 by 8 ft and two short walls of 10 by 8 ft add to 352 sq ft, and 352 divided by 56 is 6.29 rolls. You cannot buy 0.29 of a roll, so it rounds up to 7 — and that seventh roll is not waste, it is the matching spare for pattern repeats, miscuts and the patch the room will need one day.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Wall area | 2 × (length + width) × height | 352 sq ft — 2 × (12 + 10) × 8. |
| Roll coverage | one standard roll | 56 sq ft per roll. |
| Exact rolls | wall area ÷ roll coverage | 6.29 rolls — 352 ÷ 56. |
| Buy | round up to whole rolls | 7 rolls — the spare covers matching and miscuts. |
Three things to check before you trust the number
First, check the coverage on your roll: 56 sq ft is a common standard roll, but a roll with a large pattern repeat loses usable paper to matching, and can need an extra roll on a room this size. Second, decide whether doors and windows come off the area: this calculator sizes the full walls, and a standard door saves only about 0.4 of a roll, so it rarely changes the count. Third, remember the ceiling is not counted: papering the ceiling too adds its 120 sq ft, which takes this room from 7 rolls to 10.
Worked example
12 ft long, 10 ft wide, 8 ft ceilings, 56 sq ft a roll. Wall area: 2 × (12 + 10) × 8 = 352 sq ft. Exact rolls: 352 ÷ 56 = 6.29. Buy 7 rolls. In practice that means six rolls go on the walls and the seventh stays wrapped until a strip is miscut or a seam needs patching — buy all seven from the same batch, since dye lots differ slightly. If the same room had 9 ft ceilings, the area would be 396 sq ft and the need 8 rolls, so the ceiling height alone would change the shop list.
Every branch, checked
With a 16 ft long room instead of 12 ft, the area rises to 416 sq ft and the need to 8 rolls. With 9 ft ceilings, the area rises to 396 sq ft and the need to 8 rolls. With 7 ft ceilings, the area falls to 308 sq ft and the need to 6 rolls. With a 14 ft wide room, the area rises to 416 sq ft and the need to 8 rolls. The roll count is a step function: small changes in area often change nothing, until they cross a whole roll.
The reverses, worked backwards
The length behind 7 rolls is 12 ft: at 10 ft the need is 6 rolls; at 14 ft it is still 7 rolls, since 384 sq ft is only 6.86 rolls. The width behind 7 rolls is 10 ft: at 8 ft the need is 6 rolls; at 12 ft it is still 7 rolls. The height behind 7 rolls is 8 ft: at 7 ft the need is 6 rolls; at 9 ft it is 8 rolls. Each reverse moves one input and holds the rest, so the step is exactly one dimension.
What the defaults assume
The defaults assume a 12 ft by 10 ft room with 8 ft ceilings, straight walls, and a standard roll covering 56 sq ft. They do not assume doors and windows subtracted, a large pattern repeat, sloped ceilings, or the ceiling papered — a big repeat can add a roll, and the ceiling adds three.
Who uses this
- A homeowner papering a bedroom: the 7-roll buy settles the shop list before the first strip is cut.
- A renter refreshing one feature wall: the same maths on one wall only — length times height, divided by 56 — gives that wall’s rolls.
- A landlord turning a flat between tenants: the same maths per room, times the room count, prices the whole repaper.
- A decorator quoting a job: wall area first, coverage second, rolls third — the quote follows the same three steps.
Accuracy & limitations
The arithmetic is exact for the inputs entered; the judgement is the roll coverage. Real rolls lose paper to pattern matching: a large repeat can waste a foot or more per strip, and that waste is not in the 56 sq ft figure. Treat 7 rolls as the planning figure for a small repeat, and add a roll for a large one; if the roll states a different coverage, re-run with that figure — the area maths does not change, only the division.
Cite this calculator
Bright Side Kit, “Wallpaper Calculator: 7 Rolls for a 12×10 ft Room, 8 ft”, https://brightoolbox.com/wallpaper-calculator/, accessed 2 November 2026. Students and researchers: cite the calculator name, the page URL and the date you used it, and quote the defaults (12 ft × 10 ft room, 8 ft ceilings, 56 sq ft per roll) so the 7-roll result can be checked.
Frequently asked questions
How many rolls of wallpaper do I need for a 12×10 room?
7 rolls. The walls total 352 sq ft, and at 56 sq ft a roll that is 6.29 rolls, rounded up to whole rolls.
How many square feet does a roll of wallpaper cover?
About 56 sq ft for a standard roll, which is the rate this calculator uses. Check your roll: a large pattern repeat loses usable paper to matching, so the effective coverage can be lower.
Should I subtract doors and windows from the wall area?
For a shop list, no: a standard door saves only about 0.4 of a roll, so it almost never changes the count. For a precise quote, subtract about 21 sq ft per door and 15 sq ft per window first.
Do I need an extra roll for pattern matching?
For a large repeat, yes — add one roll to the count here. A small repeat or a plain paper needs no extra roll beyond the rounded-up seventh.
What if I am also papering the ceiling?
Add the ceiling area — 12 × 10 = 120 sq ft — to the wall area first. That takes this room to 472 sq ft, or 8.43 rolls, so buy 9 rolls, not 7.
Why buy all the rolls from one batch?
Dye lots differ slightly between batches, and a shade difference shows across a seam. The seventh roll in this room is the spare — buy it with the rest, from the same batch.