2451
Wallpaper rolls calculator
Put your room length, width, wall height, roll coverage and waste in: a 14 ft by 11 ft room with 9 ft walls needs 450 sq ft of wall, 495 sq ft with 10% waste, 8.84 rolls exact, 9 rolls to buy at 56 sq ft a roll.
★ CONSTRUCTION · WALLPAPER · ROLLS
Wallpaper Rolls Calculator: 9 Rolls for a 14x11 Room
On the defaults — a 14 ft by 11 ft room, 9 ft walls, 56 sq ft a roll, 10% waste — you need 9 rolls, 8.84 exact. This is the wallpaper rolls tool: measure the walls once, add the waste, and order the rolls once — a room one roll short waits for no matching batch.
What does wallpaper rolls needed 9 rolls mean?
It means a 14 ft by 11 ft room with 9 ft walls has 450 sq ft of wall, and with 10% waste for pattern matching and trimming that becomes 495 sq ft to cover, which is 8.84 rolls at 56 sq ft a roll — so you buy 9 rolls, since wallpaper is sold by the whole roll. The wall area is the perimeter times the height: 2 × (14 + 11) × 9 = 450. The waste multiplies it, and the roll coverage divides it. The buy figure is the shopping number, while the exact figure is the planning number: 8.84 rolls tells you the ninth roll is barely touched, so a room a little smaller would buy 8.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Wall area | 2 × (length + width) × height | 450 sq ft — 2 × (14 + 11) × 9. |
| Area with waste | wall area × (1 + waste) | 495 sq ft — 450 × 110%. |
| Rolls exact | area with waste ÷ roll coverage | 8.84 rolls — 495 ÷ 56. |
| Rolls to buy | exact, rounded up | 9 rolls — 8.84, rounded up. |
Three things to check before you trust the number
First, measure the walls you will actually paper, not the room on a plan: subtract large windows and doors if you want a tight figure, since this calculator counts the full wall area and a wall of glass papers far less. Second, read the coverage off your own roll, not off a memory: a large pattern repeat wastes far more than a plain paper, and 10% may be too little for it. Third, remember the ceiling is not counted here — a papered ceiling needs its own length × width added. For the paint version of the same wall, the paint coverage calculator counts the gallons.
Worked example
14 ft long, 11 ft wide, 9 ft walls, 56 sq ft a roll, 10% waste. Wall: 2 × (14 + 11) × 9 = 450 sq ft. With waste: 450 × 110% = 495 sq ft. Exact: 495 ÷ 56 = 8.84 rolls. Buy: 9 rolls. In practice that means buying 9 rolls, opening eight, and keeping the ninth mostly full for repairs — the classic wallpaper leftover, and far better than a short final strip with no matching roll in the shop.
Every branch, checked
With a 16 ft room instead of 14 ft, the wall rises to 486 sq ft and the area with waste to 534.6 sq ft, 9.55 rolls exact, 10 rolls to buy. With 8 ft walls instead of 9 ft, the wall falls to 400 sq ft and the area with waste to 440 sq ft, 7.86 rolls exact, 8 rolls to buy — height is the dearest change, since it lifts every wall. With 0% waste instead of 10%, the area falls to 450 sq ft, 8.04 rolls exact, still 9 rolls to buy. With 75 sq ft a roll instead of 56, the exact falls to 6.6 rolls, 7 rolls to buy. Length, height, waste and roll coverage each move the room on their own, so a wrong height figure is as costly as a wrong length.
The reverses, worked backwards
The length behind 9 rolls is 14 ft: at 12 ft the need is 9 rolls (12 ft long, 11 ft wide, 9 ft walls, 414 sq ft wall, 10% waste, 455.4 sq ft with waste, 56 sq ft a roll, 8.13 rolls exact); at 16 ft it is 10 rolls (16 ft long, 11 ft wide, 9 ft walls, 486 sq ft wall, 10% waste, 534.6 sq ft with waste, 56 sq ft a roll, 9.55 rolls exact). The waste behind 9 rolls is 10%: at 0% the need is 9 rolls (14 ft long, 11 ft wide, 9 ft walls, 450 sq ft wall, 0% waste, 450 sq ft with waste, 56 sq ft a roll, 8.04 rolls exact); at 20% it is 10 rolls (14 ft long, 11 ft wide, 9 ft walls, 450 sq ft wall, 20% waste, 540 sq ft with waste, 56 sq ft a roll, 9.64 rolls exact). The roll coverage behind 9 rolls is 56 sq ft a roll: at 40 sq ft a roll the need is 13 rolls (14 ft long, 11 ft wide, 9 ft walls, 450 sq ft wall, 10% waste, 495 sq ft with waste, 40 sq ft a roll, 12.38 rolls exact); at 75 sq ft a roll it is 7 rolls (14 ft long, 11 ft wide, 9 ft walls, 450 sq ft wall, 10% waste, 495 sq ft with waste, 75 sq ft a roll, 6.6 rolls exact). Each reverse moves one input and holds the rest, so the step is exactly one length, waste or roll-coverage change.
What the defaults assume
The defaults assume a rectangular 14 ft by 11 ft room, 9 ft walls, 56 sq ft a roll, and 10% waste. They do not assume doors, windows, ceilings, or a large pattern repeat — a bold repeat can waste far more than 10%, and a wall of windows papers far less than its full area.
Who uses this
- A homeowner papering a bedroom: the 9-roll buy settles the wallpaper order before the first strip is pasted.
- A decorator quoting a room: the wall, waste and exact figures off the calculator are the lines on the quote, not a guess.
- A DIY paperhanger on a budget: the exact figure shows whether the room is an 8-roll or a 9-roll room, so the ninth roll is a choice, not a surprise.
- A landlord refreshing between tenants: the same maths on every room size gives the wallpaper order for the whole flat in one pass.
Accuracy & limitations
The arithmetic is exact for the inputs entered; the judgement is the waste and the deductions. Real papers waste more on large repeats and less on plain papers, and real rooms lose wall to doors and windows — the tape on the wall overrides any planning figure. Treat 9 rolls as the planning buy for a 14 ft by 11 ft room at 9 ft walls and 10% waste, and check the roll label for the paper you actually bought before ordering.
Cite this calculator
Bright Side Kit, “Wallpaper Rolls Calculator: 9 Rolls for a 14x11 Room”, https://brightoolbox.com/wallpaper-rolls-calculator/, accessed 3 November 2026. Students and researchers: cite the calculator name, the page URL and the date you used it, and quote the defaults (14 ft long, 11 ft wide, 9 ft walls, 56 sq ft a roll, 10% waste) so the 9-roll result can be checked.
Frequently asked questions
How many wallpaper rolls do I need for a 14x11 room?
9 rolls at 9 ft walls and 10% waste: 450 sq ft of wall, 495 sq ft with waste, 8.84 rolls exact at 56 sq ft a roll, rounded up to 9 rolls to buy.
How do I work out wallpaper rolls for a room?
Multiply the perimeter by the height for wall area, add waste for pattern matching, then divide by roll coverage. A 14 ft by 11 ft room at 9 ft walls is 450 sq ft of wall; with 10% waste it is 495 sq ft.
Why add waste to wallpaper?
Because pattern matching, trimming at the ceiling and skirting, and the odd spoiled strip all eat paper: 10% on the defaults, more for a large pattern repeat. A plain paper wastes least, a bold repeat wastes most.
Why round the rolls up?
Because wallpaper is sold by the whole roll: 8.84 rolls exact means eight full rolls plus most of a ninth, so the shop sells you 9. The leftover ninth roll is your repair stock.
Should I subtract doors and windows?
For a tight order, yes: this calculator counts the full wall area, so a wall of glass over-counts. Measure the door and window areas and subtract them from the wall area before adding waste.
What if my walls are 8 ft instead of 9 ft?
Height lifts every wall at once: the same 14 ft by 11 ft room at 8 ft walls has 400 sq ft of wall and needs 440 sq ft with waste, 7.86 rolls exact, 8 rolls to buy.