Wallpaper Calculator
Work out how many wallpaper rolls you need — using the real strip-based method that accounts for roll size and pattern repeat — with U.S. pricing, a pattern-repeat comparison, and a downloadable PDF shopping list.
Pattern repeat drives waste — a large repeat can add several rolls. Always buy from the same dye lot and keep a spare roll. Estimates use 2024-2025 U.S. prices. For planning purposes only.
| Roll Size | Strips / Roll | Rolls Needed | Coverage / Roll |
|---|
For your walls at straight match, 12 in repeat. Double rolls usually give the best coverage per label.
How to use the wallpaper calculator
Four quick steps turn your walls into a full wallpaper order — rolls to buy by the real strip method, with the pattern repeat and roll size built in, plus U.S. pricing, a roll-size comparison, and a downloadable PDF shopping list.
Enter the walls
Wall perimeter × height, plus windows and doors; deduct door openings from the strip count.
Pick roll & pattern
Choose the roll size, the pattern match, and the vertical repeat printed on the label.
Set price & extras
Enter the price per roll, add a spare roll, and add an optional hanging labor rate.
Read results & save a PDF
Get rolls to buy, strips needed, a full cost breakdown, a roll-size comparison, and a material list.
How the wallpaper estimate is calculated
Wallpaper isn’t estimated by the square foot — it’s estimated by the strip, the way professional paperhangers do it. Each vertical strip is the wall height plus one pattern repeat, so the calculator works out how many strips a roll yields, how many strips wrap the room, and how many rolls that takes. Here is the exact math.
Worked example — a 14 × 16 ft room, 9 ft walls, U.S. double roll, straight match, 12 in repeat, 1 door
Strip length: 9 × 12 + 12 = 120 in
Strips per double roll: floor(396 ÷ 120) = 3 (a 33 ft double roll = 396 in)
Effective perimeter: 60 − (1 × 3) = 57 ft → Strips needed: ceil(57 ÷ 1.71) = 34
Rolls: ceil(34 ÷ 3) = 12, + 1 spare = 13
≈ 13 U.S. double rolls (including 1 spare), about $520 at $40 / double roll — before any hanging labor.
Same walls, three roll formats. U.S. wallpaper is priced and sold by the double roll — a single is half the length, so its count looks high even though the paper is the same. Estimate and order in double rolls.
Wallpaper estimating charts
Handy lookups for the questions people ask most — roll sizes and coverage, how the pattern match and repeat drive waste, and rolls by room. Figures use the calculator’s defaults (double rolls, +1 spare), so always confirm against your paper’s label.
| Roll type | Size (width × length) | Coverage / roll | Notes |
|---|---|---|---|
| U.S. single roll | 20.5 in × 16.5 ft | ~28 sq ft | Half a double; sold in pairs |
| U.S. double roll | 20.5 in × 33 ft | ~56 sq ft | The standard U.S. unit; priced per double |
| Wide / American | 27 in × 27 ft | ~61 sq ft | Wider strips, fewer per roll |
| European roll | 21 in × 33 ft | ~58 sq ft | Metric rolls; slightly wider than U.S. |
These are gross figures. Usable coverage is always less once each strip is trimmed for the pattern and the wall height — which is why the strip count, not raw square footage, gives a reliable roll number.
| Match type | How it aligns | Waste |
|---|---|---|
| Random / free match | No pattern to line up; cut strips end to end | Lowest |
| Straight match | Repeats straight across, edge to edge | Up to one repeat per strip |
| Half-drop match | Drops half a repeat on each next strip | Similar to straight |
The larger the vertical repeat, the more you trim off each strip to align it, so a big-repeat paper can need several extra rolls. Random-match papers have no repeat to align and waste the least.
| Ceiling height | No repeat | 12 in repeat | 20 in repeat | 32 in repeat |
|---|---|---|---|---|
| 8 ft | 4 strips | 3 strips | 3 strips | 3 strips |
| 9 ft | 3 strips | 3 strips | 3 strips | 2 strips |
| 10 ft | 3 strips | 3 strips | 2 strips | 2 strips |
A 33 ft double roll is 396 inches; strips per roll = the roll length divided by (height + repeat), rounded down. Each strip loses up to one full repeat to alignment, so a big repeat can drop you from 3 usable strips to 2 — and fewer strips per roll means more rolls.
| Room | Perimeter | Strips | Double rolls |
|---|---|---|---|
| Accent wall | 16 ft | 10 strips | 5 rolls |
| Powder room | 30 ft | 18 strips | 7 rolls |
| Bedroom 10×12 | 44 ft | 26 strips | 10 rolls |
| Room 14×16 | 60 ft | 36 strips | 13 rolls |
| Living 15×20 | 70 ft | 41 strips | 15 rolls |
Double rolls at 3 strips per roll, plus 1 spare, with no door deduction. Rolls climb fast with perimeter and repeat — deducting doors or choosing a random match can shave a roll or two.
perimeter ÷ width
one repeat per strip
doors off, paper around windows
Wallpaper is estimated by the strip, not the area. You wrap the room in vertical strips, each as tall as the wall plus one pattern repeat, then work out how many strips a roll yields.
- Strips — divide the wall perimeter by the roll width to get the number of vertical strips.
- Repeat — each strip is cut to the wall height plus one repeat so the pattern lines up, and that trim is waste.
- Openings — deduct about 3 ft of perimeter per door; paper around windows rather than skipping them.
Everything the calculator works out
One set of wall measurements gives you a complete order — rolls to buy, the strips behind the count, a full cost breakdown, and a costed roll-size comparison.
Key figures every wallpaper job depends on
Built for any wallpaper job
From a single accent wall to a whole papered room, the same calculator scales to the walls, the roll, and the pattern repeat.
Papering a room or an accent wall and wants the right roll count without over- or under-buying an expensive paper.
- Enter the repeat from the label
- Order in double rolls
- Add a spare and one dye lot
Bidding wallpaper and needs rolls, strips, and hanging labor per square foot in one place, with a clean material list.
- Compare roll sizes side by side
- Add a labor rate for a full bid
- Save the PDF material list for the quote
Adding feature walls to rentals or a flip and weighing paper cost against a bold-repeat design’s waste.
- Watch the repeat on big patterns
- Prime and size walls for easy removal
- Keep a spare for future repairs
7 tips for an accurate wallpaper order
Small habits keep your roll count right and your finished walls even, matched, and repairable.
Wallpaper calculator FAQ
The rolls, roll sizes, pattern repeat, and U.S. cost questions people ask most before wallpapering a room.
Wallpaper is estimated by the strip, not the square foot. Each vertical strip is the wall height plus one pattern repeat; you divide the roll length by that to get strips per roll, divide the wall perimeter by the roll width to get strips needed, then divide one by the other to get rolls.
A 14 × 16 ft room with 9 ft walls, a 12-inch repeat, and one door works out to about 34 strips at 3 strips per double roll — roughly 12 double rolls, or 13 with a spare.
A U.S. single and double roll are the same width; a double is simply twice the length — about 33 ft versus 16.5 ft — so it yields twice the strips.
Nearly all U.S. wallpaper is priced and sold by the double roll, even when it’s packaged as two single rolls. Estimate and order in double rolls so you don’t buy half of what you need.
The vertical repeat is how often the pattern restarts up the roll. Each strip has to be cut to the wall height plus up to one full repeat so the pattern lines up side to side, and that trim is wasted.
A large repeat can drop you from three usable strips per roll to two, which quickly adds several rolls. Random or free-match papers have no repeat to align and waste the least.
A straight match repeats straight across, so the same point on the pattern lines up on both edges of every strip at the same height. A half-drop match steps the pattern down half a repeat on each successive strip.
Both waste a similar amount of paper; the half-drop just changes the order you hang strips. A random match has nothing to align and is the most economical.
A U.S. double roll is about 56 sq ft of paper, a single about 28, a wide 27-inch roll about 61, and a European roll about 58. Those are gross figures.
Usable coverage is always less once you trim each strip for the pattern and for the wall height, which is why the strip method — not raw square footage — gives a reliable roll count.
Deduct doors, which take a chunk out of the wall — the calculator removes about 3 ft of perimeter per door from the strip count. Windows are usually papered around, not skipped, so their area is shown for reference only.
Because you paper above and below a window with the same pattern, it rarely saves a full strip. Leave windows in unless a whole strip would land inside the opening.
Wallpaper is printed in batches, and color can shift slightly between runs. A dye lot or run number on the label identifies paper printed together.
Order every roll for the job from the same dye lot so the color matches across the wall, and keep a spare from that lot — matching it later is often impossible once the run sells out.
Add at least one spare roll. It covers cutting mistakes, gives you matching paper for future repairs, and protects against a roll with a printing flaw.
A spare from the same dye lot is cheap insurance next to re-papering a wall later, especially for a discontinued or hard-to-match pattern.
In the U.S., wallpaper runs about $30 to $90 or more per double roll depending on brand, material, and design, with designer and specialty papers going well above that.
Professional hanging typically adds about $1 to $4 per square foot on top of the paper. Because rolls, repeat, and waste drive the paper cost, the roll count matters as much as the price per roll.
General Estimating Notice: This calculator estimates wallpaper by the strip — the method professional paperhangers use — from your wall perimeter and height, roll size, pattern match, and repeat, using typical 2024–2025 U.S. prices. Actual rolls vary with the pattern, how strips fall around openings and corners, and cutting, so always check your paper’s label and buy from a single dye lot. Larger repeats and taller walls need more paper, and keeping a spare roll is strongly recommended. For planning purposes only.