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Wallpaper calculator

How many rolls do I need?

Square footage alone under-orders. Pattern repeat, match type and roll size decide how many usable strips each roll gives you. Enter your wall and the paper's specs; we'll confirm the count on a free measure before you buy.

Roll calculator

How much wallpaper do I need?

Square footage alone under-orders, because pattern repeat and roll size decide how many usable strips each roll gives you. Enter your wall and the paper's specs; we'll confirm the count on a free measure before you order.

Most American papers are sold as double rolls (about 20.5" × 33', roughly 56 sq ft). Check the product page for width, length and repeat.

The math

What the calculator is doing

1. Strips, not square feet. Wallpaper goes up in vertical strips. Each strip has to be the wall height plus about four inches of trim allowance, rounded up to a whole pattern repeat so the pattern lines up strip to strip. A 9-foot wall with a 24-inch repeat needs 120-inch strips, not 108.

2. Strips per roll. A double roll is usually 33 feet long. Divide by the strip length: 396 inches ÷ 120 = three usable strips per roll, and the leftover 36 inches is waste (or short pieces over doors).

3. Strips across the wall. Total wall width in inches ÷ roll width (20.5 inches on most American papers, 27 on some, 24 on murals) = strips needed. We subtract half a strip per full-height door and nothing for windows — the pieces above and below a window still come out of a full strip.

4. Rolls. Strips needed ÷ strips per roll, rounded up, plus 10% overage, all ordered together from one dye lot. Reorders rarely match.

Half-drop match. Every other strip starts half a repeat lower, so we allow an extra half repeat per strip. Random match (most grasscloth and textures) has no repeat — enter 0.

Murals and panels are sized to your wall by the printer; send us the dimensions and we'll check the panel count instead.

Roll sizes vary by brand: check the product page for width, length and repeat. European rolls are typically 20.5 inches by 33 feet (about 56 square feet); some US heritage lines sell 27-inch by 27-foot rolls; print-on-demand houses sell 24-inch panels in fixed lengths.

FAQ

Calculator questions

Why does the calculator give more rolls than the square footage suggests?
<p>Because pattern repeat and strip length create waste that square footage ignores. A 24-inch repeat on a 9-foot wall wastes about a foot per strip, and each roll only yields whole strips. Retailers' own measuring guides warn against ordering by square footage for the same reason.</p>
Should I subtract windows and doors?
<p>Only large ones. The calculator subtracts half a strip per full-height door and nothing for windows, because the pieces above and below a window still come out of a full-length strip. That's your safety margin.</p>
What if my paper is sold as single rolls or panels?
<p>Enter the real roll width and length from the product page; the result is in rolls of that size. Most American papers are packaged as double rolls even when priced per single roll. For murals and panels, send us the wall dimensions.</p>
Will you confirm the count before I order?
<p>Yes — send the product link and your wall dimensions, or book a free measure. We give you the number in writing so you order once, from one dye lot.</p>
Path one

I already have my wallpaper.

Send us the brand and pattern link, three photos and your wall dimensions. You'll have a written price in one business day, or book a route-friendly measure online right now.

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Path two

Help me choose.

Book a Design Session. We measure, shortlist five to ten papers from trade accounts that fit your room and budget, order the samples, and calculate the rolls — and the fee comes off your install.

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Ready when you are

Order once. Order right.

Send the product link and your wall dimensions and we'll confirm the roll count in writing, from one dye lot, before you spend a dollar on paper.