How many rolls of wallpaper do I need for a 12 x 12 room?

With 8 ft walls, one door, two windows, a 21 inch pattern repeat, and US double rolls, about 10 rolls including 10% waste. A plain paper with no repeat needs about 7, because each roll then gives four strips instead of three.

How many square feet does a roll of wallpaper cover?

A US double roll is about 56 sq ft printed, but on an 8 ft wall you get three full strips, which covers about 41 sq ft. A European roll (0.53 x 10.05 m) is about 5.3 sq m printed and gives 3 or 4 strips on a 2.4 to 2.7 m wall, depending on the height and repeat.

Should I subtract doors and windows?

Yes, for full doors and big windows. Leave small windows in the total if you are new to hanging paper, since cutting around them wastes more than you think.

Why add 10% for waste?

Walls are rarely square, strips get torn or mismatched, and you trim around outlets and corners. 10% covers that, and a spare roll from the same batch is handy for repairs later.

What is a drop match versus a straight match?

A straight match lines up across the same height on each strip. A drop match shifts by half the repeat on every other strip, which can waste more. Enter the full repeat from the label either way. The calculator allows one full repeat per strip.

Does this work for peel-and-stick wallpaper?

Yes. Choose custom roll size and type in the width and length from the box. Peel-and-stick rolls are often around 24 in by 12 to 16 ft, so you will need more of them than standard rolls.

How much does it cost to wallpaper a 12 x 12 room?

In the worked example above, 340 sq ft needs covering. At Angi’s labor range of $1 to $4 per sq ft that is about $340 to $1,360 for installation, plus 10 double rolls of paper at whatever your paper costs. Enter both prices in the calculator for your own total.

How do I convert wall measurements in inches to square feet?

Multiply width x height in inches and divide by 144. A wall 144 inches wide and 96 inches high is 13,824 square inches, or 96 sq ft.

How much does wallpaper removal cost?

Taskrabbit’s cost guide puts removal at about $1 to $3 per square foot, with extra charges if the walls need patching afterward. Add it to the installer rate if you are papering over a wall that already has paper on it.

Wallpaper Calculator: How Many Rolls Do You Need?

Quick answer

Divide the wall area you are covering (minus doors and windows), plus 10% for waste, by the area one roll actually covers once you cut it into full-height strips. Four 12 x 8 ft walls with one door, two windows, and a 21 in pattern repeat need 10 US double rolls.

Wall width (ft)Wall height (ft)Number of walls this size

DoorsArea of each door (sq ft)WindowsArea of each window (sq ft)

Roll size

Roll width (in)Roll length (ft)Pattern repeat (in, 0 if none)

Wallpaper price per roll (optional, $)Installer rate (optional, $)Installer charges per

10 rolls

Wall area 384 sq ft, minus 44 sq ft of doors and windows = 340 sq ft to cover. Each strip is 9.92 ft (wall + repeat + trim), so one roll gives 3 full strips and covers 41 sq ft. With 10% waste that is 9.1 rolls, rounded up to 10.

Area to cover: 340 sq ft (31.6 sq m).

These results are estimates. Measure your space and check the product's listed size before you buy.

How do you calculate how many rolls of wallpaper you need?

Measure each wall at its widest point and its full height from baseboard to ceiling. Multiply width by height and add the walls together. Take off the doors and windows you will not paper over.

Then work out how many full-height strips one roll gives you. Each strip is the wall height, plus one pattern repeat so the design lines up, plus about 2 inches (5 cm) to trim at the top and bottom. Leftover length shorter than a strip is waste, so a roll only covers its strips, not its printed area.

Add 10% for mistakes, crooked walls, and the strips you cut around outlets. Round up to a whole roll.

What size is a standard roll of wallpaper?

In the US, most wallpaper is sold as a double roll, about 20.5 inches wide and 33 feet long, roughly 56 square feet. Prices are often quoted per single roll even though you can only buy doubles, so check which one the price means.

A standard European roll is 0.53 m wide and 10.05 m long, about 5.3 square meters. It is close to the same size as a US double roll, but Europe calls it one roll. Peel-and-stick, grasscloth, and commercial vinyl come in other sizes, so use the custom option and type in the size on the label.

How does pattern repeat change the number of rolls?

The repeat is the distance before the pattern starts again, printed on the label in inches or centimeters. Every strip has to start at the same point in the pattern, so you lose up to one repeat per strip.

On an 8 ft wall, a plain or random-match paper gets four strips from a US double roll. A 21 inch repeat makes each strip about 9.9 ft, so the same roll gives three. On a 9 ft wall a 27 inch repeat makes each strip about 11.4 ft and you only get two strips a roll. That is where the count jumps.

Worked example: a 12 x 12 ft bedroom

Four walls, each 12 ft wide and 8 ft high: 4 x 12 x 8 = 384 sq ft. One door (36 x 80 in, about 20 sq ft) and two windows (3 x 4 ft, 12 sq ft each) take off 44 sq ft. That leaves 340 sq ft to cover.

The paper is a US double roll, 20.5 in wide and 33 ft long, with a 21 inch repeat. Each strip is 8 ft + 1.75 ft + 2 in = 9.92 ft. 33 / 9.92 = 3.3, so you get 3 full strips a roll. 3 strips x 8 ft x 1.71 ft = 41 sq ft covered per roll.

340 x 1.10 = 374 sq ft. 374 / 41 = 9.1, so buy 10 double rolls. Buy them all at once from the same batch (dye lot), because a second order can come out a slightly different shade.

Should you wallpaper an accent wall in a rental instead?

In a small apartment one wall usually does the job. Set the number of walls to 1, enter that wall, and the count drops fast. If you rent, check the lease first and test any peel-and-stick paper on a hidden patch, because adhesive can lift paint when it comes off.

How much does wallpaper installation cost?

Installers usually charge by the square foot or by the roll. Angi’s 2026 cost guide puts labor at about $1 to $4 per square foot (or $30 to $80 an hour), and Taskrabbit’s guide puts standard wallpaper at about $2 to $6 per square foot, rising to $6 to $14 for grasscloth, murals, and other hard-to-hang papers. Many installers also set a minimum fee for small jobs.

Enter your installer’s quote in the calculator and choose per square foot or per roll. A per-square-foot rate is multiplied by the area you are covering after doors and windows, and a per-roll rate by the number of rolls. Add the price per roll to see paper and labor together. Removing old paper is usually extra: Taskrabbit puts removal at about $1 to $3 per square foot.

Can you measure in inches or enter the square footage?

Yes. Pick Inches to type the wall width and height straight from a tape measure, for example 144 x 96 inches for a 12 x 8 ft wall. Door and window areas and the roll size stay in their usual units (square feet, inches, and feet).

If you already know the total wall area, choose Total wall area and enter it in square feet (or square meters in metric). You still need the wall height, because the number of full-height strips you can cut from each roll depends on it. The result also shows the area to cover in both square feet and square meters.

What is the wallpaper formula?

Area to cover = (wall width x wall height x number of walls) - doors - windows
Strip length = wall height + pattern repeat + 2 in (5 cm) trim
Strips per roll = roll length / strip length, rounded down
Area per roll = strips per roll x wall height x roll width
Rolls = (area to cover x 1.10) / area per roll, rounded up
Inches to square feet: width (in) x height (in) / 144
Installation = area to cover x rate per sq ft, or rolls x rate per roll
Total cost = rolls x price per roll + installation

Sources

Frequently asked questions

How many rolls of wallpaper do I need for a 12 x 12 room?: With 8 ft walls, one door, two windows, a 21 inch pattern repeat, and US double rolls, about 10 rolls including 10% waste. A plain paper with no repeat needs about 7, because each roll then gives four strips instead of three.
How many square feet does a roll of wallpaper cover?: A US double roll is about 56 sq ft printed, but on an 8 ft wall you get three full strips, which covers about 41 sq ft. A European roll (0.53 x 10.05 m) is about 5.3 sq m printed and gives 3 or 4 strips on a 2.4 to 2.7 m wall, depending on the height and repeat.
Should I subtract doors and windows?: Yes, for full doors and big windows. Leave small windows in the total if you are new to hanging paper, since cutting around them wastes more than you think.
Why add 10% for waste?: Walls are rarely square, strips get torn or mismatched, and you trim around outlets and corners. 10% covers that, and a spare roll from the same batch is handy for repairs later.
What is a drop match versus a straight match?: A straight match lines up across the same height on each strip. A drop match shifts by half the repeat on every other strip, which can waste more. Enter the full repeat from the label either way. The calculator allows one full repeat per strip.
Does this work for peel-and-stick wallpaper?: Yes. Choose custom roll size and type in the width and length from the box. Peel-and-stick rolls are often around 24 in by 12 to 16 ft, so you will need more of them than standard rolls.
How much does it cost to wallpaper a 12 x 12 room?: In the worked example above, 340 sq ft needs covering. At Angi’s labor range of $1 to $4 per sq ft that is about $340 to $1,360 for installation, plus 10 double rolls of paper at whatever your paper costs. Enter both prices in the calculator for your own total.
How do I convert wall measurements in inches to square feet?: Multiply width x height in inches and divide by 144. A wall 144 inches wide and 96 inches high is 13,824 square inches, or 96 sq ft.
How much does wallpaper removal cost?: Taskrabbit’s cost guide puts removal at about $1 to $3 per square foot, with extra charges if the walls need patching afterward. Add it to the installer rate if you are papering over a wall that already has paper on it.

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