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Wallpaper Calculator

Rolls of wallpaper with pattern repeatRuns in your browser

Rolls needed
7
Strips (drops)
27
Strips per roll
4
Length per strip
8 ft

Buy every roll from the same batch (dye lot) and keep one spare for repairs.

Rough material cost

$315
Wallpaper: 7 × price per roll
$

Default prices are rough 2026 US big-box averages before tax and delivery. Edit them to match quotes from your local supplier.

Material estimates only. Round up, buy a little extra, and check with your supplier. Structural work (footings, framing, roofs) must follow local building codes; consult a licensed contractor where required.

Also works as:wallpaper roll calculatorhow much wallpaper do I needpeel and stick wallpaper calculator

How it works

Formulas

Strips = wall width ÷ roll width × (1 + waste %), rounded up
Strip length = wall height rounded up to whole pattern repeats
Rolls = strips ÷ whole strips per roll, rounded up

Worked example

Input: 12 × 10 ft room, 8 ft walls, 3 ft of doors, 20.5 in × 33 ft rolls, no repeat, 10% extra.

  1. Wall width: 2 × (12 + 10) − 3 = 41 ft = 492 in.
  2. 492 ÷ 20.5 = 24 strips × 1.10 = 26.4 → 27 strips.
  3. 33 ÷ 8 = 4 strips per roll.
  4. 27 ÷ 4 = 6.75 → 7 rolls.

Result: 7 rolls (with a 21 in repeat: 9 rolls).

How to use

  1. 1Enter the room length, width and wall height.
  2. 2Enter the total width of doors and wide windows to leave out.
  3. 3Enter the roll width and length from the label, and the pattern repeat.
  4. 4Buy the number of rolls shown, all from the same batch.

FAQ

Why count strips instead of square feet?

Wallpaper is hung in full-height strips, and the leftover piece at the end of a roll is often too short for another strip. Counting strips per roll gives the real number of rolls.

What does pattern repeat do?

Each strip has to start at the same point in the pattern, so its length is rounded up to a whole number of repeats. A 21 in repeat on an 8 ft wall makes each strip 8 ft 9 in, so a 33 ft roll gives 3 strips instead of 4.

What size is a roll of wallpaper?

US 'double rolls' are usually about 20.5 in × 33 ft (56 sq ft); European rolls are 53 cm × 10.05 m (5.3 m²).

Can I use metric units?

Yes. Switch to Metric and enter meters and centimeters; results show cubic meters, square meters or tonnes alongside US units.

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