Steps Involved in Building a HouseSpike's Calculators

Wall Paper Calculator - Imperial

Spike's Calculators

Estimate the amount of Wallpaper needed for a Wall.

Wallpaper is manufactured in a variety of widths and lengths. Common roll widths are European/Metric 20 1/2 inch, American rolls 27 inches and Commercial wallpaper that is available in various widths 36", 48", 54" and 60".

Check the specifications of the wallpaper you are planning to use. It should tell you the roll width, length and the pattern (design) repeat. These plus wall length and height are the values you will need to calculate the amount of rolls you need to cover your wall.

The pattern repeat will calculate the use able amount of your roll of wall paper and will deduct a certain amount of waste you will get for having to match the design of your wallpaper for each drop. Adding a certain amount in addition to this for waste is not a bad idea. Having an extra roll will make your life much easier.

For wall openings such as windows and doors, ignore smaller sizes and calculate the total square footage of all openings combined that you wish to deduct from the area you are covering in wallpaper.

Length of Wall ft inch
Height of Wall ft inch
Wall Openings ft ²
Width of Roll inch
Length of Roll ft
Pattern Repeat inch
Waste %


Square Feet of Wall ft ²
Rolls to Cover Wall #
Waste Adds #
# of Rolls Needed #

The Calculation

  1. Enter the length of the wall. (feet + inches)
  2. Enter the height of the wall. (feet + inches)
  3. Enter the total amount of wall openings. (square feet)
  4. Enter the width of the roll of wallpaper. (inches)
  5. Enter the length of the roll of wallpaper. (feet)
  6. Enter the pattern (design) repeat of your wallpaper. (inches)
  7. Enter a waste factor if required. (percent)


  1. The total square footage of your wall minus openings (if any openings).
  2. The precise amount of rolls needed to cover the wall.
  3. The amount your selected Waste factor will add to result 2.
  4. The total amount in rolls of wallpaper you will need.

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