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Calcimator

Wallpaper Repeat Calculator

Calculate the number of wallpaper rolls needed, accounting for pattern repeat waste, ceiling height, and room perimeter.

Inputs

ft
ft
in
in
ft

Results

Rolls Needed

11 rolls

Total Wall Area448 sq ft
Waste Percentage27.8%
Usable Area per Roll41 sq ft
Strips per Roll3 strips
How to Use This Calculator
  1. Enter Room Perimeter, Ceiling Height, and Pattern Repeat.
  2. Set Roll Width and Roll Length.
  3. Review the Rolls Needed (rolls) result.
  4. Use Total Wall Area (sq ft) and Waste Percentage (%) to inform your decision.

How the result changes with Room Perimeter

Room PerimeterRolls Needed
296 rolls
7716 rolls
13427 rolls
18136 rolls

What each input means

Room Perimeter
Total perimeter of walls to be papered (subtract doors/windows if desired).
Ceiling Height
Height from floor to ceiling in feet.
Pattern Repeat
Vertical pattern repeat distance in inches. Use 0 for no pattern.
Roll Width
Width of wallpaper roll — US standard is 20.5", Euro standard is 21".
Roll Length
Length per roll — US single roll is ~33 ft, double roll is ~56 ft.

What each result means

Rolls Needed
Total rolls to purchase (rounded up for safety).
Total Wall Area
Wall surface area to be covered.
Waste Percentage
Estimated material waste from pattern matching and trimming.
Usable Area per Roll
Actual coverage per roll after accounting for pattern repeat.
Strips per Roll
Number of full-height strips you can cut from one roll.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Room Perimeter = 56, Ceiling Height = 8, Pattern Repeat = 12, Roll Width = 20.5 = 5 input(s) provided
  2. Calculate Rolls Needed
    Rolls Needed
    11 = 11
  3. Calculate Total Wall Area
    Total Wall Area
    448 = 448
  4. Calculate Waste Percentage
    Waste Percentage = max(0
    27.8 = 27.8%

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