There are many ways of calculating the number of wallpaper rolls required for a particular project. Depending on which method is used, the end result may vary. For the Love of Wallpaper™ is not responsible for the accuracy of the final number. To ensure you have sufficient product for your project and to also have product on hand for possible future usage, we recommend purchasing an additional double roll of wallpaper above what the Calculator formula suggests. This formula is short and simple but does not account for the specific width of the wallpaper pattern, the size of pattern repeats or the size of window/door openings or other special room conditions. As a generalization, the larger the repeat the more wallpaper rolls are needed and the larger the windows and doors, the fewer wallpaper rolls are needed.
Simple Quantity Calculation Formula:
- Take the total room square footage (take dimensions of room x height of room) and divide by 24.
- Deduct 2 single wallpaper rolls for up to every 4 standard size openings (windows or doors).
Example:10x12 room with an 8' ceiling, 2 windows and 1 door:
Deduct 2 rolls for the 3 openings=12.7 or 13 rolls. But, since wallpaper is packaged in double rolls, the final number of rolls would be 14 single rolls or 7 double rolls.
Simplest Quantity Calculation Chart:
Calculate the square footage by adding the room dimensions and multiplying by the room height (in feet). It is important to add the dimensions together--for example for a 10' x 12' room, add 10+10+12+12 = 44--rather than just multiplying 10x 12 which would give you the square footage of only the ceiling or the floor but not the actual wall space. A 10' x 12' room with a standard 8' ceiling contains 10+ 10+ 12+ 12 =44 x 8 = 352 square feet. Other factors to consider are pattern repeat and large room openings--doors/windows, etc. It is always best to order more material (at least 1 additional double roll) than you actually think you will need in order to ensure you have sufficient material of the same dye lot and to provide 'attic stock' for possible future uses or repairs. The following chart is intended as a guide only. In developing the categories, we have built in some 'extra' variance. For the most accurate calculation based on your specific room configuration and the precise wallcovering pattern selected, it is recommended to get the input of a wallcovering installation professional.
For larger room sizes, divide the total square footage by 50 to determine the number of rolls needed. Note that in this chart, a room of 352 square feet would require 8 double rolls, but in the Simple Calculator Formula at the top of the page, the requirement for a 352 square foot room would be 7 double rolls. The difference is that in the top example, windows and doors were deducted. Remember, whatever calculator is used, it only provides an estimate, not an exact number.