The square footage of a wall is the length of the wall (in feet) times the height of the wall (in feet). The square footage of a room is the sum of the square footage of all of the walls in the room.

Example

One wall is 10 feet long, another is 2 feet 4 inches long, and the room has a ceiling that is 100 inches high.

total area = (10 ft)*(100/12 ft) + (2 4/12 ft)*(100/12 ft)

= (10 ft + 2 4/12 ft)*(100/12 ft) = (10 + 2.33)*(8.33) ft

= 12.33*8.33 ft

The areas of doors and windows may need to be subtracted. The area of those features is computed the same way: (length in feet)*(height in feet)

It is a good idea to talk to your wallpaper supplier about how to do these calculations. Special conditions can have a significant effect on the amount of paper you need, including roll length, pattern repeat length, and roll width. The locations of corners or other features with respect to the width of the roll may result in a certain amount of "waste."

Example

One wall is 10 feet long, another is 2 feet 4 inches long, and the room has a ceiling that is 100 inches high.

total area = (10 ft)*(100/12 ft) + (2 4/12 ft)*(100/12 ft)

= (10 ft + 2 4/12 ft)*(100/12 ft) = (10 + 2.33)*(8.33) ft

^{2}= 12.33*8.33 ft

^{2}= 102.78 ft^{2}The areas of doors and windows may need to be subtracted. The area of those features is computed the same way: (length in feet)*(height in feet)

It is a good idea to talk to your wallpaper supplier about how to do these calculations. Special conditions can have a significant effect on the amount of paper you need, including roll length, pattern repeat length, and roll width. The locations of corners or other features with respect to the width of the roll may result in a certain amount of "waste."