How do I calculate square feet of a room for wallpaper
Measure the length and width of each wall, and then add up the resulting answers. So, if a wall is 9' tall and 12' wide, it is 108 sq feet. If another wall is 9' tall and 11' wide, it is 99 square feet. Your total would now be 99 + 108 or 207 square feet.
If you are doing it in feet and inches, you have to covert the inches to feet by dividing them by 12, since there are 12' in a foot. So with 3", divide 3 by 12 and get 0.25.
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