Use this handy calculator to measure how many rolls of wallpaper you'll need to complete your home improvement project.
To estimate the amount of standard American wallpaper you'll need, first add up the lengths of all walls to get the distance around the room and enter this figure as the perimeter of the room. Round off to the nearest foot. Next, enter the number of single doors (about 20 square feet), the number of double doors (about 40 square feet), small windows (10 square feet) and large windows (25 square feet). Also enter the square footage of any other openings or areas not to be wallpapered -- such as a fireplace.
Next enter the size of the roll of the paper you're using in square feet, and click on "calculate." The calculator will tell you how many rolls of that size are needed. A standard American roll of wallpaper gives you about 35 square feet, but waste and pattern matching usually takes this down to about 27 usable square feet per roll.
Allow for 5% more material for waste. This is an estimate only.
Two wallpapering tips: