A single roll measures 27 inches by 5 yards (68 cm by 4.5 meters). Depending upon the stock, an order of over one roll may be shipped as uncut double or triple rolls.
How to Measure
Aimee recommends measuring with a yardstick or steel tape measure. Make your measurements in feet and round off to the next half-foot or foot. Measure the wall height from the floor to the ceiling, excluding any baseboards or moldings. Then measure the length of the wall without deducting for windows or doors (this will leave you extra wallpaper in case you may need it). Multiply the two measurements to find the surface area of the wall.
Single rolls of Aimee's wallpaper are 15 feet long, but widths vary from 27-28 inches. 1 roll covers about 30 square feet. To find the number of rolls needed to cover your wall, multiply the height and the width of the wall by rounding up each length to the nearest foot. Then divide by 30.
Example: For a wall that is 10 feet 6 inches high by 9 feet 4 inches long. Round up and multiply 11 feet by 10 feet to get 110 square feet. Divide 110 by 30 and you will get 3.6. In this case you will need 5 rolls.
If the number divides out to be .5 or above, you will need to add one more roll on to be safe. If you were to get 3.4, 4 rolls would be enough, but if you get 3.5 to 4.4, you will need 5 rolls.
How to Hang
Aimee recommends that a professional experienced in paper hanging install all wallpaper as she cannot be held responsible for improperly hung paper. Please note that Mylar papers can be scratched or dulled by wallpaper smoothing tools. To avoid damage, wrap tools in chamois, lubricate tools with glue, or smooth paper by hand.
For more ideas check out brilliant wallpaper transformations