How to calculate rollage of wallpaper
To figure your wall area in square feet, measure the width of the walls and multiply by the height. Divide your total square footage by 50 to determine the number of double rolls you will need for your job. A standard roll of wallpaper covers approximately 56 square feet. The suggested divider of 50 square feet to determine the number of wallpaper rolls will allow for pattern waste in matching.
Example: A wall is 8′ high by 10’ long. 8’ X 10’ = 80’ sq. feet.,
80’ divided by 50 = 1.6, 1.6 rounded up = 2 double rolls.
A general rule of thumb is you can cut three 8’ pieces
and one 6’ piece from one double roll.