The number of brick required per square foot is based on the size of the brick. The larger the brick the fewer the brick required. To determine the number for a wall area, measure the area (Height x Length) of the wall to be covered. To determine how many- thin brick are needed multiply the wall area by the number of brick per square foot. For example: If the height of the wall is 10 feet and its length is 20 feet, the area of the wall is 200 square feet. About seven modular thin brick are needed to cover a square foot, so 200 square feet X 7 thin brick per square foot = 1,400 thin brick to cover the wall. Remember, there will be some losses because of cutting and damage, so order extra thin brick (most installers assume 5% waste).