In the building trade, the rule of thumb is to have 60 bricks for each square meter of surface. A typical brick measures 215 x 102.5 x 65mm. This is enough for one square meter of a "half brick" or "single brick" wall, where the bricks are laid horizontally. The width of the wall is the same as the width of the brick.
In a "one brick thick" or "double brick" wall, the width of the wall is equal to the length of the brick. For this type of wall, 120 bricks are needed for each square meter. To determine the total number of bricks needed, multiply the number of square meters by 60 for a single brick wall and 120 for a double thick wall. It is common to add 10 percent to this total in case of breakage.