Measure the height and length of the face of the brick to be exposed. For example, a standard clay brick is 2-5/8 inches high by 7-5/8 inches long in a traditional horizontal installation pattern. Adding 1/2 inch to each dimension for a common mortar joint between the bricks, the conventional dimension is defined as 3 by 8 to yield a 24-square-inch face area per brick.
Determine the wall coverage by dividing the brick face area into a square foot or, for the standard brick example, 144 square inches of a square foot divided by 24 square inches of brick face to equal six bricks per square foot.
Define the overall length and height of the proposed retaining wall. Multiply the two measurements to determine the overall square-foot area of wall surface.
Divide the wall area you calculated in Step 3 by the bricks per square foot defined in Step 2 to calculate the number of bricks needed for the retaining wall. For example, for a 30-inch-tall retaining wall that's 50 feet long, the wall surface area will be 2.5 feet times 50 feet equals 125 square feet of wall surface divided by six bricks per square foot to total 750 bricks required.
Things You Will Need
- Tape measure
- Sample bricks
- A minimum of 5 percent is typically added to the total brick quantity estimate to allow for cutting or breakage during construction.