Key Takeaways
- A brick’s footprint on the wall includes the mortar joint around it
- Bricks per square foot comes from brick size and joint width together
- Wall area times bricks per square foot gives the raw brick count
- Brick sizes and joint widths both vary by product and region
- A waste allowance covers breakage and cuts, not openings
A “bricks per square foot” rule of thumb only works if your bricks match the size the rule was written for. Brick dimensions and the mortar joint width around them both vary enough by product and region that the honest way to get a count is to work from the actual numbers, not a fixed figure someone else picked for a different brick.
The joint is part of the footprint, not an extra
A brick in a wall does not sit flush against its neighbors. It sits a mortar joint’s width away from them on every side, and that joint space is what actually determines how many bricks fit into a square foot of wall face. Add the joint width to both the brick’s length and its height to get its effective footprint, then divide 144 square inches by that footprint to get bricks per square foot. A standard brick around 8 by 2.25 inches with a 3/8 inch joint works out to roughly 6.9 bricks per square foot; a different brick size or a thicker joint shifts that number directly, which is why the joint dimension matters as much as the brick dimension.
Wall area drives the count from there
Wall length times wall height gives the total area to cover in square feet. Multiplying that area by the bricks-per-square-foot figure gives the raw brick count, and a waste allowance, typically around 10 percent, is added on top for breakage and job-site cuts. This is a single-wythe count for one flat wall face: it does not subtract door and window openings, and it does not account for a wall built more than one brick thick. Subtract the area of any openings from the wall dimensions before running the numbers, or calculate them separately and deduct their brick count, for an order that matches what actually gets laid.
Enter your wall dimensions and brick size into the brick calculator for an exact count based on your specific brick and joint, not a generic average. If the wall sits on a mortar bed that also needs sand, the sand calculator works out that volume separately, and for a brick veneer or a wall tied into a poured footing, the concrete calculator handles the concrete volume on its own.