How to Calculate How Many Bricks You Need
I built this brick calculator to take the guesswork out of ordering materials for masonry projects. Whether you're building a garden wall, a retaining wall, or the exterior of a home, getting your brick count right before heading to the supplier saves time, money, and frustration. The core formula is straightforward: divide the total wall area by the face area of a single brick, then add a waste factor to cover cuts, breakages, and irregular edges.
Standard modular bricks in the US measure 7⅝" × 3⅝" × 2¼" with a ⅜" mortar joint, giving a nominal face size of 8" × 2⅔". In metric countries a standard brick is typically 215 mm × 102.5 mm × 65 mm with a 10 mm joint. Always check the actual face dimensions of the brick you've chosen — decorative or reclaimed bricks vary widely and can change your count by 10–20%.
Account for Mortar Joints and Waste
Mortar joints matter more than most people expect. A ½" joint instead of a ⅜" joint adds roughly 6% to the face area of each brick unit, which means you'll need fewer bricks but more mortar. For waste, use these benchmarks:
- Straight, simple walls: 5% waste is typically sufficient.
- Walls with corners, curves, or openings: 10% waste is a safer margin.
- Complex patterns (herringbone, diagonal): allow 15–20% waste for cuts.
- Reclaimed or handmade bricks: add an extra 5% for higher breakage rates.
Tips for Ordering Bricks
Once you have your estimated count, I recommend ordering from a single batch (same kiln run) to keep colour and texture consistent. Brick colour can vary noticeably between production runs, and mixing batches on a visible wall is a common and costly mistake. Ask your supplier for a batch number and confirm they have enough stock before you commit.
Don't forget to factor in the mortar itself. A rough rule is that you'll use about one cubic foot of mortar mix for every 35–40 standard bricks. Pre-mixed bags make small jobs easy, but for projects over 500 bricks it's usually more cost-effective to mix your own with Portland cement, sand, and water.
Frequently Asked Questions
How many bricks are in a standard pallet?
Most suppliers sell standard modular bricks on pallets of 500 to 525 bricks. Larger format blocks (such as 8" CMU blocks) come in pallet quantities of 72–108 units. Always confirm with your local supplier because pallet sizes vary by region and brick type. Buying by the pallet is usually cheaper per unit than buying loose, so it's worth rounding up to the nearest full pallet if you're close.
Do I need to account for openings like doors and windows?
Yes — subtract the area of any doors, windows, or other openings from your total wall area before calculating brick count. However, don't reduce your waste percentage just because you have openings; the cuts around window reveals and door frames actually generate more waste than straight runs, so keep your waste factor at 10% or higher when openings are involved.
What is a running bond vs. a stack bond pattern?
A running bond (each course offset by half a brick) is the most common and structurally sound pattern — it distributes load well and uses bricks efficiently. A stack bond (bricks stacked directly on top of each other) is used for aesthetic effect but is weaker and typically requires steel reinforcement. The brick count per square foot is the same for both patterns, but stack bond generates more precise cuts and therefore more waste.