Brick Calculator — How Many Bricks Do I Need?

How to Calculate Bricks for a Wall

The number of bricks needed depends on the wall area and the face size of each brick including its mortar joint. The basic formula for a single-wythe (one brick thick) wall is:

Bricks = Wall Area ÷ (Brick Face Area incl. mortar joint)

A standard modular brick measures 7⅝ × 2¼ inches face, and with a standard 3/8-inch mortar joint it covers approximately 0.148 sq ft. That works out to roughly 6.75 bricks per square foot of single-wythe wall.

Always add a waste allowance of at least 10% to cover cuts at corners, window and door openings, and any breakage during handling. For complex patterns like herringbone or diagonal layouts, increase the waste allowance to 15–20%.

Common Brick Sizes & Coverage Rates

• Standard / Modular (7⅝×2¼ in): ~6.75 bricks per sq ft
• Queen (9⅝×2¾ in): ~5.5 bricks per sq ft
• King (9⅝×2¾ in): ~4.8 bricks per sq ft
• Engineer (7⅝×2¾ in): ~5.9 bricks per sq ft

Brick sizes vary by manufacturer and region. Always confirm the actual face dimensions with your supplier before placing a large order.

Mortar and Material Estimating Tips

Bricks alone are not enough — you also need to estimate mortar, ties and any reinforcement. A rough guide for mortar:

• Standard bricklaying uses approximately 0.0035 cubic feet of mortar per brick
• One 80 lb bag of mortar mix yields about 0.5 cubic feet of mixed mortar
• A 1,000-brick job requires roughly 7 bags of mortar

For double-wythe or cavity walls, multiply the single-wythe brick count by the number of wythes. Deduct the area of all doors and windows before calculating.

Frequently Asked Questions