Brick Calculator
Whether you are building a garden wall, a retaining wall, or a decorative brick feature, this brick calculator estimates the number of bricks needed based on wall length, wall height, brick size, and mortar joint width. Two common US brick face sizes are offered: standard brick (8 x 2.25 inch face) and modular brick (7.625 x 2.25 inch face). The mortar joint defaults to 3/8 inch, which is the industry standard for residential brick work as specified by the Brick Industry Association. The calculator computes the face area of each brick including the mortar joint, divides the total wall face area by this to find the brick count, and applies a 5% waste factor. This factor accounts for brick broken during transit, cutting at wall ends, and spoilage. For walls with many corners, curves, or openings, use 7 to 10% waste instead. This calculator estimates bricks for a single-wythe (one-brick-thick) wall. For double-wythe or cavity walls, multiply the result by the number of wythes and add ties and insulation as required. Always order bricks from the same kiln run to ensure consistent colour. Brick Industry Association Technical Notes provide detailed guidance on mortar types, joint profiles, and structural requirements for various wall types.
Brick calculation formula
Wall area (sq in) = Length (ft) x Height (ft) x 144
Brick face area = (Brick length + Mortar joint) x (Brick height + Mortar joint)
Bricks (no waste) = ceil(Wall area / Brick face area)
Bricks with waste = ceil(Bricks x (1 + Waste% / 100))
Standard US brick dimensions (Brick Industry Association)
| Brick type | Length (in) | Height (in) | Depth (in) |
|---|---|---|---|
| Standard | 8.00 | 2.25 | 3.75 |
| Modular | 7.625 | 2.25 | 3.625 |
Brick calculator: frequently asked questions
How many bricks do I need per square foot of wall?
For standard US brick (8 x 2.25 x 3.75 inches nominal) with a 3/8-inch mortar joint, approximately 6.75 bricks are needed per square foot of wall face. For modular brick (7.625 x 2.25 x 3.625 inches) with a 3/8-inch joint, approximately 6.86 bricks are needed per square foot. This calculator computes the exact count based on your chosen brick size and mortar joint width.
What is the standard mortar joint width for brick?
The standard mortar joint for residential brick work is 3/8 inch (approximately 9.5 mm). This is the most common joint width used in the US and is specified in ASTM C270 for mortar and the Brick Industry Association Technical Notes. Thicker joints (1/2 inch) are used in some heavy construction or with irregularly sized brick. Thin joints (1/4 inch) are used for precision-cut face brick.
What is the difference between standard and modular brick?
Standard US brick has a nominal size of 8 x 2.25 x 3.75 inches (actual dimensions may vary slightly). Modular brick (also called Norman or Standard Modular) has a nominal face size of 7.625 x 2.25 inches and is designed to lay in courses that align with 4-inch or 8-inch height increments when combined with a 3/8-inch mortar joint. Modular brick is very common in modern construction. Both sizes are available at most masonry suppliers.
How much mortar do I need for brick work?
A general rule is approximately 6 to 7 cubic feet of mortar per 1,000 bricks for a standard single-wythe wall with 3/8-inch joints. Pre-bagged mortar mix (typically sold in 60 lb or 80 lb bags) yields approximately 0.45 to 0.60 cubic feet per bag when mixed. For a 1,000-brick wall, you would need roughly 10 to 15 bags of premix mortar. Always mix only as much as you can use in 1 to 2 hours.
Should I add extra bricks for waste?
Yes. A 5% waste allowance is standard for simple rectangular walls. For walls with many openings, corners, or complex patterns, use 7 to 10%. Brick can break during delivery, handling, and cutting. Keeping a small quantity of extra brick from the same firing lot is also advisable for future repairs, as brick colour and texture can vary between production runs.
Sources
- Brick Industry Association Technical Notes on Brick Construction: gobrick.com.
- ASTM C270 Mortar for Unit Masonry standard: astm.org.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology. Consult a licensed mason for structural walls.