Brick Calculator

Use our free brick calculator to determine exactly how many bricks you need for a wall, veneer, or masonry project. Designed for contractors, masons, and homeowners, this tool converts your wall dimensions, brick size, and mortar joint thickness into a total brick count, including a waste allowance.

How to use this calculator.

Enter wall dimensions. Input the wall length and height in feet.
Enter brick dimensions. Input your brick length and height in inches. The default (7.5 × 2.25 in) is standard modular brick.
Set the mortar joint thickness. Standard joints run 3/8 to 1/2 inch (0.375-0.5 in).
Set your waste percentage. The default is 5%; raise it for complex layouts.
Review your results. The calculator displays wall area and total bricks needed instantly.

How do you calculate A brick calculator helps you determine exactly how many bricks you need for a wall project. It accounts for wall dimensions, brick size, mortar joint thickness, and material waste.?

The number of bricks is found by dividing the total wall area by the area each brick occupies including its mortar joint, then adding a waste percentage for cuts and breakage.

Wall Area (sq ft) = Wall Length (ft) × Wall Height (ft)

Bricks Needed = Wall Area (sq in) ÷ [(Brick Length + Mortar Joint) × (Brick Height + Mortar Joint)] × (1 + Waste ÷ 100)

Where:

Wall length and height: The dimensions of the wall surface, in feet.
Brick length and height: The face dimensions of a single brick, in inches.
Mortar joint: The thickness of the mortar bed around each brick, in inches. This gap is added to both brick dimensions since it appears on every side.
Waste: The percentage added for cut bricks, breakage, and corners. 5% is standard for straightforward walls.

Example calculation.

Let's estimate bricks for a garden wall using standard modular bricks.

Scenario: A wall 20 ft long and 8 ft high, using standard modular bricks (7.5 × 2.25 in) with 0.4-inch mortar joints and a 5% waste factor.

Calculate wall area: 20 ft × 8 ft = 160 sq ft
Convert to square inches: 160 × 144 = 23,040 sq in
Calculate brick coverage per unit: (7.5 + 0.4) × (2.25 + 0.4) = 7.9 × 2.65 = 20.94 sq in
Divide to get bricks without waste: 23,040 ÷ 20.94 = 1,100.5 bricks
Apply 5% waste: 1,100.5 × 1.05 = 1,155.6 bricks

Result: Order approximately 1,156 bricks for this 160 sq ft garden wall.

Tips from the field.

Measure precisely. Even a 6-inch error in wall length can throw off your brick count by dozens of units. Measure twice before ordering.
Standard mortar joints are 3/8 to 1/2 inch. Thicker joints mean fewer bricks per square foot but can weaken the wall. Stay within industry standards for structural work.
Increase waste for complex layouts. Walls with arches, corners, or intricate patterns typically need 10-15% waste instead of the standard 5%.
Order from the same batch. Bricks from different production runs can vary slightly in color. Order the full quantity at once from a single lot.
Budget separately for mortar. A typical 8-inch brick wall uses about 7-8 bags of mortar mix per 1,000 bricks, depending on joint thickness.
Subtract openings before ordering. Deduct the area of windows, doors, and other large openings from the wall area first, so you don't buy bricks you won't lay.

Disclaimer: Calculations are estimates. Brick sizes, mortar joint dimensions, and actual waste rates vary by project conditions. Always consult a professional mason for critical structural walls. Verify all calculations independently before purchasing materials or starting construction.

Cost, price, and density figures on this page reflect approximate U.S. averages as of August 2026 and vary by region, supplier, and material availability.

Frequently asked questions.

How many bricks do I need for a 100 sq ft wall?

For a standard modular brick (7.5×2.25 inches) with 3/8-inch mortar joints and 5% waste, you need approximately 680 bricks per 100 sq ft. Each brick with mortar covers about 0.147 sq ft. Use our calculator for your exact brick size and dimensions.

How many bricks do I need for a 1200 sq ft house?

A 1,200 sq ft house typically needs 8,000-12,000 bricks for exterior walls depending on wall height, window/door openings, and brick size. Standard 8-foot walls on a 30×40 ft footprint = ~1,120 sq ft of wall area × ~7 bricks per sq ft = ~7,800 bricks. Add 5-10% for waste.

Why do I need to account for waste in brick calculations?

Waste accounts for bricks that are cut, broken, or otherwise unusable during construction. A waste factor of 5-10% is standard. For complex patterns, arches, or lots of corners, use 10-15% waste. Always order extra: matching brick color from different batches is difficult.

Does mortar joint thickness affect the number of bricks?

Yes: standard mortar joints are 3/8 to 1/2 inch. Thicker joints (1/2 inch) mean fewer bricks per square foot. Thinner joints (1/4 inch) require more bricks but provide a cleaner look. The difference can be 50+ bricks per 100 sq ft of wall.

How many bricks do I need for a fire pit?

A typical 36-inch diameter fire pit with 12-inch high walls needs about 150-200 standard bricks. Use firebrick for the inner lining (rated for high heat) and standard brick or paver brick for the exterior. Always use refractory mortar for the firebrick layer.

How much does a brick wall cost?

Brick walls cost $25-$45 per square foot installed including materials, mortar, labor, and footing. Brick veneer costs $10-$20 per sq ft. Materials alone: bricks average $0.50-$1.00 each. A 20×8 ft wall (160 sq ft, ~1,100 bricks) costs $4,000-$7,200 installed.