Brick Calculator - How Many Bricks Do I Need?

Brick Calculator

Enter your wall or project dimensions, select a brick type, and get an instant estimate of bricks needed, mortar required, and cost.

Wall / Area Dimensions

Brick Type

Common Brick Sizes Reference

Dimensions shown are actual (not nominal). Nominal size includes the mortar joint.

*Bricks per square foot assumes 3/8" mortar joints. Actual counts vary with mortar thickness and technique.

How This Calculator Works

The brick calculator uses a straightforward area-based method:

Step 1: Calculate Wall Area

Wall Area = Length x Height

Step 2: Calculate Bricks Per Square Foot

Each brick's face area (including one mortar joint on each exposed edge) determines how many fit in a square foot:

Bricks/sq ft = 144 / [(Brick Length + Mortar) x (Brick Height + Mortar)]

The 144 comes from 12 x 12 = 144 square inches in one square foot.

Step 3: Total Bricks

Total = Wall Area x Bricks/sq ft x (1 + Waste%)

Step 4: Mortar Estimate

Mortar volume is estimated from the total mortar joint area times the wall depth (brick width). One 80 lb bag of premixed mortar covers approximately 0.15 cubic feet, enough for roughly 12-15 modular bricks.

Tips for Estimating Bricks

• Always round up -- you cannot buy half a brick, and running short mid-project is costly.
• Account for openings -- subtract the area of doors and windows from your total wall area before calculating.
• Waste factor matters -- use 5% for simple straight walls, 10% for projects with cuts or corners, and up to 15% for arches, curves, or decorative patterns.
• Order from one batch -- brick color can vary between manufacturing batches. Order all bricks at once when possible.
• Mortar type -- Type N is standard for above-grade walls, Type S for below-grade or load-bearing, Type M for foundation and retaining walls.
• Check local codes -- some jurisdictions require specific brick grades, mortar types, or reinforcement for structural walls.

Frequently Asked Questions

How many bricks do I need per square foot?

For standard modular bricks (3-5/8 x 2-1/4 x 7-5/8 inches) with 3/8-inch mortar joints, you need approximately 6.86 bricks per square foot. Larger bricks like king size require fewer per square foot (about 4.8), while smaller bricks need more. The exact count depends on your brick dimensions and mortar joint thickness.

How much mortar do I need per 1,000 bricks?

For standard modular bricks with 3/8-inch mortar joints, plan on approximately 7-8 bags (80 lb each) of premixed mortar per 1,000 bricks. Thicker mortar joints, larger bricks, or wasteful technique will increase this amount. Professional masons typically use slightly less than DIYers.

What is the best waste percentage to use?

Use 5% for simple, straight walls with minimal cuts. Use 10% for projects with corners, window and door openings, or moderate cutting. Use 15% for complex patterns, arches, or if you are a beginner. It is always better to have a few extra bricks than to run short.

What is the difference between nominal and actual brick size?

Nominal size includes the mortar joint. For example, a modular brick has a nominal size of 4 x 2-2/3 x 8 inches, but the actual brick measures 3-5/8 x 2-1/4 x 7-5/8 inches. The difference (3/8 inch on each dimension) is filled by the mortar joint. This calculator uses actual dimensions.

Can I use this calculator for patio or paver projects?

Yes. For patios laid flat (without mortar), set the mortar joint to 0 or a small gap value (e.g., 1/16 inch for sand joints). The "height" in this case is the length of the patio, and the calculator will give you the number of pavers needed for the surface area.

Does this calculator store my data?

No. All calculations run entirely in your browser. No data is sent to any server, and nothing is stored.

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Brick Calculator FAQ