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Brick Calculator for Walls, Fireplaces & Mortar Bags

Calculate bricks needed for walls and facades by brick style (modular, queen, king) with mortar and sand estimates.

Quick Answer:Standard modular brick walls require approximately 6.75 bricks per square foot of wall surface, plus a 10% cutting and breakage waste buffer.

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How to Use the Brick Calculator (Modular, Standard & Mortar)

1Enter the length and height of the brick wall in feet.
2Select your brick type (standard modular, queen, king, or utility).
3Enter opening deductions (doors or windows) if applicable.
4Review the total bricks needed, 80-lb mortar bags, and masonry sand tonnage.

Formula & How It Works

Brick Industry Association (BIA Technical Note 10)

Bricks = ⌈(L × H) × 6.75 × 1.10⌉

Wall Area = L × H - Openings. Bricks = Area × BricksPerSqFt × (1 + Waste). Mortar = Bricks / 110 (80-lb bags). Sand = Bricks / 1000 tons. Based on standard 3/8" mortar joints.

Worked Examples

20x8 ft Garden Retaining Wall (Modular Brick)

Input: 20' L × 8' H (160 sq ft), Standard Modular, 10% Waste

Explanation: 160 sq ft × 6.75 bricks/sq ft = 1,080 base bricks + 10% waste = 1,188 bricks.

Result: 1,188 bricks, ~11 bags mortar (80-lb), ~1.19 tons sand

Queen Size Brick Wall (100 sq ft)

Input: 10' L × 10' H (100 sq ft), Queen Size (5.4 bricks/sq ft)

Explanation: Queen bricks are larger, requiring only 5.4 bricks per sq ft instead of 6.75.

Result: 594 bricks, ~6 bags mortar

Fireplace Surround (6x5 ft)

Input: 6' L × 5' H (30 sq ft), Standard Modular

Explanation: 30 sq ft × 6.75 × 1.10 = 223 bricks.

Result: 223 bricks, ~3 bags mortar

Frequently Asked Questions

How many bricks are in a square foot?▼

Standard modular bricks require approximately 6.75 bricks per square foot with standard 3/8-inch mortar joints.

How much mortar do I need for 1,000 bricks?▼

You need approximately 9 to 10 bags (80 lbs each) of Type N masonry cement and about 1 ton of sand per 1,000 modular bricks.

What is standard mortar joint thickness?▼

Standard architectural mortar joint thickness in the United States is 3/8 inch (9.5 mm).

What type of mortar should I use?▼

Type N is standard for general above-grade exterior walls and chimneys; Type S is higher-strength for below-grade foundations and retaining walls.

How many bricks are in a cube/pallet?▼

A typical factory pallet (cube) contains approximately 500 to 530 modular bricks.

Is this calculation private?▼

Yes, your project dimensions remain 100% private in your local browser.

Quick Reference & Conversion Table

Brick Style	Nominal Dimensions (Inches)	Bricks / Sq Ft	Bricks for 100 Sq Ft (+10%)
Standard Modular	3⅝" × 2¼" × 7⅝"	6.75	743 bricks
Standard (Non-Modular)	3½" × 2¼" × 8"	6.55	721 bricks
Queen Size	2¾" × 2¾" × 9⅝"	5.40	594 bricks
King Size	2¾" × 2¾" × 9⅝"	4.80	528 bricks
Utility Brick	3⅝" × 3⅝" × 11⅝"	3.00	330 bricks

⚠️ Common Pitfalls to Avoid

•Failing to account for the 3/8-inch mortar joint when estimating brick face dimensions.
•Using standard Portland cement instead of flexible Type N or Type S masonry cement.
•Not adding 10% extra for chipped edges, half-brick corner cuts, and transport breakage.

💡 Practical Real-World Uses

•Exterior residential brick veneer cladding.
•Garden retaining walls and raised masonry planter boxes.
•Outdoor kitchens, brick barbecues, and chimney masonry repairs.

Modular Brick vs Queen Size Brick

✓Modular Brick: The historic architectural standard (6.75 per sq ft), requiring more mortar joints and higher labor hours.
✓Queen Brick: Larger face height and length (5.4 per sq ft), reducing total brick count by ~20% and speeding up mason installation times.

Last reviewed & updated: 2026-11-01

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