Construction & Materials

Brick Calculator

Calculate the exact number of bricks and mortar bags required for a wall or brick paving project. Accounts for modular, queen, and utility sizes.

Formula Verified & Maintained by:Elena Rostova, P.E.

P.E., M.S. Civil Engineering (Georgia Tech) • Senior Construction Estimator & Materials Engineer

Peer-Reviewed AlgorithmAudited for 2026 Rules

Interactive Calculator

1. Provide Details

Wall Length (ft)

Wall Height (ft)

Brick Size & Type

Waste Factor (%)

2. Output Results

Total Wall Area160.0 sq ft

Base Bricks Needed1048 bricks

Total Bricks (+ Waste)1153 bricks

80 lb Mortar Bags Needed39 bags

How to Calculate: Formula & Steps

Finds the total wall surface area in square feet, multiplies by standard brick layout densities, and appends a materials waste margin.

Formula Used:Total Bricks = Wall Area × Bricks per Sq Ft × (1 + Waste %)

Step-by-Step Calculation Example

A 20ft long, 8ft tall wall (160 sq ft) using standard modular bricks (6.55/sq ft) requires 1,048 bricks. Adding 10% waste results in 1,153 bricks.

Common Mistakes to Avoid

Forgetting to add a waste buffer (10% is standard) for corners, half-cuts, and breakage.

Practical Use Cases

Building brick walls or retaining structures
Laying brick patios or garden paths

Expert Tips

Order all bricks at once to ensure consistent color matching across the entire shipment.

Masonry Estimations: Brick Densities, Mortar Bags & Waste Factors

Estimating facing brick quantities and Type N or Type S mortar bags for brick walls, veneer cladding, or garden retaining structures requires calculating net wall surface area in square feet and applying the appropriate brick size multiplier with a 3/8" standard mortar joint.

The Masonry Material Equations

Total Bricks = (Wall Length in ft × Wall Height in ft) × Bricks per Sq Ft × (1 + Waste %)

80 lb Mortar Bags Required = Total Bricks ÷ 30

Standard Brick Sizes & Square Foot Densities

Brick Format	Nominal Dimensions (D × H × L)	Bricks per Sq Ft	Common Application
Standard Modular	3⅝" × 2¼" × 7⅝"	6.55 bricks / sq ft	Residential home veneer cladding.
Queen Size	3" × 2¾" × 7⅝"	5.20 bricks / sq ft	Faster laying times; economical residential.
Utility Brick	3⅝" × 3⅝" × 11⅝"	3.00 bricks / sq ft	Commercial structures & retaining walls.

Disclaimer

This calculation tool is provided for educational and informational estimation purposes only. Results are based on mathematical formulas and user-supplied parameters. They do not constitute formal underwriting, financial, tax, engineering, or legal determinations.

Frequently Asked Questions About Brick Calculator

How many bricks are in a square foot?

Standard modular brick layouts require approximately 6.55 bricks per square foot with standard 3/8" mortar joints. Queen size requires ~5.2, and utility size requires ~3.0.

How much mortar do I need?

One standard 80 lb bag of mortar mix is typically required to lay about 30 modular bricks.