What is a standard US brick dimension?

A standard red clay facing brick in the United States measures 8 inches long, 2.25 inches high, and 3.75 inches deep. When laid, a 3/8-inch (0.375") mortar joint is universally applied.

How much mortar do I need per 100 bricks?

As a standard rule, a single 80-pound bag of dry pre-blended mortar mix (Type N or Type S) will lay approximately 30 to 35 standard bricks. Therefore, 100 bricks require roughly 3 bags of mortar.

What is the difference between single course and double course brick walls?

A single course (single wythe) is one brick course thick, commonly used as decorative siding or light garden walls. A double course (double wythe) is two bricks thick, bound together internally for superior structural load bearing.

Construction Tool

Brick Calculator

Calculate the number of bricks and bags of mortar mix required for a single or double-course brick wall of any size.

Interactive Brick Calculator Workspace

Live Solver

Wall Length (Feet)

Wall Height (Feet)

Brick Size / Type

Mortar Joint Thickness (Inches)

Wall Depth Structure

Waste Buffer (%)

Brick Masonry Totals

Wall Surface Area80.0 sq ftbase facade face

Single Brick Coverage0.153 sq ftincl. mortar joint

Total Bricks Required577 Bricksincl. 10% waste margin

Mortar Bags Needed18 Bags80lb dry pre-mix bags

Mathematical Formula & Variables

Equation ModelBricks Needed = (Wall Area / Brick Facing Area with Joint) × Layers × (1 + Waste % / 100)

The brick formula takes the total surface area of the wall (Length × Height) and subtracts openings for doors or windows. It then divides this by the facing area of a single brick, which must include the thickness of the mortar joint (typically 3/8" or 0.375"). Multiply by layers (1 for single-wythe, 2 for double-wythe brick walls).

Variable Definitions

Symbol	Description
Bricks Needed	Total number of standard bricks to purchase
Wall Area	Total surface area of the wall (Length × Height) minus openings in square feet
Brick Facing Area	(Brick Length + Joint Thickness) × (Brick Height + Joint Thickness) in square inches
Layers	Number of vertical courses deep (1 for single wall, 2 for a thick structural wall)
Waste %	Allowance for brick cutting and breakage (typically 10% is standard)

How to Use the Brick Calculator

Input the overall Length and Height of the brick wall you are building.
Select your brick size (Standard US, Modular, Roman, or enter a custom dimensions).
Choose your planned mortar joint thickness (typically 3/8" or 10mm).
Select wall structure type (Single course/wythe veneer vs double course load-bearing).
Input the safety margin percentage to compensate for cracked bricks and corner cuts.
Review the output to see total bricks needed and estimated bags of pre-mixed mortar required.

Practical Example Calculation

Scenario Context: Building a single-wythe garden brick wall that is 20 feet long and 4 feet high using standard US bricks (8" × 2.25") with a 3/8" (0.375") mortar joint and a 10% waste buffer.

Step 1: Calculate wall area: 20 ft × 4 ft = 80 square feet (11,520 square inches).

Step 2: Calculate nominal brick dimensions with joint: Length = 8 + 0.375 = 8.375", Height = 2.25 + 0.375 = 2.625".

Step 3: Calculate individual brick nominal facing area: 8.375 × 2.625 = 21.98 square inches.

Step 4: Calculate base bricks needed: 11,520 sq in / 21.98 sq in = 524 bricks.

Step 5: Apply 10% safety buffer: 524 × 1.10 = 576.4 bricks.

The garden wall requires approximately 577 standard bricks, along with about 19 bags (80lb) of pre-blended mortar mix.

Frequently Asked Questions

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