Brick Calculator: How Many Bricks Do I Need?

Planning a brick construction project begins with an important question: How many bricks do I need?

Whether you’re building a garden wall, decorative brick wall, masonry partition, exterior façade, or another brick structure, estimating the correct number of bricks helps you plan material purchases, compare supplier quotes, and reduce unnecessary waste.

A brick calculator estimates brick quantities based on wall dimensions, brick sizes, mortar joint thickness, and an appropriate waste allowance.

Our free Brick Calculator helps you estimate materials for common brickwork projects.

In this guide, you’ll learn how to calculate bricks per square foot or square meter, account for mortar joints, estimate bricks for walls of different sizes, and understand the factors that affect brick quantities.

What Is a Brick Calculator?

A brick calculator is a construction estimation tool that helps determine how many bricks are required for a wall or masonry project.

A typical calculation considers:

• Wall length
• Wall height
• Wall area
• Brick dimensions
• Mortar joint thickness
• Wall thickness or construction type
• Openings such as doors and windows
• Waste allowance

The final estimate is usually expressed as a whole number of bricks.

Some projects also require separate calculations for mortar, reinforcement, wall ties, and other construction materials.

How to Use the Brick Calculator

To estimate the number of bricks required:

1. Open the Multiconverts Brick Calculator.
2. Measure the wall length and height.
3. Enter the dimensions using consistent units.
4. Determine the brick size.
5. Account for mortar joints.
6. Subtract doors and windows where appropriate.
7. Calculate the estimated number of bricks.
8. Add an allowance for cuts, breakage, and construction waste.

For accurate results, confirm the actual dimensions of the bricks supplied for your project.

Brick Calculator Formula

For a single-layer wall where bricks are laid with their length and height visible on the wall face, the basic calculation is:

Number of Bricks = Wall Area ÷ Effective Face Area per Brick

The effective face area includes the brick’s visible dimensions and the mortar joint allowance.

Step 1: Calculate Wall Area

Wall Area = Wall Length × Wall Height

Step 2: Calculate Effective Brick Face Area

For a running-bond wall with consistent horizontal and vertical mortar joints:

Effective Brick Face Area = (Brick Length + Joint Thickness) × (Brick Height + Joint Thickness)

Step 3: Calculate the Brick Quantity

Bricks Needed = Wall Area ÷ Effective Brick Face Area

Step 4: Include a Waste Allowance

Total Bricks = Bricks Needed × (1 + Waste Percentage ÷ 100)

Round the final result up to a whole brick.

This simplified face-area method is appropriate for preliminary estimates of a single-wythe wall. Other bonds, wall thicknesses, and structural arrangements require different calculations.

Step-by-Step Brick Calculation Example

Suppose you’re building a wall with the following dimensions:

• Wall length: 20 feet
• Wall height: 8 feet
• Brick length: 7⅝ inches
• Brick height: 2¼ inches
• Mortar joints: ⅜ inch
• Waste allowance: 10%

These dimensions represent a common US modular brick face.

Step 1: Calculate Wall Area

20 × 8 = 160 ft²

Step 2: Calculate Effective Brick Dimensions

Effective length:

7⅝ + ⅜ = 8 inches

Effective height:

2¼ + ⅜ = 2⅝ inches

Step 3: Calculate Effective Face Area

8 × 2.625 = 21 in²

Convert to square feet:

21 ÷ 144 ≈ 0.145833 ft²

Step 4: Calculate the Number of Bricks

160 ÷ 0.145833 ≈ 1,097.14

Step 5: Include 10% Waste

1,097.14 × 1.10 ≈ 1,206.86

Round up:

Estimated quantity: 1,207 bricks

This is a planning estimate for a single-wythe wall with the specified dimensions and joint pattern.

How Many Bricks per Square Foot?

The number of bricks per square foot depends on brick size and mortar joint thickness.

For the US modular brick example above:

Effective face area = 21 in²

One square foot = 144 in²

144 ÷ 21 ≈ 6.857

Approximately 6.86 modular bricks per square foot

For quick estimates, this is often rounded to approximately 7 bricks per square foot.

The value changes when using different brick dimensions or joint thicknesses.

Brick Calculator Chart: Bricks per Square Foot

The following chart assumes:

• US modular brick face: 7⅝ × 2¼ inches
• Mortar joints: ⅜ inch
• Single-wythe wall
• Approximately 6.857 bricks per ft²
• No openings or waste allowance

Wall Area	Approximate Bricks
10 ft²	69
20 ft²	138
30 ft²	206
40 ft²	275
50 ft²	343
75 ft²	515
100 ft²	686
125 ft²	858
150 ft²	1,029
175 ft²	1,200
200 ft²	1,372
250 ft²	1,715
300 ft²	2,058
400 ft²	2,743
500 ft²	3,429
750 ft²	5,143
1,000 ft²	6,858

Quantities are rounded up to whole bricks. Actual requirements depend on brick size, bond pattern, and joint dimensions.

How Many Bricks per Square Meter?

For metric projects, the calculation follows the same principle.

Suppose a brick has the following face dimensions:

• Length: 215 mm
• Height: 65 mm
• Mortar joint: 10 mm

Effective dimensions:

225 mm × 75 mm

Effective face area:

225 × 75 = 16,875 mm²

One square meter contains 1,000,000 mm².

1,000,000 ÷ 16,875 ≈ 59.26

Approximately 59.26 bricks per square meter

For preliminary planning, this is often rounded to about 60 bricks per square meter.

Metric Brick Conversion Chart

The following table assumes a 215 × 65 mm brick face with 10 mm mortar joints in a single-wythe wall.

Wall Area	Approximate Bricks
1 m²	60
2 m²	119
3 m²	178
4 m²	238
5 m²	297
10 m²	593
15 m²	889
20 m²	1,186
25 m²	1,482
30 m²	1,778
40 m²	2,371
50 m²	2,963
75 m²	4,445
100 m²	5,926

Results are rounded up. This chart excludes waste allowances and openings.

How Many Bricks Do I Need for a 10 × 10 Foot Wall?

Suppose a wall measures:

• Length: 10 feet
• Height: 10 feet

Wall area:

10 × 10 = 100 ft²

Using 6.857 bricks per square foot:

100 × 6.857 ≈ 685.7

Round up:

686 bricks

With a 10% waste allowance:

685.7 × 1.10 ≈ 754.3

Estimated quantity: 755 bricks

The estimate assumes the same US modular brick dimensions and mortar joints used earlier.

How Many Bricks Do I Need for a 20 × 10 Foot Wall?

Wall dimensions:

20 × 10 = 200 ft²

Estimated bricks:

200 × 6.857 ≈ 1,371.4

With a 10% allowance:

1,371.4 × 1.10 ≈ 1,508.5

Estimated quantity: 1,509 bricks

This is a simplified single-wythe wall estimate.

How to Subtract Doors and Windows

When estimating brick quantities, subtract openings that do not require brickwork.

For example, suppose:

• Gross wall area: 200 ft²
• Door opening: 21 ft²
• Window opening: 16 ft²

Total openings:

21 + 16 = 37 ft²

Net wall area:

200 − 37 = 163 ft²

Using 6.857 bricks per square foot:

163 × 6.857 ≈ 1,117.7

With 10% waste:

1,117.7 × 1.10 ≈ 1,229.5

Estimated quantity: 1,230 bricks

Remember that arches, lintels, returns, and other details may affect the actual quantity.

Common Brick Sizes

Brick dimensions vary by country, manufacturer, and product type.

The following are examples of common brick dimensions.

Brick Type	Approximate Dimensions
US modular brick	7⅝ × 3⅝ × 2¼ in
US standard brick	8 × 3⅝ × 2¼ in
UK standard brick	215 × 102.5 × 65 mm
Example metric brick	190 × 90 × 90 mm

The face dimensions used in a wall depend on how the bricks are laid.

Always use the actual product dimensions when calculating quantities.

How Does Mortar Joint Thickness Affect Brick Quantity?

Mortar joints affect the effective dimensions of the masonry units.

Thicker joints increase the area occupied by each brick-and-joint module, reducing the theoretical number of bricks per square foot.

Thinner joints produce the opposite effect.

For a US modular brick face measuring 7⅝ × 2¼ inches:

Joint Thickness	Approximate Bricks per ft²
¼ inch	7.31
⅜ inch	6.86
½ inch	6.45

These values are theoretical estimates for a regular running-bond pattern.

Actual mortar joint dimensions should follow the project specifications and applicable construction requirements.

How Much Extra Brick Should I Order?

Brick projects often require additional material for:

• Cutting
• Breakage
• Handling damage
• Irregular wall shapes
• Openings and returns
• Pattern requirements
• Future repairs

A preliminary waste allowance may range from approximately 5% to 10% for relatively straightforward projects, while more complex work may require additional material.

For example, if the theoretical requirement is 1,000 bricks:

Waste Allowance	Total Bricks
0%	1,000
5%	1,050
8%	1,080
10%	1,100
12%	1,120
15%	1,150

These percentages are illustrative rather than universal requirements.

Brick Calculator for Garden Walls

Garden walls are common residential masonry projects.

Suppose a decorative garden wall measures:

• Length: 30 feet
• Height: 4 feet

Wall area:

30 × 4 = 120 ft²

Using approximately 6.857 modular bricks per square foot:

120 × 6.857 ≈ 822.9

With a 10% allowance:

822.9 × 1.10 ≈ 905.1

Estimated quantity: 906 bricks

This calculation estimates the facing area only.

A freestanding garden wall may require a different thickness, reinforcement, foundation, or structural design depending on height and local conditions.

Brick Calculator for Exterior Walls

Exterior walls may use brick veneer, cavity wall construction, or structural masonry.

A simple face-area calculator can estimate the brick quantity for one visible layer.

However, it does not automatically account for:

• Multiple masonry wythes
• Wall ties
• Reinforcement
• Structural supports
• Openings and lintels
• Corners and returns
• Special brick shapes

For structural projects, use the approved construction drawings and specifications.

How to Estimate Brick Cost

After calculating the number of bricks, estimate the material cost.

Brick Cost = Number of Bricks × Price per Brick

Example

Suppose you need 1,500 bricks and the supplier charges $0.75 per brick.

1,500 × $0.75 = $1,125

Estimated brick cost: $1,125

This does not include mortar, delivery, labor, reinforcement, scaffolding, or other construction expenses.

Example Project Cost Breakdown

Item	Hypothetical Cost
1,500 bricks at $0.75	$1,125
Mortar materials	$180
Delivery	$125
Other supplies	$120
Example material-related total	$1,550

These are illustrative prices, not current market quotations.

Brick vs Concrete Block

Bricks and concrete blocks are both used in masonry construction, but their dimensions and applications differ.

Characteristic	Brick	Concrete Block
Typical unit size	Smaller	Often larger
Quantity per wall area	Usually higher	Usually lower
Common applications	Veneer, walls, decorative masonry	Structural and partition walls
Mortar joints	Required in conventional masonry	Required in conventional masonry
Estimation method	Brick module and wall area	Block module and wall area

The appropriate material depends on the project design and specifications.

Square Feet to Square Meters Conversion

Brickwork areas may be measured in square feet or square meters.

1 ft² = 0.09290304 m²

1 m² ≈ 10.7639 ft²

Square Feet	Square Meters
50 ft²	4.65 m²
100 ft²	9.29 m²
150 ft²	13.94 m²
200 ft²	18.58 m²
250 ft²	23.23 m²
500 ft²	46.45 m²
750 ft²	69.68 m²
1,000 ft²	92.90 m²

For additional conversions, visit the Multiconverts Area Converter.

Common Brick Calculation Mistakes

1. Ignoring Mortar Joints

Mortar joints affect the effective size of each brick module.

2. Using the Wrong Brick Dimensions

Brick sizes vary by country and manufacturer.

3. Forgetting Doors and Windows

Openings should be accounted for when estimating wall area.

4. Ignoring Wall Thickness

A single-wythe calculation is not suitable for every wall construction type.

5. Forgetting Waste Allowance

Cutting and breakage can increase the quantity required.

6. Mixing Inches and Feet

Use consistent units throughout the calculation.

7. Assuming Every Brick Pattern Uses the Same Quantity

Different bond patterns and orientations can affect material requirements.

8. Using a Quantity Estimate as Structural Design

A brick calculator estimates materials. It does not determine structural safety, reinforcement, or foundation requirements.

Frequently Asked Questions About Brick Calculators

Conclusion

A brick calculator helps homeowners, contractors, and construction professionals estimate the number of bricks required for walls and masonry projects.

The basic formula is:

Bricks Needed = Net Wall Area ÷ Effective Brick Face Area

To include a waste allowance:

Total Bricks = Bricks Needed × (1 + Waste Percentage ÷ 100)

Remember to use the actual brick dimensions, account for mortar joints, subtract openings where appropriate, and consider the construction type.

For your next masonry project, try the free Multiconverts Brick Calculator to estimate material quantities and plan your work more efficiently.