Page Contents
Introduction
Calculating the number of bricks required for a wall is an important part of construction estimation. The Brick Quantity Calculator estimates the number of bricks required using the wall dimensions, actual brick dimensions, mortar-joint thickness, door and window openings, and brick wastage allowance entered by the user.
For a reliable estimate, enter the wall length, height and thickness from the latest approved drawings. Enter the actual length, width and height of the brick being used at the site, excluding the mortar joint. Brick dimensions can vary depending on the type of brick, manufacturer and local availability.
The calculator deducts the entered door and window openings from the gross wall volume. It then adds the entered mortar-joint thickness to the actual brick dimensions to determine the effective volume occupied by one brick.
In India, wall thicknesses of approximately 115 mm (0.115 m) and 230 mm (0.230 m) are commonly used. However, users should enter the actual wall thickness specified in the project drawings.
This calculator is useful for civil engineers, contractors, quantity surveyors, site supervisors, students and homeowners involved in construction and renovation work.
Use the Brick Quantity Calculator
Use the calculator below to estimate the required quantity of bricks for your wall.
Important input note: Enter the actual brick length, width and height without the mortar allowance. Enter the mortar-joint thickness separately. Do not enter nominal brick dimensions that already include mortar and then add the mortar joint again.
Brick Quantity Calculator
Enter the number and dimensions of doors and windows. Their volume will be deducted from the gross wall volume before calculating the brick quantity.
Door OpeningWindow Opening
View Calculation Details & Formula
The calculator deducts the entered door and window openings before calculating the required number of bricks.
The mortar joint allowance is incorporated into the effective modular brick dimensions for this quantity estimation.
Important: Actual brick consumption can vary depending on brick dimensions, mortar joint thickness, workmanship, wall configuration, breakage, cutting and site conditions.
What Is Brick Quantity Calculation?
Brick quantity calculation is the process of estimating the number of bricks required to construct a wall or other brick masonry work.
The quantity depends mainly on:
- Length of the wall
- Height of the wall
- Thickness of the wall
- Brick dimensions
- Mortar joint thickness
- Door and window openings
- Construction wastage
Accurate brick quantity estimation helps in material procurement, cost estimation, construction planning and reduction of material wastage.
Standard Brick Size in India
A commonly used modular brick size in India is:
| Description | Size |
|---|---|
| Actual modular brick size | 190 × 90 × 90 mm |
| Nominal size including mortar | 200 × 100 × 100 mm |
The nominal size includes the approximate mortar joint allowance.
For actual construction work, always verify the brick dimensions supplied by the manufacturer or supplier because brick sizes can vary.
How to Calculate the Number of Bricks Required?
The number of bricks can be estimated by dividing the volume of brickwork by the nominal volume occupied by one brick, including the mortar joint allowance.
Formula
Number of Bricks = Brickwork Volume ÷ Nominal Volume of One Brick
Where:
Brickwork Volume = Length × Height × Wall Thickness
For estimation using nominal brick dimensions:
Nominal Brick Volume = Nominal Length × Nominal Width × Nominal Height
For example, when a nominal brick size of 200 × 100 × 100 mm is used:
Nominal Brick Volume = 0.20 × 0.10 × 0.10
= 0.002 m³
Therefore:
Bricks Required = Brickwork Volume ÷ 0.002
This method provides an approximate quantity. Actual brick consumption may vary depending on brick dimensions, mortar joints, workmanship and site conditions.
Brick Quantity Calculation Example
Let's calculate the number of bricks required for a wall.
Given Data
- Wall length = 12 m
- Wall height = 3 m
- Wall thickness = 230 mm = 0.23 m
- Nominal brick size = 200 × 100 × 100 mm
Step 1: Calculate Wall Volume
Wall Volume = Length × Height × Thickness
= 12 × 3 × 0.23
= 8.28 m³
Therefore, the brickwork volume is 8.28 m³.
Step 2: Calculate Nominal Brick Volume
Nominal brick size:
200 × 100 × 100 mm
= 0.20 × 0.10 × 0.10 m
Nominal brick volume = 0.002 m³
Step 3: Calculate Number of Bricks
Number of Bricks = Wall Volume ÷ Nominal Brick Volume
= 8.28 ÷ 0.002
= 4,140 bricks
Therefore, approximately 4,140 bricks are required before allowing for wastage.
Estimation note: This example uses the commonly adopted 230 mm wall thickness and a nominal modular brick volume of 0.002 m³, equivalent to approximately 500 bricks per cubic metre of brickwork. It is a preliminary volumetric estimate. Actual consumption should be verified using the brick dimensions, mortar-joint thickness, masonry bond and wall thickness adopted for the project.
Step 4: Add Brick Wastage
Assuming 5% wastage:
Wastage = 4,140 × 5/100
= 207 bricks
Therefore:
Total Bricks = 4,140 + 207
= 4,347 bricks
So, approximately 4,347 bricks, including 5% wastage, are required for this example.
Brick Wastage in Construction
Some bricks may break or become unsuitable during transportation, storage, handling, cutting and masonry work.
For preliminary estimation, a wastage allowance may be considered depending on project conditions.
The wastage allowance should be selected according to brick quality, transportation, unloading, storage, handling, cutting requirements, masonry bond and actual site conditions. The 5% wastage used in the worked example is illustrative only and should not be treated as a universal value.
The actual wastage should be determined based on project conditions and site practices.
Mortar Quantity for Brickwork
Mortar fills the horizontal and vertical joints between bricks and binds the masonry units together.
For preliminary site estimation, approximately 0.25 to 0.30 m³ of wet mortar per 1 m³ of brickwork may be considered when project-specific consumption data are unavailable.
The appropriate mortar factor depends on the actual brick dimensions, mortar-joint thickness, brick shape and surface irregularity, masonry workmanship and site conditions. Therefore, this range should be treated as a practical estimation guideline and not as a universal fixed value.
Approximate Mortar Quantity Formula
Approximate Wet Mortar Volume = Brickwork Volume × Mortar Factor
For the worked example:
- Brickwork volume = 8.28 m³
- Practical mortar factor = 0.25 to 0.30
Lower Estimate
Wet Mortar Volume = 8.28 × 0.25
= 2.070 m³
Upper Estimate
Wet Mortar Volume = 8.28 × 0.30
= 2.484 m³
Therefore, the approximate wet mortar requirement is:
2.070 to 2.484 m³
The appropriate value within this range should be selected according to the actual brick dimensions, mortar-joint thickness, masonry workmanship and site conditions.
Important: This is an approximate wet mortar volume. To calculate cement and sand quantities, the wet mortar volume must be converted into the corresponding dry-material volume using the mortar mix proportion and dry-volume conversion method adopted for the project.
Calculator note: The Brick Quantity Calculator above calculates the number of bricks only. Mortar quantity must be estimated separately.
For concrete quantity estimation, use our Cement, Sand & Aggregate Calculator to estimate cement, sand and aggregate for nominal concrete mixes.
Factors Affecting Brick Quantity
1. Wall Dimensions
Wall dimensions have a major impact on the quantity of bricks. A larger wall requires more bricks because the total volume of masonry increases with greater length, height, and thickness.
For example:
A wall with dimensions of 10 m length, 3 m height, and 9-inch/230 mm/0.23m thickness will require significantly more bricks than a wall measuring 5 m length, 2.5 m height, and 4.5-inch/115 mm/0.115m thickness.
2. Wall Thickness
Brick quantity per square metre of wall area increases with wall thickness. However, for the same brick size and mortar-joint thickness, the approximate number of bricks per cubic metre of masonry does not change solely because the wall is thicker.
| Common wall description in Indian practice | Approximate masonry thickness* |
|---|---|
| Half-brick or partition wall | 115 mm or 4.5 inches |
| One-brick wall | 230 mm or 9 inches |
| One-and-a-half-brick wall | 345 mm or 13.5 inches |
| Two-brick wall | 460 mm or 18 inches |
These are commonly adopted nominal masonry thicknesses in Indian construction. The actual thickness depends on brick dimensions, mortar joints, masonry bond and approved drawings. Enter the specified masonry thickness excluding plaster, unless the project measurement basis states otherwise.
3. Brick Size
Brick size also affects the total number of bricks required. Smaller bricks increase the quantity needed, while larger bricks reduce the total quantity.
4. Mortar Thickness
Mortar joint thickness affects the effective volume occupied by each brick. In most practical calculations, mortar thickness is taken as:
- 10 mm horizontal joint
- 10 mm vertical joint
5. Openings
Door, window and ventilator openings reduce the actual masonry volume.
Therefore, for a detailed estimate:
Net Wall Volume = Gross Wall Volume − Volume of Openings
This should be considered when preparing a project-level quantity estimate.
6. Brick Wastage
Some bricks may break during transportation, loading, unloading, and handling, and cutting and handling losses can increase the quantity required at site. A suitable wastage allowance should therefore be considered.
The wastage allowance should be entered according to brick quality, transportation, handling, cutting requirements, masonry bond and actual site conditions. The 5% allowance used in the worked example is illustrative only and should not be treated as a universal value.
How to Calculate Bricks for a 230 mm Wall?
For a 230 mm wall, first calculate the total wall volume:
Wall Volume = Length × Height × 0.23
Then calculate the approximate number of bricks using the nominal brick volume.
For a nominal brick size of 200 × 100 × 100 mm:
Bricks Required = Wall Volume ÷ 0.002
Finally, add an appropriate wastage allowance.
For accurate estimation, openings should also be deducted where applicable.
How to Calculate Bricks for a 115 mm Wall?
For a 115 mm wall:
Wall Volume = Length × Height × 0.115
Then:
Bricks Required = Wall Volume ÷ Nominal Brick Volume
The actual number depends on the selected brick dimensions and mortar joint allowance.
Important Tips for Accurate Brick Estimation
1. Check the wall dimensions
Take wall length, height and thickness from the latest approved drawings.
2. Deduct openings
Deduct doors, windows and other significant openings when preparing a detailed quantity estimate.
3. Verify brick dimensions
Do not assume that every supplier provides bricks of exactly the same dimensions.
4. Consider mortar joints
Mortar joint thickness affects the number of bricks required.
5. Allow for wastage
Include a reasonable wastage allowance based on site conditions.
6. Verify the final quantity at site
For major construction projects, the calculated quantity should be checked against actual material consumption.
Applications of a Brick Quantity Calculator
A brick quantity calculator can be useful for:
Residential Construction
- Houses
- Villas
- Apartments
- Residential extensions
If you want to estimate the overall building construction cost, use our House Construction Cost Calculator.
Commercial Construction
- Offices
- Shops
- Warehouses
- Commercial buildings
Other Masonry Works
- Boundary walls
- Compound walls
- Partition walls
- Small masonry structures
The calculator is useful for preliminary estimation, but final project quantities should be verified using approved drawings and project specifications.
Advantages of Using a Brick Quantity Calculator
A brick calculator can help you:
- Calculate brick quantity quickly
- Reduce manual calculation errors
- Estimate material requirements
- Plan brick procurement
- Include wastage in preliminary estimates
- Deduct entered door and window openings from the wall volume
- Prepare preliminary construction budgets
- Perform quick calculations at site
Frequently Asked Questions
How many bricks are required for 1 cubic metre of brickwork?
For a commonly used modular brick with nominal dimensions of approximately 200 × 100 × 100 mm, the preliminary estimate is around 500 bricks per cubic metre of brickwork.
The actual quantity may vary depending on brick dimensions and mortar joint thickness.
What is the standard modular brick size in India?
A commonly used modular brick size is approximately 190 × 90 × 90 mm actual size. With mortar allowance, the nominal dimensions are approximately 200 × 100 × 100 mm.
Always verify the actual brick size being used on your project.
How do I calculate bricks required for a wall?
Calculate the wall volume first:
Wall Volume = Length × Height × Thickness
Then divide the wall volume by the nominal volume occupied by one brick, including the mortar joint allowance.
Finally, add an appropriate wastage allowance.
Should door and window openings be deducted?
Yes. For detailed estimation, door, window and other significant openings should be deducted from the gross wall volume.
How much wastage should be considered for bricks?
The calculator allows users to enter a project-specific wastage percentage. A value such as 5% may be used for an illustrative preliminary estimate, but it is not a universal allowance. The appropriate percentage depends on transportation, handling, cutting, brick quality and actual site conditions.
How much mortar is required for brickwork?
Mortar quantity depends on brick size, joint thickness and workmanship. For preliminary estimation, approximately 25% to 30% of brickwork volume may be used as an approximate range.
Actual quantities should be determined based on project requirements.
Can this calculator be used for boundary walls?
Yes. It can be used for preliminary estimation of bricks for boundary walls, compound walls, partition walls and other masonry work, provided the wall dimensions and brick size are correctly entered.
What wall thickness should I use in the calculator?
Enter the actual wall thickness specified in the architectural or structural drawings. Common masonry wall thicknesses include approximately 115 mm and 230 mm, but the correct value depends on the project design.
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Summary
Brick quantity estimation is an important part of construction planning and material estimation. The required number of bricks depends on wall dimensions, wall thickness, brick size, mortar joints, openings and construction wastage.
The Brick Quantity Calculator provides a quick preliminary estimate of the number of bricks required after deducting entered door and window openings and applying the user-selected wastage allowance.
For final construction quantities, always verify the calculation using approved drawings, actual brick dimensions, project specifications and site conditions.
About T Square Civil Engineering
T Square Civil Engineering is a learning platform dedicated to providing accurate, practical, and easy-to-understand civil engineering knowledge. Our mission is to help students, site engineers, and construction professionals bridge the gap between engineering theory and real-world construction practice through technically reviewed guides, practical examples, calculators, and industry-focused learning resources.
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