Use the brick calculator to estimate how many bricks you need for a wall. Enter the wall dimensions, subtract doors and windows, select the number of brick layers, enter the brick face size and mortar-joint thickness, and add a waste allowance. The calculator will show the net wall area, brick quantity before waste, additional bricks, suggested order quantity, and estimated brick cost.
This guide explains how to enter each value and understand the results. The calculator estimates brick quantity only. It does not determine whether a wall design is structurally suitable or calculate foundations, reinforcement, wall ties, lintels, mortar ingredients, labor, or installation time.
What Does a Brick Calculator Estimate?
A brick calculator compares the net area of the wall with the face area covered by one brick and its surrounding mortar joint. It then adjusts the quantity for the number of brick layers and the selected waste percentage.
The results can include:
- Gross wall area
- Total opening area
- Net brickwork area
- Bricks required before waste
- Additional bricks for waste
- Suggested brick order
- Approximate bricks per square foot or square meter
- Estimated brick cost
- Calculation breakdown
The calculator supports Imperial / US and Metric measurements. It converts the entered dimensions into compatible units before calculating the wall area and brick coverage.
Measurements and Information You Need
Collect the following information before using the calculator:
- Wall length
- Wall height
- Number of identical walls
- Total area of doors, windows, and other openings
- Number of brick layers
- Brick length
- Brick height
- Mortar-joint thickness
- Waste allowance
- Optional brick price
Use the actual face dimensions of the brick where possible. Brick dimensions and names vary by manufacturer and region, so do not assume that every “standard” or “modular” brick has the same measurements.
Measure walls with different lengths or heights separately. Use the identical-wall quantity field only when every included wall has the same dimensions and brick arrangement.
How to Use the Brick Calculator
Step 1: Select the Unit System
Choose the measurement system used for the project:
- Imperial / US
- Metric
Imperial / US measurements may use feet and inches. Metric measurements may use meters, centimeters, and millimeters.
Check the unit beside every value. Entering a brick measurement in inches while millimeters are selected will produce an incorrect brick count.
Step 2: Enter the Wall Length
Enter the horizontal length of the wall in the Wall length field. Measure only the section that will contain brickwork.
For a straight wall, measure from one end of the planned brickwork to the other. If the project includes several connected walls with different lengths, calculate each wall separately or divide the project into rectangular sections.
Step 3: Enter the Wall Height
Enter the vertical height of the brickwork in the Wall height field.
Measure from the planned starting level of the brickwork to its finished height. Do not automatically include foundations, footings, parapet caps, or other components that will not be constructed from the selected brick.
If the wall has a sloping or stepped top, divide it into simpler shapes and calculate the sections separately. A rectangular calculator cannot precisely represent every irregular wall shape.
Step 4: Enter the Number of Identical Walls
Use the Number of identical walls field when several walls have exactly the same length, height, number of layers, and openings.
For example, enter:
- 1 for one wall
- 2 for two matching walls
- 4 for four identical wall sections
Calculate walls with different dimensions separately. Do not use an average length or height when the difference between walls is substantial.
Step 5: Enter the Area of Doors and Windows
Openings reduce the area that must be covered with bricks. Calculate the area of each rectangular opening:
Opening area = Opening width × Opening height
Add the areas of all doors, windows, vents, access panels, and other openings. Enter the combined amount in the Total opening area field.
For example, a door measuring 3 feet wide and 7 feet high has an area of:
3 × 7 = 21 ft²
If the wall also contains a window measuring 4 feet by 3 feet, its area is:
4 × 3 = 12 ft²
The total opening area is:
21 + 12 = 33 ft²
Do not subtract an opening more than once. The total opening area must also be smaller than the gross wall area.
Step 6: Select the Number of Brick Layers
Select the number of brick layers, also called wythes, included across the wall thickness.
- Single layer: One brick layer across the wall area
- Double layer: Two brick layers covering the same wall area
A double-layer calculation generally requires approximately twice the face-brick quantity of a single-layer calculation before adjustments. However, actual wall construction may include bonding patterns, headers, returns, corners, piers, cavities, cut units, and other details that affect the final quantity.
Confirm the wall assembly and number of brick layers from the drawings or with the builder. The calculator does not select a suitable wall type.
Step 7: Enter the Brick Length
Enter the horizontal face length of one brick. This is the dimension visible along the wall when the brick is laid in its normal orientation.
Use the actual specified brick measurement without adding the mortar joint yourself. The calculator adds the selected joint thickness separately.
Brick names do not guarantee an exact size. Check the product specification, supplier information, or a sample brick before ordering.
Step 8: Enter the Brick Height
Enter the vertical face height of one brick. Do not enter the brick depth unless the calculator specifically requests that dimension.
For a wall-area calculation, the important face dimensions are:
- Brick length
- Brick height
Brick depth affects wall thickness and construction details, but it does not normally change how much face area one stretcher-laid brick covers.
Step 9: Enter the Mortar-Joint Thickness
Enter the planned mortar-joint thickness. The calculator adds this measurement to the brick face length and height to determine the modular area occupied by one brick.
The effective face dimensions are calculated as:
Effective length = Brick length + Mortar-joint thickness
Effective height = Brick height + Mortar-joint thickness
For example, a US modular brick may have specified face dimensions of approximately 7โ inches by 2¼ inches. With a โ -inch joint, its nominal face module becomes approximately 8 inches by 2โ inches.
Mortar joints can vary with the brick type, masonry specification, workmanship, joint profile, and regional construction practice. Use the joint thickness stated in the project documents or recommended for the selected brick.
This field helps calculate brick coverage. It does not estimate mortar volume, cement, sand, or mortar bags.
Step 10: Choose a Waste Allowance
Enter the additional percentage you want included in the Waste allowance field.
A waste allowance can help cover:
- Broken or damaged bricks
- Cut bricks
- Corner and return details
- Color or appearance rejection
- Minor measurement differences
- Future repairs requiring matching bricks
A simple rectangular wall with few cuts may require a smaller allowance than a wall with many corners, openings, patterns, or complex details. Confirm the appropriate percentage with the brick supplier or masonry contractor.
Enter 0% if you want to see the calculated quantity before any extra bricks are added.
Step 11: Enter the Brick Price
Enter an optional brick price if you want to estimate material cost. Use the pricing unit requested by the calculator, such as:
- Price per brick
- Price per pack
- Price per thousand bricks
Make sure the entered price matches the selected pricing method. A price per thousand bricks cannot be entered as though it were the price of one brick.
The estimated brick cost may not include:
- Mortar materials
- Delivery and unloading
- Pallet deposits
- Labor
- Foundations and footings
- Wall ties and reinforcement
- Lintels and flashing
- Insulation and drainage materials
- Equipment or scaffolding
- Taxes and supplier fees
Leave the price field empty if you only need the brick quantity.
Step 12: Select Calculate Bricks
Review the wall dimensions, number of walls, openings, layers, brick dimensions, mortar joint, waste allowance, and optional price. Select Calculate Bricks when every entry is correct.
The calculator may request a correction when:
- A required measurement is missing
- A dimension is zero or negative
- The number of walls is not a valid whole number
- The opening area is greater than or equal to the wall area
- The brick length or height is invalid
- The mortar joint is outside the supported range
- The waste allowance is outside the supported range
- The optional price contains an invalid value
- The calculated wall area exceeds the supported range
Correct the highlighted value and calculate again.
How to Read the Brick Calculator Results
Gross Wall Area
The Gross wall area is the complete rectangular wall area before doors, windows, and other openings are removed.
The calculator uses:
Gross wall area = Wall length × Wall height × Number of identical walls
Imperial results may display square feet. Metric results may display square meters.
Total Opening Area
The Total opening area is the combined area of the doors, windows, vents, and other spaces entered by the user.
If identical walls each contain the same openings, check how the calculator applies the opening value. Enter either the openings for one wall or the combined openings for all walls according to the field label shown in the calculator.
Net Brickwork Area
The Net brickwork area is the wall area that remains after subtracting openings.
Net brickwork area = Gross wall area − Total opening area
This is the area used to calculate the main brick quantity.
Bricks Required Before Waste
The Bricks required before waste result is the estimated number needed to cover the net wall area using the selected brick size, mortar-joint thickness, and number of layers.
The calculator rounds the quantity to whole bricks because partial bricks cannot normally be purchased as individual units.
Additional Bricks for Waste
The Additional bricks result shows how many units were added through the selected waste allowance.
For example, if the calculation requires 1,000 bricks before waste and you select 10%, the calculator adds approximately 100 bricks.
Suggested Brick Order
The Suggested brick order is the brick quantity after the waste allowance is included.
This is the main quantity to discuss with the brick supplier. The actual purchase quantity may need to be adjusted according to pack size, pallet quantity, supplier minimums, available stock, and delivery conditions.
When appearance matters, ask whether all bricks can be supplied from a compatible production batch. Bricks ordered later may have noticeable color or texture differences.
Bricks per Unit Area
The calculator may show the approximate number of bricks required per square foot or square meter. This value is based on the entered brick face dimensions and mortar-joint thickness.
A larger brick covers more wall area and normally produces a lower number of bricks per unit area. A smaller brick or thinner joint normally increases the number required.
Estimated Brick Cost
The estimated brick cost is based on the waste-adjusted order quantity and the entered brick price.
When the price is entered per brick:
Estimated cost = Suggested brick order × Price per brick
If the calculator supports pack or thousand-brick pricing, it converts the quantity according to the selected pricing method.
This result is a brick material estimate, not a complete wall construction quotation.
Calculation Breakdown
The calculation breakdown summarizes the wall dimensions, openings, net area, brick dimensions, mortar-joint thickness, wall layers, waste percentage, and brick quantity.
Review this section before purchasing materials. It can help identify an incorrect unit, brick size, opening area, or layer selection.
Brick Calculator Formula
The calculator first finds the gross wall area:
Gross wall area = Length × Height × Number of walls
It then subtracts openings:
Net wall area = Gross wall area − Opening area
The effective face area of one brick includes the mortar joint:
Brick module area = (Brick length + Joint) × (Brick height + Joint)
The number of bricks before waste is estimated using:
Bricks before waste = (Net wall area ÷ Brick module area) × Number of layers
The waste allowance is then added:
Suggested brick order = Bricks before waste × (1 + Waste percentage ÷ 100)
The final result is rounded up to a whole brick. All dimensions must be converted into compatible units before the calculation is completed.
Imperial / US Brick Calculation Example
Suppose a single-layer wall measures 20 feet long and 8 feet high. It contains one door measuring 3 feet by 7 feet. The selected brick has a face length of 7โ inches and a height of 2¼ inches. The mortar joint is โ inch, and the waste allowance is 10%.
- Wall length: 20 ft
- Wall height: 8 ft
- Number of walls: 1
- Opening area: 21 ft²
- Brick layers: 1
- Brick face length: 7โ in
- Brick face height: 2¼ in
- Mortar joint: โ in
- Waste allowance: 10%
Calculate the gross wall area:
20 × 8 = 160 ft²
Subtract the door:
160 − 21 = 139 ft²
Add the mortar joint to the brick face dimensions:
7โ + โ = 8 in
2¼ + โ = 2โ in
Calculate the modular face area:
8 × 2.625 = 21 in²
Convert the net wall area to square inches:
139 × 144 = 20,016 in²
Calculate bricks before waste:
20,016 ÷ 21 = approximately 953.14 bricks
Round up to 954 bricks and add 10% waste:
954 × 1.10 = 1,049.4 bricks
The suggested order is approximately 1,050 bricks. The supplier may adjust this quantity to complete packs or pallets.
Metric Brick Calculation Example
Suppose a single-layer wall measures 6 meters long and 2.4 meters high. It contains a window measuring 1.2 meters by 1 meter. The brick face measures 215 millimeters by 65 millimeters, the mortar joint is 10 millimeters, and the waste allowance is 10%.
- Wall length: 6 m
- Wall height: 2.4 m
- Number of walls: 1
- Window area: 1.2 m²
- Brick layers: 1
- Brick face length: 215 mm
- Brick face height: 65 mm
- Mortar joint: 10 mm
- Waste allowance: 10%
Calculate the gross wall area:
6 × 2.4 = 14.4 m²
Subtract the window:
14.4 − 1.2 = 13.2 m²
Add the mortar joint to the brick face dimensions:
215 + 10 = 225 mm
65 + 10 = 75 mm
Convert the modular dimensions to meters:
225 mm = 0.225 m
75 mm = 0.075 m
Calculate the modular face area:
0.225 × 0.075 = 0.016875 m²
Calculate bricks before waste:
13.2 ÷ 0.016875 = approximately 782.22 bricks
Round up to 783 bricks and add 10% waste:
783 × 1.10 = 861.3 bricks
The suggested order is approximately 862 bricks before adjustment to the supplier’s pack or pallet quantity.
How to Calculate Walls with Several Openings
Calculate the area of every opening separately and then add the results together.
For example, a wall contains:
- One door measuring 0.9 m × 2.1 m
- Two windows, each measuring 1.2 m × 1 m
Door area:
0.9 × 2.1 = 1.89 m²
Window area:
1.2 × 1 × 2 = 2.4 m²
Total opening area:
1.89 + 2.4 = 4.29 m²
Enter 4.29 m² as the total opening area when the calculator requests one combined value.
Do not subtract spaces that will still require bricks, such as areas above lintels, below windows, or around recessed features.
Why Brick Size and Mortar Joint Matter
The number of bricks required per unit area depends on the combined size of the brick face and mortar joint. Even bricks with similar names can have different specified measurements.
A thicker mortar joint increases the modular area assigned to each brick, which reduces the calculated number of bricks per square foot or square meter. A thinner joint has the opposite effect.
Small differences can become significant across a large wall. Confirm both measurements from the brick supplier and project specification before placing the final order.
How to Download, Print, or Share the Result
After completing a successful calculation, use Share Result, Download PDF, or Print Results when available.
If you change an input after calculating, calculate again before downloading or printing. This ensures the report contains the latest measurements and results.
Common Brick Calculator Mistakes
- Using the wrong brick dimensions: Check the selected product instead of relying only on names such as standard or modular.
- Entering brick depth as face height: Use the dimensions visible on the wall face.
- Adding the mortar joint twice: Enter the actual brick size and place the joint thickness in its separate field.
- Ignoring openings: Subtract doors, windows, vents, and other spaces that will not contain bricks.
- Subtracting openings twice: Enter each opening only once.
- Using gross area instead of net area: The brick count should be based on the wall area remaining after openings.
- Selecting the wrong number of layers: A double-layer wall requires more bricks than a single-layer wall.
- Combining different walls: Calculate walls with different dimensions or openings separately.
- Mixing feet, inches, meters, and millimeters: Check the unit beside every value.
- Adding waste twice: Do not increase the wall measurements manually when using the waste field.
- Ignoring pack or pallet quantities: Suppliers may sell bricks only in fixed quantities.
- Treating brick cost as total wall cost: Mortar, labor, delivery, foundations, ties, and other materials may not be included.
- Assuming the calculator estimates mortar: Mortar-joint thickness is used for brick coverage, not mortar-material quantity.
- Changing values without recalculating: Calculate again after changing any input.
Final Check Before Ordering Bricks
Confirm the wall length, height, number of identical walls, total opening area, number of brick layers, brick face dimensions, mortar-joint thickness, and waste allowance.
Ask the brick supplier or masonry contractor to confirm:
- The exact brick dimensions
- Recommended mortar-joint thickness
- Bricks per pack or pallet
- Minimum order quantity
- Suitable waste allowance
- Availability from a compatible production batch
- Delivery and unloading requirements
- Special units needed for corners, sills, caps, or other details
The Brick Calculator provides a planning estimate. Actual brick use can change because of bond pattern, wall returns, corners, piers, cuts, breakage, workmanship, and construction details. Confirm the final order from the project drawings and with the supplier or masonry contractor.