Brick Calculator
Last Updated: May 2026
Need quick material numbers? Our Brick Calculator instantly determines the exact bricks, mortar bags, and total estimated costs for your upcoming masonry construction project. You simply input your dimensions, and the tool does the math based on exact industry standards.
incl. waste
Based on standard yield
| Exact Bricks Needed Without any wastage allowance | - |
| Net Wall Area Total wall area minus doors & windows | - |
| Estimated Mortar Volume Includes standard buffer for brick holes (cores/frogs) | - |
How to Use the Brick Calculator
Proper masonry estimating requires exact variables. This tool handles multiple technical inputs to give you a highly accurate material breakdown.
- Choose Calculation Method: Select “By Wall Dimensions” to enter exact length and height. Select “By Total Area” if you already know your total wall area.
- Subtract Openings: Add the width and height of your doors and windows. The calculator subtracts these to find your true net wall area.
- Select Wall Thickness: Pick a single wythe wall (half-brick thick) or a double wythe wall (one-brick thick). Double wythe walls multiply the baseline brick count by two.
- Pick Brick Size: Choose from pre-loaded standard brick dimensions or enter custom actual sizes manually.
- Define Mortar Joint: The default mortar joint thickness is 3/8 inch (10mm). You can adjust this or enter 0 if you are building a dry-stack brick retaining wall.
- Set Wastage Factor: A 10% wastage factor is standard for corner cuts and site breakage.
- Enter Prices: Add the cost per brick and cost per mortar bag to get your final project budget.
Standard Brick Sizes and Dimensions
Brick sizes change depending on the region and the visual style you want, such as standard face brick versus thin brick veneer. The calculator comes with these built-in sizes:
- US Modular Bricks: 7 ⅝” × 2 ¼” × 3 ⅝”
- US Standard: 8″ × 2 ¼” × 3 ⅝”
- US Engineer: 8″ × 2 ¾” × 3 ⅝”
- US Queen: 8″ × 2 ¾” × 3″
- US King: 9 ⅝” × 2 ⅝” × 3″
- UK Standard: 215mm × 65mm × 102.5mm
- Australian Standard: 230mm × 76mm × 110mm
The calculations adapt automatically. The tool adds your selected mortar joint thickness to the actual brick length and height to figure out the exact surface face area of one brick unit.
How We Estimate Mortar Volume
Figuring out the exact cubic feet of mortar manually is very difficult. Our tool uses a geometric subtraction method. It takes the total solid wall volume and subtracts the pure solid brick volume.
Because many bricks have cores or frogs (holes in the brick bed), we apply a standard +15% modifier to the raw mortar volume. This extra volume fills the internal brick holes and covers normal job-site waste.
For bagged mortar, we calculate the 80lb mortar bag yield based on a standard output of 0.60 cubic feet of wet mortar per bag. This ensures you buy enough Portland cement and sand mixture to finish the job without stopping.
Frequently Asked Questions (FAQs)
How many US modular bricks do I need for 100 square feet?
For a 100 sq ft single wythe wall using US modular bricks and a standard 3/8″ mortar joint, you need exactly 686 bricks. If you add a 10% wastage factor, you should order 755 bricks.
What is a wythe in brickwork?
A wythe is a continuous vertical section of masonry one unit thick. A single wythe wall uses one layer of bricks. A double wythe wall uses two parallel layers, meaning you must double your exact brick count.
Should I deduct doors and windows?
Yes. You must subtract all openings from your gross wall area to find the net wall area. If you calculate bricks based on the gross area, you will over-order materials and lose money.
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Sources & References
Our Brick Calculator bases its logic on official ASTM specifications and industry standards:
ASTM C216 – Standard Specification for Facing Brick: This document dictates the specific physical requirements, dimensions, and tolerances for solid masonry units made from clay or shale.
About the Developer: Qazi Raza
Qazi Raza is a web developer and search engine optimization specialist who has spent years building programmatic calculators for real‑world construction, landscaping, and renovation projects. By combining engineering reference data with practical field standards, he designs tools that help homeowners, DIYers, and contractors estimate materials with confidence. Every calculator is built from verified density charts, compaction guidelines, and industry‑accepted formulas.