A brick calculator takes the guesswork out of masonry projects by estimating the exact number of bricks and mortar bags you need based on your wall dimensions and brick type. Whether you are building a garden wall, a retaining wall, or the exterior of a structure, accurate estimates prevent costly over-ordering and frustrating mid-project shortages.
Brick & Mortar Estimator
Wall Dimensions
Or enter total area directly:
Openings (doors, windows — optional)
Brick & Mortar Settings
Waste Factor & Pricing
Project Breakdown
Brick Dimensions Reference
| Type | Dimensions (L×H×D) | Bricks/Sq Ft* |
|---|---|---|
| Standard | 8 × 2.25 × 3.625 in | ~6.75 |
| Modular | 7.625 × 2.25 × 3.625 in | ~7.0 |
| Queen | 7.625 × 2.75 × 2.75 in | ~5.9 |
| King | 9.625 × 2.625 × 2.75 in | ~4.5 |
* With standard 3/8" mortar joint, single wythe (one brick thick)
How to Use the Brick Calculator
Estimating bricks for a masonry project is one of those tasks that seems straightforward but is easy to get wrong — and getting it wrong is expensive. Order too few bricks and you risk a dye-lot mismatch when you reorder; order too many and you have spent money on surplus material. This brick calculator handles the math for you, converting wall dimensions into an exact brick count, mortar bag estimate, and optional cost total.
Step 1: Enter Your Wall Dimensions
Start by entering the length and height of your wall in feet. The calculator multiplies these together to get the gross wall area. If you already know the total square footage — for example, from architectural drawings — enter it directly in the "Total Area" field, which overrides the length × height calculation. This is useful for walls with irregular heights or combined totals for multiple sections.
Step 2: Subtract Openings for Doors and Windows
Doors, windows, and any other openings in the wall reduce the amount of brick you need. Enter the width and height of each opening in the provided fields. The brick calculator subtracts the total opening area from the gross wall area, giving you the net masonry area to work with. Up to three openings can be entered — for larger projects with many openings, calculate each section of solid wall separately.
Step 3: Select Your Brick Type
Choose the brick type that matches what your supplier sells. Standard bricks (8×3.625×2.25 inches) are the most common in North America and yield approximately 6.75 bricks per square foot with a standard 3/8-inch mortar joint. Modular bricks are slightly shorter in length, producing about 7.0 per square foot. Queen and King bricks are taller, so you need fewer courses to reach a given wall height — they are often chosen for aesthetic reasons or to speed up laying.
Step 4: Choose Mortar Joint Width
The mortar joint width affects both the bricks-per-square-foot count and the mortar quantity. The standard 3/8-inch joint is correct for most residential brick laying. Thinner joints (1/4 inch) create a tighter, more refined appearance typical of historic brickwork. Wider joints (1/2 to 5/8 inch) are used for rough stone or decorative applications. The calculator adjusts the bricks-per-sqft figure based on your selected joint size.
Step 5: Set the Waste Factor
Always order more bricks than your net calculation. A 5% waste factor is appropriate for a simple rectangular garden wall with no cuts. Choose 7% for typical projects with some cuts at corners and openings. Use 10% for projects with many openings, curved sections, or complex patterns. The wasted bricks account for cuts that cannot be reused, breakage during transport and laying, and a small supply of extras to keep on hand for future repairs.
Step 6: Add Pricing for a Cost Estimate
Enter the price per brick and price per mortar bag from your local supplier. The calculator multiplies your total brick count by the unit price and adds the mortar cost to give a total material estimate. This figure covers brick and mortar only — labor, wall ties, lintels, damp-proof course, and other accessories should be budgeted separately for a complete project cost.
Frequently Asked Questions
Is this brick calculator free to use?
Yes, this brick calculator is completely free with no signup required, no paywalls, and no limits. All calculations run entirely in your browser — your project dimensions are never sent to any server and stay private on your device.
Is my data private when I use this tool?
Absolutely. Every calculation runs locally in your browser using client-side JavaScript. No wall dimensions, measurements, or personal information are ever transmitted to a server. Your data stays entirely on your device.
How many bricks do I need per square foot?
For a standard brick (8×3.625×2.25 inches) with a 3/8-inch mortar joint, you need approximately 6.75 bricks per square foot. Modular bricks are slightly smaller at about 7.0 bricks per square foot. The exact count depends on your mortar joint width and the brick type you choose.
How many mortar bags do I need per 1,000 bricks?
A general rule is approximately 7 bags of 80-pound mortar mix per 1,000 bricks for standard brick laying. This accounts for both bed joints (horizontal) and head joints (vertical). The actual amount can vary based on joint thickness, brick absorption, and mason technique.
Why should I add a waste factor when ordering bricks?
A waste factor of 5–10% accounts for bricks cut at corners and openings, breakage during delivery and handling, and replacement of defective bricks. For simple rectangular walls, 5% is sufficient. For walls with many openings or complex angles, use 10% to avoid running short mid-project.
What is the difference between standard and modular bricks?
Standard bricks measure 8×3.625×2.25 inches (nominal). Modular bricks are slightly smaller at 7.625×3.625×2.25 inches nominal and are designed so that 3 courses of brick plus mortar equals exactly 8 inches — a common modular dimension in construction. Queen and King bricks are taller, reducing the number of courses needed for a given wall height.
Can I subtract doors and windows from the brick count?
Yes. The calculator includes an openings section where you can enter the width and height of up to three openings (doors, windows, garage doors). The tool subtracts the opening areas from the total wall area before calculating bricks and mortar, so your material estimate excludes the masonry you do not need.
How do I calculate the total wall area for an L-shaped or irregular wall?
Break the wall into rectangular sections and calculate each section separately. Add the brick counts from each section together for your total. Alternatively, calculate the total perimeter length times the wall height, then subtract any corners counted twice in your perimeter measurement.