Brick Calculator
Wall Area (sq ft)
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Bricks Needed (with 10% waste)
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Mortar Bags (70lb)
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Estimated Cost
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How Brick Calculation Works
Brick calculation is the process of determining how many bricks you need for a wall, patio, or structure by dividing the net wall area by each brick's face area (including mortar). Estimating correctly involves three main steps: calculating the total wall area, determining the face area each brick covers (including the mortar joint), and dividing to find how many bricks are needed. The total wall area is simply length multiplied by height, minus the area of any openings such as doors, windows, and archways. Each brick covers a certain face area that includes the brick itself plus the mortar joint on one side and one bottom edge.
Mortar joint thickness has a significant impact on the total number of bricks required. The standard mortar joint in the United States is 3/8 inch (10 mm), as specified by ASTM masonry standards. A thicker joint means each brick-plus-mortar unit covers a slightly larger face area, so fewer bricks are needed per square foot. Conversely, thin 1/4-inch joints result in more bricks per square foot. The bond pattern -- how bricks are arranged and staggered -- also affects the total count because certain patterns require more cut bricks, which increases waste.
After calculating the exact number of bricks needed, always add a waste factor. For straightforward running bond walls with few openings, 5% extra is sufficient. For walls with multiple windows and doors, corners, curves, or decorative patterns, 10% or even 15% extra is advisable. It is always better to have leftover bricks than to run short mid-project, especially since brick colors can vary between production batches.
Brick Formulas
The core formula for estimating bricks is straightforward. You divide the net wall area by the face area of one brick (including its mortar joint), then add a waste percentage.
Bricks Needed
Bricks = (Wall Area − Openings) × Bricks per sq ft × (1 + Waste%)
Bricks per Square Foot
Bricks/sqft = 144 ÷ ((L + joint) × (H + joint))
Where L and H are the brick length and height in inches, and joint is the mortar joint width in inches. 144 converts from square inches to square feet.
Worked example: You need to build a garden wall that is 20 feet long and 4 feet high with no openings. Wall area = 20 × 4 = 80 square feet. Using standard modular bricks (7.625″ × 2.25″) with 3/8″ mortar joints: bricks per square foot = 144 ÷ ((7.625 + 0.375) × (2.25 + 0.375)) = 144 ÷ (8 × 2.625) = 144 ÷ 21 = 6.86 bricks/sqft. Total = 80 × 6.86 = 549 bricks. Adding 10% waste: 549 × 1.10 = 604 bricks. You would also need about 4 to 5 bags of 70-lb mortar mix.
Key Terms
| Term | Definition |
|---|---|
| Course | A single horizontal row of bricks in a wall. Most walls are built course by course from the bottom up. |
| Header | A brick laid so its short end faces out, used to tie two wythes (layers) of brick together. |
| Stretcher | A brick laid so its long side faces out -- the most common orientation in running bond walls. |
| Mortar Joint | The layer of mortar between bricks, typically 3/8 inch (10 mm) thick. Provides adhesion and allows for slight size variations in bricks. |
| Waste Factor | The percentage of extra bricks ordered to account for breakage, cutting, and defective units. Typically 5-15%. |
| Bond Pattern | The arrangement of bricks in a wall. Running bond, stack bond, Flemish bond, and herringbone are common patterns. |
| Wythe | A single vertical layer of bricks in a wall. A double-wythe wall is two bricks thick. |
Common Brick Sizes
Brick sizes vary by region and type. The table below shows the most common brick sizes used in the United States, along with the approximate number of bricks needed per square foot of wall face when using a standard 3/8-inch mortar joint in running bond pattern.
| Brick Type | Actual Size (L × H × W) | Nominal Size | Bricks per sq ft |
|---|---|---|---|
| Modular | 7-5/8″ × 2-1/4″ × 3-5/8″ | 8″ × 2-2/3″ × 4″ | 6.86 |
| Standard | 8″ × 2-1/4″ × 3-5/8″ | 8-3/8″ × 2-2/3″ × 4″ | 6.55 |
| Queen | 8″ × 2-3/4″ × 3-5/8″ | 8-3/8″ × 3-1/8″ × 4″ | 5.76 |
| King | 9-5/8″ × 2-3/4″ × 2-3/4″ | 10″ × 3-1/8″ × 3-1/8″ | 4.61 |
| Closure | 7-5/8″ × 3-5/8″ × 3-5/8″ | 8″ × 4″ × 4″ | 4.50 |
| Engineer Modular | 7-5/8″ × 2-13/16″ × 3-5/8″ | 8″ × 3-1/5″ × 4″ | 5.68 |
Bond Patterns
The bond pattern determines the visual appearance and structural strength of a brick wall. Different patterns require different amounts of cutting and waste. Here are the most common bond patterns used in residential and commercial construction.
| Pattern | Description | Waste Factor | Best For |
|---|---|---|---|
| Running Bond | Each course offset by half a brick. Most common pattern. | 5% | Structural walls, general construction |
| Stack Bond | All joints aligned vertically. Grid appearance. | 3-5% | Decorative veneers, non-structural |
| Flemish Bond | Alternating headers and stretchers in each course. | 5-10% | Double-wythe walls, traditional style |
| English Bond | Alternating courses of all headers and all stretchers. | 5-10% | Strong structural walls, foundations |
| Herringbone | Bricks laid at 45-degree angles in a zigzag pattern. | 10-15% | Patios, walkways, decorative panels |
| Basketweave | Pairs of bricks alternating horizontal and vertical. | 5-10% | Patios, walkways, floors |
Practical Examples
Garden wall: A decorative garden wall 25 feet long and 3 feet high with no openings. Wall area = 75 square feet. Using modular bricks at 6.86 per square foot: 75 × 6.86 = 515 bricks. Add 10% waste: 515 × 1.10 = 567 bricks. You would need about 4 bags of 70-lb mortar mix. At roughly $0.75 per brick and $12 per mortar bag, the materials cost would be approximately $473.
House exterior: A single-story home exterior is 120 linear feet of wall perimeter, 9 feet high, with 6 windows (15 sq ft each) and 2 doors (20 sq ft each). Total wall area = 120 × 9 = 1,080 sq ft. Subtract openings: 1,080 − (6 × 15) − (2 × 20) = 1,080 − 90 − 40 = 950 sq ft. At 6.86 bricks per sq ft: 950 × 6.86 = 6,517 bricks. With 10% waste: 7,169 bricks, which is about 14 to 18 pallets depending on brick size. Budget roughly $5,500 to $7,200 for materials alone.
Fireplace surround: A fireplace surround measuring 6 feet wide and 5 feet high with a 3 ft × 2.5 ft firebox opening. Wall area = 30 − 7.5 = 22.5 sq ft. At 6.86 bricks per sq ft: 155 bricks. Add 15% waste for the cuts around the firebox: 178 bricks. This is a small enough project that one or two bags of mortar will suffice.
Patio or walkway: A brick patio 12 feet by 10 feet = 120 sq ft. For flat-laid pavers in running bond, you need about 4.5 standard bricks per square foot (bricks laid flat rather than on edge): 120 × 4.5 = 540 bricks. Add 10% for cuts: 594 bricks. You will also need a sand base (about 1 ton per 120 sq ft at 1-inch depth) and polymeric sand for joints.
Tips for Ordering Bricks
Always order extra. Add 5-10% to your calculated total for running bond walls and 10-15% for complex patterns or walls with many openings. Cuts around windows and doors generate unavoidable waste, and some bricks will inevitably arrive cracked or chipped.
Order from a single batch. Brick color can vary noticeably between production batches, even from the same manufacturer. Order all your bricks at once and from the same production run. When building, pull bricks from multiple pallets simultaneously to blend any slight color variations across the wall.
Plan for delivery. Standard pallets weigh 2,000 to 2,500 pounds. Make sure you have adequate access for a flatbed truck and a plan for unloading (a forklift or the delivery truck's boom). Place pallets close to the work area to minimize manual carrying. Custom colors and sizes may require 4 to 8 weeks lead time, so order well before your project start date.
Check weathering grade. For exterior walls in freeze-thaw climates, specify severe weathering (SW) grade bricks rated for at least 3,000 psi compressive strength per ASTM C62. Interior walls or warm climates can use the less expensive moderate weathering (MW) or negligible weathering (NW) grades.
Keep spare bricks. Store 20 to 50 extra bricks for future repairs. Matching brick color and texture years later is extremely difficult, so having originals on hand saves significant trouble when repairs are needed.
This calculator is for informational purposes only and does not constitute financial, tax, or legal advice. Always consult a qualified professional for decisions specific to your situation.
Frequently Asked Questions
How many bricks do I need per square foot?
For standard modular bricks (7-5/8 x 2-1/4 x 3-5/8 inches) with a 3/8-inch mortar joint in running bond, you need approximately 6.86 bricks per square foot of wall face. Larger bricks like queen size require fewer per square foot (about 5.76), while smaller bricks require more. The mortar joint width also affects the count -- thicker joints mean fewer bricks per square foot.
How much mortar do I need per 1,000 bricks?
For standard modular bricks with 3/8-inch mortar joints in running bond, you need approximately 7 bags of 70-pound premixed mortar per 1,000 bricks, or about 21 cubic feet of mortar. This covers both the bed joints (horizontal) and the head joints (vertical). Thicker joints, such as 1/2 inch, will increase mortar requirements by 25-30%.
What is the standard brick size in the US?
The standard modular brick in the United States measures 7-5/8 x 2-1/4 x 3-5/8 inches (length x height x width). With a standard 3/8-inch mortar joint, the nominal size becomes 8 x 2-2/3 x 4 inches. Other popular sizes include queen (8 x 2-3/4 x 3-5/8), king (9-5/8 x 2-3/4 x 2-3/4), and closure (7-5/8 x 3-5/8 x 3-5/8). Brick sizes vary internationally -- UK standard bricks measure 215 x 102.5 x 65 mm.
How much waste should I add when ordering bricks?
Add 5% waste for simple running bond walls with few openings. Add 10% for walls with multiple doors, windows, or corners. Add 10-15% for complex patterns like herringbone, basketweave, or any project requiring many angled cuts. If the brick color is custom or difficult to reorder, consider 15% extra to ensure you have enough from the same production batch.
What is the difference between running bond and stack bond?
Running bond staggers each course by half a brick length, creating the classic offset pattern you see on most buildings. It is the strongest bond pattern because no vertical joints align. Stack bond places all bricks directly above each other with aligned vertical joints, creating a modern grid look. Stack bond is structurally weaker and typically used only for decorative veneers or non-load-bearing walls, often reinforced with horizontal joint reinforcement.
How do I calculate bricks for a wall with openings?
Measure the total wall area (length times height), then subtract the area of every door, window, and other opening. A standard interior door is about 20 sq ft (3 ft x 6.67 ft), and a standard window is about 15 sq ft (3 ft x 5 ft). Multiply the net wall area by your bricks per square foot, then add a 10% waste factor. The extra waste accounts for the additional cuts needed around openings, which generate more partial bricks than plain wall sections.