Face Brick Calculator: How Many Bricks You Need

This face brick calculator works out how many bricks you need for a wall, wall section, or house elevation. Enter the wall’s length and height, plus the brick size and mortar joint thickness you plan to use, and it returns the total number of bricks, including a waste allowance. You get a count you can take straight to a supplier, along with the wall area in square feet and square meters.

Formula

The calculator uses the standard brick-counting method: divide the wall’s face area by the face area of one brick including its mortar joint, then multiply by a waste factor. In words:

• Convert wall length and height from feet to inches (multiply by 12).
• Add the mortar joint thickness to the brick’s length and to its depth to get the “unit” dimensions.
• Divide the wall’s area in square inches by the unit area (length × depth) to get the number of bricks without waste.
• Multiply by (1 + waste percentage/100) and round up to a whole brick.

Symbolically: Bricks = ceil[(L×12 / (b_len + j)) × (H×12 / (b_dep + j)) × (1 + w/100)]

Where:

• L = wall length in feet
• H = wall height in feet
• b_len = brick length in inches (the dimension along the wall)
• b_dep = brick depth in inches (the dimension up the wall, often called brick height)
• j = mortar joint thickness in inches (typically 3/8″ or 0.375″)
• w = waste allowance percentage (typically 5–10%)

Worked Example

Using the default values: wall length = 20 ft, wall height = 8 ft, brick length = 7.5 in, brick depth = 3.5 in, mortar joint = 0.375 in, waste = 10%.

1. Wall length in inches: 20 × 12 = 240 in
2. Wall height in inches: 8 × 12 = 96 in
3. Unit length = 7.5 + 0.375 = 7.875 in
4. Unit depth = 3.5 + 0.375 = 3.875 in
5. Number of bricks along length = 240 / 7.875 = 30.476
6. Number of bricks up height = 96 / 3.875 = 24.774
7. Bricks without waste = 30.476 × 24.774 = 755.0 (approximately)
8. With 10% waste: 755 × 1.10 = 830.5 → round up to 831 bricks

The calculator returns 831 bricks for the default wall, matching the manual calculation.

Understanding Brick Sizes and Mortar Joints

Face brick (also called facing brick) is made to be visible, so its dimensions matter for both aesthetics and quantity. In the US, a standard modular brick is 7.5″ long × 3.5″ deep × 2.25″ high, but the depth you enter should be the dimension that runs vertically in the wall (the brick’s height when laid flat). If you’re using a different brick size (e.g., queen size 7.625″ × 3.5″ × 2.75″), enter those numbers.

Mortar joints are usually 3/8″ (0.375″) but can be 1/2″ (0.5″) for a wider joint or 1/4″ (0.25″) for a tight joint. The joint thickness directly changes the count: thicker joints mean fewer bricks because each brick occupies more wall area. For example, a 20’×8′ wall with 7.5″×3.5″ bricks needs about 755 bricks with a 3/8″ joint, but only 722 with a 1/2″ joint (before waste).

How to Use the Calculator for Real Projects

Measure your wall accurately: length and height in feet (or meters, but convert to feet first). If you have openings like windows or doors, subtract their area from the wall area before calculating bricks. For a full house elevation, measure each wall separately and sum the results. Always add a waste allowance: 5% for simple walls, 10% for walls with corners, cuts, or openings, and 15% if you’re a beginner or the brick pattern is complex (e.g., herringbone).

For a standard 20’×8′ wall, you’ll need 831 bricks with 10% waste. If you’re ordering from a supplier, bricks are often sold per thousand, so you’d order 1,000 to be safe (or 0.831 thousand). For a 10’×10′ wall, the calculator gives 260 bricks with 10% waste (using defaults), so you’d order 300.

Common Mistakes and How to Avoid Them

• Using the wrong brick dimension: The depth in the formula is the vertical dimension when the brick is laid flat, not the brick’s width (the 3.5″ dimension is the width in a standard brick, but it’s the depth when laid). Check how your brick is oriented.
• Forgetting to add the mortar joint: If you skip the joint, you’ll overestimate the brick count by roughly 10–15%.
• Mixing units: Wall in feet, brick in inches – always convert to inches before dividing.
• Ignoring waste: Without waste, you’ll run short due to breakage, cuts at corners, and partial bricks.
• Rounding too early: Don’t round intermediate results; round only the final count up to the next whole brick.

Limitations of the Formula

This calculator gives a close estimate, not an exact count. Real walls have corners, openings, and architectural details that require cutting bricks, and the waste allowance covers those. It also assumes a simple running bond (stretcher) pattern; if you use a more complex pattern like Flemish bond or English bond, you’ll need more bricks because of headers and cut units. The formula doesn’t account for mortar waste (the mortar itself) – that’s a separate quantity. For a precise quote, a mason or supplier will do a detailed takeoff, but this calculator is accurate enough for budgeting and ordering.

Cost Considerations (General)

While this calculator doesn’t provide prices (they vary by region and quality), knowing your brick count helps you estimate cost. Face bricks are sold per thousand, and prices range from a few hundred to over a thousand dollars per thousand depending on color, texture, and manufacturer. You’ll also need mortar mix, which typically covers about 3 cubic feet per 100 bricks for a 3/8″ joint. Use the brick count to calculate mortar bags: one 60-lb bag of mortar mix covers roughly 13 bricks for a 3/8″ joint, but check the bag’s coverage. Always buy a few extra bags to be safe.

Frequently Asked Questions

How many face bricks are in a square foot?

With standard modular bricks (7.5″ × 3.5″) and a 3/8″ joint, you need about 6.5 bricks per square foot of wall (including the joint). That’s derived from the formula: 1 sq ft = 144 sq in, and each brick unit area is 7.875″ × 3.875″ = 30.52 sq in, so 144/30.52 = 4.72 bricks per sq ft without waste. With 10% waste, it’s about 5.2 bricks per sq ft. For a quick estimate, use 5 bricks per sq ft for a standard wall.

What is the difference between face brick and common brick?

Face brick is manufactured to have a uniform, attractive appearance for exposed surfaces, with consistent color and texture. Common brick (or building brick) is less uniform and is used where appearance doesn’t matter, like behind stucco or in structural cores. Face brick costs more but is the standard for visible masonry.

How do I account for windows and doors in the brick count?

Measure the area of each opening (length × height) and subtract it from the total wall area before calculating bricks. For example, a 3’×4′ window is 12 sq ft, so subtract that from the wall area. Then calculate bricks based on the adjusted area. Don’t forget that you’ll still need bricks around the openings (jambs and headers), so it’s common to add back a little waste – 10% is usually enough.

Can I use this calculator for brick veneer?

Yes, face brick is often used as veneer (a single wythe attached to a structure). The calculator works the same way because it counts the face area of bricks. The only difference is that veneer walls are typically 4″ thick (one brick width), but the face area calculation is identical.

What is the best waste percentage to use?

For a simple rectangular wall with no openings, 5% is usually enough. For walls with windows, doors, corners, or complex patterns, use 10%. If you’re a DIYer or the brick is fragile (like some antique bricks), go with 15%. It’s better to have a few extra bricks than to run short – you can always return unopened pallets to some suppliers.

Does the calculator work for metric bricks?

Yes, but you need to convert to inches first. If your brick is 200mm × 100mm, convert to inches (divide by 25.4): 7.87″ × 3.94″. Enter those values. The wall length and height must also be in feet. Alternatively, you can convert everything to meters, but the formula is set for inches and feet.

Related

• Bolt Spacing Calculator: How to Space Bolts
• Bolt Circle Calculator: Pitch Circle Diameter
• Bolt Hole Circle Calculator: Coordinates, Centers

in l | Wall length | ft | 20 | 0
in h | Wall height | ft | 8 | 0
in bs | Brick length | in | 7.5 | 0
in bd | Brick depth | in | 3.5 | 0
in mj | Mortar joint | in | 0.375 | 0
in waste | Waste allowance | % | 10 | 0
out bricks | Bricks needed | bricks | ceil((l*12/(bs+mj)) * (h*12/(bd+mj)) * (1+waste/100)) | 0
out area_sqft | Wall area | sq ft | l * h | 2
out area_sqm | Wall area | sq m | l * h * 0.092903 | 2