Brick Calculator
Brick Calculator
Building a brick wall starts with one practical question: how many bricks do I need? Order too few and the job stalls; order too many and you waste money on surplus you may not be able to return. Our Brick Calculator estimates the number of bricks required for a rectangular wall from its length, height, the brick size, the mortar joint thickness, and a waste allowance. It is useful for homeowners planning a garden wall, masons bidding a job, and students learning construction estimation.
Why Estimate Accurately?
Bricks are sold in pallets or by the thousand, and colors vary slightly between production runs, so it is best to buy everything in one order. A good estimate with a sensible waste margin avoids mismatch and repeat trips to the supplier.
What Affects the Count?
The number of bricks depends on the wall area, the brick face dimensions, the mortar joint (which adds to each brick's footprint), and openings like doors or windows. This calculator handles a solid rectangular wall; subtract openings separately if needed.
Brick sizes you will encounter
Most US residential work uses a "modular" brick whose specified face is 7⅝ in long by 2¼ in high (3⅝ in wide). Add a 3/8 in mortar joint on every side and the coursing works out to a clean 8 in by 2⅔ in module. Other common sizes include the "standard" brick (8 × 2¼ in), the "queen" (7⅝ × 2¾ in), the "engineer modular" (7⅝ × 3⅛ in), and the large "utility" brick (11⅝ × 3⅝ in). A single 3/8 in joint on a modular brick yields about 6.75 bricks per square foot of wall face; a queen yields about 5.5, and a utility only about 3.0. Entering the exact face dimensions keeps the estimate honest rather than relying on a rule of thumb.
Mortar and the joint
The joint is not wasted space — it is what bonds the wall and it enlarges every brick's footprint. A tighter 1/4 in joint packs more bricks into a square foot (about 7.3 for modular), while a looser 1/2 in joint drops coverage to about 6.4. Most masons aim for a consistent 3/8 in struck joint for both strength and appearance. Because the joint changes the math, this calculator adds it automatically, so you should measure your actual brick rather than guess.
Enter the wall dimensions and optional brick details, then click Calculate.
- Enter Wall Length in feet.
- Enter Wall Height in feet.
- Enter Brick Length in inches (default 8 in, a standard modular brick).
- Enter Brick Height in inches (default 2.25 in).
- Enter Mortar Joint in inches (default 0.375 in, a common 3/8 joint).
- Enter Waste percentage (default 5%).
- Click Calculate for the brick count and wall area.
Worked Example 1: A 20 ft × 8 ft Wall
Wall area = 20 × 8 = 160 ft². Brick face with mortar = (8 + 0.375) × (2.25 + 0.375) = 8.375 × 2.625 = 21.98 in² = 0.1526 ft². Bricks = 160 / 0.1526 ≈ 1048, plus 5% waste → about 1101 bricks.
Worked Example 2: A Small Planter 6 ft × 3 ft
Wall area = 18 ft². Bricks = 18 / 0.1526 ≈ 118, plus 5% → about 124 bricks.
Edge Cases
- Zero wall size → no result (a wall needs positive area).
- Very large walls → the count scales linearly with area.
- Thicker mortar → fewer bricks per square foot.
- Non-standard bricks → enter your actual dimensions; the formula adapts.
- Openings → subtract their area from the wall area before estimating, or reduce the count proportionally.
Worked Example 3: A Wall With a Door and Two Windows
Suppose a 30 ft × 10 ft wall (300 ft²) uses modular brick. A 3 ft × 7 ft door and two 3 ft × 4 ft windows remove 21 + 12 + 12 = 45 ft², leaving 255 ft² of net wall. Bricks = 255 / 0.1526 ≈ 1671, plus 7% waste → about 1787 bricks. Ignoring the openings would have overshot the order by roughly 300 bricks. Always deduct openings before ordering.
Worked Example 4: A Double-Wythe Garden Wall
A 16 ft × 3 ft wall is 48 ft² of face, but a double-thickness wall presents two wythes, so total brick face area is 96 ft². Bricks = 96 / 0.1526 ≈ 629, plus 5% → about 660 bricks, and you will also need wall ties roughly every 2.67 ft² of wall to lock the two wythes together.
Thin vs thick joints at scale
On a 200 ft² wall, switching the joint from 3/8 in to 1/2 in lowers the per-square-foot coverage from 6.55 to 6.26 bricks, a difference of about 58 bricks — enough to matter on a pallet order. Small parameter changes compound across large walls, which is why accurate inputs beat shortcuts.
Worked Example 5: A 40 ft × 9 ft Garage Gable Wall
A 40 ft × 9 ft wall is 360 ft² of face. With modular brick at a 3/8 in joint (0.1526 ft² each), the raw count is 360 / 0.1526 ≈ 2,359 bricks. Add a 7% waste margin for corners and a row of header bricks at the bond line and the order rises to about 2,524 bricks. At roughly 500 bricks per pallet, that is five full pallets plus a partial sixth — confirming why you should order by the pallet, not by the brick.
Worked Example 6: Comparing Waste Margins Side by Side
Take a 160 ft² wall that needs 1,048 bricks before waste. At 5% waste you order 1,101; at 8% you order 1,132; at 10% you order 1,153. The jump from 5% to 10% is only 52 bricks, but on a large 1,000 ft² wall the same spread is 327 versus 343 versus 350 bricks — a 23-brick difference that costs little yet covers far more cutting loss. When a wall has many corners, window sills, or a soldier-course cap, lean toward 10%.
First compute the wall area and the brick footprint including mortar:
where dimensions are in inches and the division by 144 converts square inches to square feet. The brick count with waste w is:
The ceiling function rounds up because you cannot buy a fraction of a brick.
Bricks per square foot for common brick-and-mortar sizes:
| Brick (in) | Mortar (in) | Brick Area (ft²) | Bricks per ft² |
|---|---|---|---|
| 8 × 2.25 | 0.375 | 0.1526 | 6.55 |
| 8 × 2.25 | 0.5 | 0.1597 | 6.26 |
| 7.625 × 2.25 | 0.375 | 0.1495 | 6.69 |
| 8 × 3.625 | 0.375 | 0.1918 | 5.21 |
| 9.5 × 2.75 | 0.375 | 0.2028 | 4.93 |
A longer or taller brick (or thicker joint) covers more area, so fewer bricks are needed per square foot.
Brick coverage by joint thickness (standard 8 × 2.25 brick, bricks per ft²):
| Mortar (in) | Brick Area (ft²) | Bricks per ft² |
|---|---|---|
| 0.25 | 0.1493 | 6.70 |
| 0.375 | 0.1526 | 6.55 |
| 0.50 | 0.1597 | 6.26 |
Brick count for a 5% waste margin at various wall areas (standard 8 × 2.25 brick, 3/8 joint):
| Wall Area (ft²) | Bricks Needed |
|---|---|
| 32 | 221 |
| 64 | 441 |
| 120 | 827 |
| 160 | 1101 |
| 240 | 1651 |
Count grows linearly with wall area; the ceiling and waste margin add a few bricks at each size.
- Add 5-10% waste for cuts, breakage, and future repairs.
- Measure twice: small errors in wall length or height multiply across the whole wall.
- Account for openings: subtract door and window area before estimating.
- Buy from one batch: color varies between production runs.
- Check local brick size: modular bricks are common in the US, but sizes differ internationally.
- Round up: always order the ceiling of the estimate plus waste.
- Rectangular walls only: curved or stepped walls need sectional estimates.
- No openings: doors and windows are not subtracted automatically.
- Single wythe: assumes one brick thick; double-thickness walls double the count.
- Uniform mortar: assumes a constant joint, though real joints vary slightly.
- No bond pattern waste: complex bonds (English, Flemish) may need extra cutting allowance.
- US units: length and height in feet, brick dimensions in inches.
How many bricks per square foot?
For a standard 8 × 2.25 in brick with a 3/8 in mortar joint, about 6.5 bricks cover one square foot.
Do I subtract mortar when counting bricks?
Yes. The mortar joint increases each brick's effective footprint, so fewer bricks fit per square foot. This calculator includes it automatically.
How much waste should I add?
Typically 5-10%. Use the higher end for walls with many cuts or corners.
What if my bricks are a different size?
Enter your brick's actual length and height in inches; the calculator adapts the count.
How many bricks for a 100 square foot wall?
With a modular brick at a 3/8 in joint, plan on about 675 bricks per 100 ft² before waste, so roughly 710–730 after a 5–10% allowance.
Does the bond pattern change the count?
Running bond and stack bond use the basic count. Pattern bonds with header courses (English, Flemish, common) add 17–50% more brick because headers are full units turned into the wall, so add a bond factor if your design uses them.
How much mortar will I need?
As a rough field rule, about 8 bags of masonry cement lay 1,000 modular bricks, or roughly 30–37 ft³ of wet mortar per 1,000 brick. Plan 15–25% extra mortar for waste on cut-heavy walls.
Can I estimate a circular or curved wall?
Break it into short rectangular chords, estimate each, and sum. Curved walls also need more cutting waste, so push the waste allowance toward 10%.
Does this include the foundation or footing?
No. It estimates facing bricks for the wall surface only.
How do I account for a door?
Subtract the door's area from the wall area, then estimate, or reduce the final count proportionally to the opening.
Can I use metric units?
This version uses feet and inches. Convert your metric dimensions to feet/inches first.
Why does the result round up?
You cannot purchase a fraction of a brick, so the estimate rounds up to a whole brick.
Does wall thickness matter?
This calculator assumes a single brick thickness. A double-thickness wall needs roughly twice the bricks.
Should I include a waste percentage for a small wall?
Yes, even small walls need cuts at corners and ends, so 5-10% is still wise.
How many bricks come on a pallet?
A standard US pallet of modular brick holds about 500 bricks, though it varies by manufacturer and brick size. Once you know the total, divide by 500 and round up to plan pallet deliveries and returns.
What is a soldier course and does it change the count?
A soldier course lays bricks vertically (standing on end) as a decorative top row or above openings. Because each standing brick presents its short face, the per-foot count differs from the running field; estimate those rows separately and add them to the field total.
How do I handle a wall with a row of headers?
Header rows (bricks turned face-out to tie two wythes) are full units placed at intervals, not partial bricks. If your bond calls for a header every sixth course, add one header per 6 ft of wall length per header course to the running total.
Last updated: July 18, 2026
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