🧱 Brick Calculator: How Many Bricks Do I Need?
By Shihab Mia · Updated 2026-06-27
Defaults assume a standard US modular brick with an 8 x 2.25 inch face and a 3/8 inch mortar joint, which works out to about 6.55 bricks per square foot (the common rule of thumb of 7). This estimates a single-wythe (one brick thick) wall. The waste allowance covers cuts, breakage, and offcuts.
This brick calculator works out how many bricks you need to build a wall. Enter the wall length and height, confirm the brick face size and the mortar joint thickness, and the tool returns the wall area, how many bricks fit in each square foot, and the total brick count including a waste allowance. The defaults match a standard US modular brick (an 8 x 2.25 inch face with a 3/8 inch joint), which is the familiar rule of thumb of about 7 bricks per square foot.
What is the Brick Calculator?
Estimating bricks starts with two numbers: the area of the wall and the area each brick covers once it is laid. A brick never occupies just its bare face, because every brick carries a mortar joint on one side and along the top. So the space one brick takes up on the wall is the face length plus one joint, multiplied by the face height plus one joint. For a standard modular brick that is (8 + 0.375) x (2.25 + 0.375) = 8.375 x 2.625 = 21.98 square inches. Dividing 144 square inches (one square foot) by that figure gives about 6.55 bricks per square foot, which the trade usually rounds up to 7.
From there the count is straightforward. Multiply the wall length by the wall height to get the gross area in square feet, subtract the area of any doors or windows you are not bricking over, then multiply the net area by the bricks-per-square-foot figure. That is the bare number of whole bricks the wall face needs. This calculator assumes a single-wythe wall, meaning one brick thick (a half brick or 4 inch nominal thickness). A double-wythe or full brick thick wall uses roughly twice as many, so double the result if you are laying two leaves.
No real job uses exactly the calculated number. Bricks snap when cut to fit corners and openings, some arrive chipped, and offcuts rarely get reused. Masons therefore add a waste allowance, usually around 5 to 10 percent, so the order already includes a cushion. Buying a little extra up front is far cheaper and less disruptive than running short near the end and waiting on another delivery, and any sound leftovers are useful for future repairs that match the existing wall exactly.
Bricks are only half the order. Each course sits in mortar, and a rough rule of thumb is about 7 bags of standard mortar mix and roughly 1 ton of sand for every 1,000 modular bricks laid, though larger bricks and thicker joints use more. If you are buying pre-mixed bags instead of mixing your own, plan on roughly 26 to 28 eighty-pound bags per 1,000 bricks. Mortar quantities scale with the number of joints, so anything that raises the brick count (larger walls, smaller bricks, thicker joints) raises the mortar count too. It is worth ordering mortar and sand at the same time as the bricks so the whole job is staged together.
Cost follows directly from the brick count. Common face bricks typically run from about 50 cents to a little over a dollar each delivered, so a single garden wall can land anywhere from a couple hundred to several hundred dollars in materials before mortar, sand, and labor. To budget the job, multiply the total bricks (with waste) by the price per brick, then add the mortar and sand, and finally a labor allowance if you are hiring a mason rather than laying the wall yourself. Bricks are usually sold and palletized in lots (a common pallet holds roughly 500 modular bricks), so your supplier may round the order up to the nearest pallet.
A few practical factors change the final number. Bond pattern matters: a running bond uses the calculated count, while patterns with more cuts (herringbone, basketweave, or any soldier and header courses) waste more brick, so push the allowance toward 10 to 15 percent. Brick paving for a patio or path is estimated the same way but on the ground area rather than a wall face, and pavers are usually laid with tight sand joints rather than 3/8 inch mortar joints, which raises the bricks per square foot. Always confirm the actual face dimensions printed on your supplier datasheet, because nominal and specified brick sizes differ by the joint thickness and using the wrong one throws the estimate off.
When to use it
- Estimating how many bricks to order for a garden wall, retaining wall, or house extension.
- Pricing a masonry job by turning a wall size into a brick count, mortar bags, and a material budget a supplier can quote.
- Checking a builder or contractor estimate before you commit to an order.
- Adjusting for a non-standard brick size, a thicker mortar joint than the usual 3/8 inch, or a double-wythe wall.
- Estimating bricks for a paved patio, path, or driveway by using the ground area instead of a wall face.
- Working out how many pallets of brick to order and roughly how much sand and cement go with them.
How to use the Brick Calculator
- Enter the wall length and height in feet.
- Confirm or change the brick face size (default 8 x 2.25 inches) and the mortar joint (default 3/8 inch).
- Subtract the square footage of any doors or windows in the wall, if needed.
- Set a waste allowance percentage to cover cuts and breakage.
- Read off the total bricks needed, the wall area, and the bricks per square foot.
- Double the result for a full brick thick (double-wythe) wall, and use the brick count to estimate mortar bags and cost.
Formula & method
Worked examples
A 10 ft x 8 ft wall built with standard modular bricks (8 x 2.25 in face, 3/8 in joint) and a 10% waste allowance.
- Brick face with mortar = (8 + 0.375) x (2.25 + 0.375) = 8.375 x 2.625 = 21.98 sq in
- Bricks per sq ft = 144 / 21.98 = 6.55
- Wall area = 10 x 8 = 80 sq ft
- Bare bricks = 80 x 6.55 = 524.0, round up to 525
- With waste = 524.0 x 1.10 = 576.4, round up to 577
Result: About 525 bricks bare, or 577 bricks including 10% waste
A 20 ft x 6 ft wall with a 21 sq ft door opening, standard brick, 5% waste.
- Bricks per sq ft = 6.55 (same standard brick)
- Gross area = 20 x 6 = 120 sq ft
- Net area = 120 - 21 = 99 sq ft
- Bare bricks = 99 x 6.55 = 648.5, round up to 649
- With waste = 648.5 x 1.05 = 680.9, round up to 681
Result: About 649 bricks bare, or 681 bricks including 5% waste
Estimating mortar and cost for a 15 ft x 10 ft single-wythe wall, standard brick, 10% waste, at 0.70 per brick.
- Wall area = 15 x 10 = 150 sq ft
- Bare bricks = 150 x 6.55 = 982.5, round up to 983
- With 10% waste = 982.5 x 1.10 = 1080.8, round up to 1,081 bricks
- Mortar at about 7 bags per 1,000 bricks = 1,081 / 1,000 x 7 = 7.6, round up to 8 bags
- Sand at about 1 ton per 1,000 bricks = about 1.1 tons
- Brick cost = 1,081 x 0.70 = about 757 before mortar, sand, and labor
Result: About 1,081 bricks, roughly 8 bags of mortar and 1 ton of sand, and about 757 in bricks
Common brick sizes and their bricks per square foot (with a 3/8 inch mortar joint)
| Brick type | Face size (in) | Bricks per sq ft |
|---|---|---|
| Modular (standard) | 8 x 2.25 | 6.55 |
| Engineer modular | 8 x 2.75 | 5.50 |
| Closure modular | 8 x 3.625 | 4.30 |
| Roman | 12 x 1.625 | 5.82 |
| Norman | 12 x 2.25 | 4.43 |
| Utility | 12 x 3.625 | 2.91 |
| Queen | 8 x 2.75 | 5.50 |
| UK / metric | 8.5 x 2.6 | 5.62 |
Estimated bricks for a single-wythe wall using a standard modular brick (with 10% waste)
| Wall size | Area (sq ft) | Bricks (bare) | Bricks (with 10% waste) |
|---|---|---|---|
| 10 ft x 8 ft | 80 | 525 | 577 |
| 20 ft x 6 ft | 120 | 787 | 865 |
| 15 ft x 10 ft | 150 | 983 | 1,081 |
| 30 ft x 8 ft | 240 | 1,573 | 1,730 |
Rule-of-thumb mortar and sand per 1,000 standard modular bricks
| Material | Quantity per 1,000 bricks | Notes |
|---|---|---|
| Mortar mix (bagged) | About 7 bags | Larger bricks or thicker joints use more |
| Pre-mixed mortar (80 lb) | About 26 to 28 bags | If not mixing your own |
| Sand | About 1 ton | Paired with cement when mixing on site |
| Portland cement | About 8 bags | With 1 ton of sand for site-mixed mortar |
Common mistakes to avoid
- Forgetting the mortar joint. A brick covers more wall than its bare face because of the mortar around it. Counting only the brick face (without the joint) overestimates the number you need by roughly 15 to 20 percent. Always size the brick by its face plus one joint.
- Ignoring wall thickness (wythes). This tool estimates a single-wythe wall, one brick thick. A double-wythe (full brick thick) wall needs about twice as many bricks, so double the count if you are laying two leaves.
- Not subtracting openings. Doors, windows, and vents do not get bricked over, so their area should be removed from the wall area. Skipping this can lead to ordering hundreds of unnecessary bricks on a large wall.
- Ordering zero spare. Cutting bricks to fit corners and openings breaks some, and a few arrive chipped. A 5 to 10 percent waste allowance avoids a costly second delivery for the last few bricks and leaves matching spares for repairs.
- Forgetting mortar, sand, and cement. Bricks are only part of the order. Each course needs mortar, roughly 7 bags of mix and about 1 ton of sand per 1,000 modular bricks. Buy them with the bricks so the job is not held up halfway through.
- Using the wrong brick size. Nominal and specified brick sizes differ by the joint thickness, and engineer, queen, Roman, and utility bricks all give very different counts. Confirm the actual face dimensions on the supplier datasheet before estimating.
Glossary
- Mortar joint
- The layer of mortar between bricks. A 3/8 inch joint is standard in US modular brickwork.
- Wythe
- A continuous vertical thickness of masonry one brick wide. A single-wythe wall is one brick thick.
- Modular brick
- A standard US brick with an 8 x 2.25 inch face designed so that the brick plus joint fits a 4 inch grid.
- Course
- A single horizontal row of bricks laid in mortar across the length of a wall.
- Waste allowance
- Extra material added to an order, usually 5 to 10 percent, to cover cuts, breakage, and offcuts.
- Bond pattern
- The arrangement of bricks in a wall, such as running, stretcher, or herringbone. Patterns with more cuts waste more brick.
- Nominal size
- A brick size that includes the mortar joint, as opposed to the specified (actual) size of the brick itself.
- Pointing
- Finishing or refilling the surface of mortar joints between bricks for weatherproofing and appearance.
Frequently asked questions
How many bricks do I need per square foot?
For a standard US modular brick (an 8 x 2.25 inch face) with a 3/8 inch mortar joint, you need about 6.55 bricks per square foot of wall, which the trade rounds up to 7. The exact figure changes with the brick size and joint thickness, so this calculator computes it from the dimensions you enter.
How many bricks are in a square meter?
A single-leaf wall of standard UK metric bricks (215 x 65 mm with a 10 mm joint) needs about 60 bricks per square meter. For US modular bricks the figure is around 70 per square meter. Multiply the wall area in square meters by that rate, then add 5 to 10 percent for waste.
Does this include the mortar joint?
Yes. The calculator sizes each brick as its face length plus one joint by its face height plus one joint, so the mortar around every brick is already accounted for. That is why the count is lower than dividing the wall area by the bare brick face alone.
Is this for a single or double thickness wall?
The estimate is for a single-wythe wall, meaning one brick thick (about a 4 inch nominal thickness). For a double-wythe or full brick thick wall, you need roughly twice as many bricks, so double the result the tool gives you.
How much waste should I add?
A waste allowance of 5 to 10 percent is typical. It covers bricks broken while cutting to fit corners and openings, chipped bricks in the delivery, and offcuts that cannot be reused. Push it toward 10 to 15 percent for walls with lots of curves, angles, openings, or a cut-heavy bond pattern.
How much mortar and sand do I need?
A common rule of thumb is about 7 bags of mortar mix and roughly 1 ton of sand for every 1,000 standard modular bricks, or about 26 to 28 eighty-pound bags of pre-mix if you are not mixing your own. Larger bricks and thicker joints use more, so scale up with the brick count.
How much does it cost to build a brick wall?
Multiply the total bricks (including waste) by the price per brick, which commonly runs from about 50 cents to a little over a dollar each delivered, then add mortar, sand, and a labor allowance if you are hiring a mason. A typical garden wall can land anywhere from a couple hundred to several hundred dollars in materials.
What brick size should I use?
The default is a standard US modular brick at 8 x 2.25 inches, the most common size. If your supplier uses a different brick (engineer, queen, Roman, or utility, for example), enter its actual face length and height and the tool recalculates the bricks per square foot for you.
How do I work out the wall area?
Multiply the wall length by its height to get the gross area in square feet, then subtract the area of any doors, windows, or vents that will not be bricked over. The calculator does this when you enter the dimensions and the openings figure.
How many bricks are on a pallet?
A common pallet holds roughly 500 standard modular bricks, though the exact count varies by brick type and supplier. Because bricks are sold in pallet lots, your supplier may round the order up to the nearest pallet, so it is worth checking the pallet size when you place the order.