How many bricks do I need per square foot?

A standard modular brick with a 3/8-inch mortar joint works out to about 6.9 bricks per square foot of wall face. The exact number depends on the brick's face size and the joint width, since each brick effectively occupies its own size plus the mortar around it. Enter your brick and joint and the calculator finds the rate for you.

How do I calculate bricks for a wall?

Find the wall's face area, subtract any doors and windows, and multiply by the bricks per square foot for your brick and joint size. Then add roughly 10 percent for cuts and breakage and round up. For a single-wythe brick veneer, that face area is all you need.

Does the mortar joint change the brick count?

Yes. A wider joint means each brick covers more wall, so you need fewer bricks — but more mortar. A 3/8-inch joint is standard for many bricks, while some use 1/2 inch. The joint is added to both the brick's length and height when working out how much wall each brick occupies.

Brick Calculator — How Many Bricks You Need

Formula & how it works

Each brick occupies its face plus the joint: module = (face length + joint) × (face height + joint) in². Bricks per ft² = 144 ÷ module.

Bricks = net wall area × bricks per ft² × (1 + waste), rounded up. Net area is wall length × height minus openings.

Worked example

A 10 × 8 ft wall is 80 ft². A modular brick (7⅝ × 2¼ in) with a ⅜ in joint occupies 8 × 2⅝ = 21 in², so 144 ÷ 21 ≈ 6.86 bricks per ft². That's about 549 bricks; with 10% waste, buy 604. Cut a 30 ft² door and window out of a bigger wall and the count drops in step.

Getting the brick count right

Face size and joint do the work

Bricks are sized by their nominal name but sold at a specific actual face, and different makers vary. The mortar joint matters just as much: it's added to both dimensions, so a wider joint spreads each brick over more wall and lowers the count. Enter the real face size and your planned joint rather than a rule of thumb, and the per-square-foot rate updates to match.

Subtract the openings, then add waste

Doors, windows, and other openings don't get bricked, so take their area out of the wall first. Then add waste for the cuts at corners, jambs, and the ends of courses, plus the odd broken brick — 10% is typical, more for a cut-up wall with lots of openings. Order a little extra from the same batch so the color matches if you need spares later.

Veneer, not structure

This tool counts a single layer of brick facing — the common veneer or garden-wall case. A load-bearing or multi-wythe brick wall involves structural design, ties, and bond patterns that are outside a simple area count, so treat those as an engineered job. And because mortar is bought separately, pair this with a mortar estimate once you've settled the brick count.

Brick Calculator

Worked example

Getting the brick count right

Face size and joint do the work

Subtract the openings, then add waste

Veneer, not structure

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