How Many Bricks Do I Need?

Multiply your wall's length by its height to get the face area in square feet, then multiply by 7— the standard coverage for modular brick with a 3/8" mortar joint. Add 10% for waste and round up. That covers a plain wall with no openings; for a wall with doors, windows, a non-standard brick size, or a different waste allowance, the brick calculatordoes the same math with those adjustments built in. This page is the reasoning behind that number, plus reference figures for a few common project sizes and one fully worked example for a shape that isn't a flat wall.

Why 7 bricks per square foot

Standard US modular brick measures 7-5/8" long by 2-1/4" high on its face. Laid with a 3/8" mortar joint on every side, each brick occupies a nominal 8" × 2-2/3" module of wall — about 21.3 square inches including its share of the joint — which works out to just under 7 bricks per square foot. Brick coverage convention (7 bricks/sq ft, modular brick with 3/8" joint): The Home Depot brick estimating guide; sizing per Brick Industry Association Technical Note 10 is the number every major retailer and masonry guide converges on, and it already accounts for the mortar joint — you don't add anything separately for that (the mortar itself is a separate purchase; the mortar calculator turns a brick count into bags). It assumes running bond (the common pattern, every brick showing its long face) and standard modular sizing; queen, king, utility, or metric-format brick cover different areas per unit.

Typical brick counts by project

The figures below use the same method — face area × 7, plus 10% waste — for a few common project shapes, so you can get a ballpark before you measure anything. None of these subtract door or window openings; a real wall with openings needs fewer bricks than its raw area suggests, which is exactly what the calculator's opening fields are for.

A whole-house figure like the last row is almost always an overestimate in practice, since it doesn't subtract any doors or windows — run your actual wall-by-wall dimensions through the brick calculator once you have them, and expect the real number to land somewhat below the raw-area figure here.

A full example: a brick pillar or mailbox column

Walls aren't the only thing brick covers, and a pillar needs a different approach because it has four faces instead of one. Take a mailbox column or small pier with a 12" × 12" footprint, standing 4 ft tall above grade: each of its four faces is 1 ft wide by 4 ft tall, or 4 square feet, and 4 faces × 4 sq ft = 16 square feet of total face area. At 7 bricks per square foot, that's 16 × 7= 112 bricks, and with the standard 10% waste allowance, 112 × 1.1 = 123.2 — round up to 124 bricks to buy. This slightly over-counts, because each corner brick technically serves two faces at once; for a structure this small the difference is a handful of bricks, well inside the waste allowance already built in. The same face-by-face approach scales up to a chimney or a larger pier — sum each face's area before applying the rate, and lean on the higher end of the waste range, since a four-sided structure generates proportionally more corner cuts than a flat wall.

Bricks per square foot for other US brick sizes

The 7-per-square-foot figure only holds for modular brick. The same method (face size plus a 3/8" joint, divided into 144 square inches) gives the rate for the other common US sizes, which you can enter in the calculator's coverage field:

Larger bricks mean fewer units, but not proportionally fewer dollars: a larger brick usually costs more each. Compare quotes per square foot of wall (unit price × bricks per square foot), not per brick. Face sizes vary a little by plant, so confirm the dimensions on the supplier's spec sheet before using a rate from this table.

UK 215 × 65 mm brick with a 10 mm joint: ≈59 bricks per m² (≈60 rounded up). That is its own calculation, not a conversion of the table above; the workings are in the bricks-per-square-metre section below.

Plan wall sizes in whole bricks

Modular brick is laid so that three courses (rows) make 8" of height, and each brick plus its joint takes 8" of length. Walls planned in those steps go up without cutting bricks lengthwise or trimming a sliver off the top course. The 2.5 ft garden wall in the table above is 30" tall, which is 11.25 courses. On site that becomes either 11 courses (about 29.3") or 12 courses (32"). Choosing the height up front changes the count by one full course along the whole wall. For length, a 12 ft wall is exactly 18 bricks per course, while a wall 12 ft 3 in long needs a cut piece in every course. Where a design allows, adjust dimensions by an inch or two to land on the 8" grid; masons call this "modular planning," and it saves both bricks and cutting time.

Capping a garden wall

The face-area rate counts the wall itself, not the top. A freestanding garden or planter wall usually gets a cap course, often bricks set on edge across the wall (a rowlock course). Those bricks show their 2-1/4" side along the wall, so with a 3/8" joint each one takes 2-5/8" of length, which is about 4.6 bricks per linear foot. The 12 ft planter wall in the table needs about 12 × 4.6 ≈ 55 more bricks for a rowlock cap, before waste. A cap laid flat across a double-wythe wall uses a different count again, and stone or precast caps replace the bricks entirely. Decide on the finish before ordering, because the cap is often the first course people forget.

Metric and UK brick counting (bricks per square metre)

Everything above uses US modular brick and imperial units. UK and metric-market brick is sized differently, so the per-area rate is different too — not a unit conversion of the 7-per-square-foot figure, but its own calculation from the metric brick's own dimensions. Standard UK brick measures 215mm long × 102.5mm wide × 65mm high on the stretcher face, and with a standard 10mm mortar joint on every side, each brick occupies a 225mm × 75mm module on the wall face (215mm brick + 10mm joint, by 65mm brick + 10mm joint) — 16,875 square millimetres per brick. One square metre is 1,000,000 square millimetres, so 1,000,000 ÷ 16,875 ≈ 59.3 bricks per square metre for a single-skin (half-brick, stretcher-bond) wall — the well-known UK "60 bricks per square metre" trade rule of thumb: Brick Development Association / UK builders-merchant estimating guidance rounds this up to a flat 60 for quick on-site estimating; the more precise figure from the arithmetic above is 59.3, and this page uses that unrounded figure for the reference table below so the waste allowance isn't compounded on top of an already-rounded rate. A double-skin (full-brick, cavity) wall needs roughly double this count minus whatever the tie spacing and cavity affect — treat the single-skin rate as the per-leaf figure and calculate each leaf separately.

As with the imperial table above, these figures are raw wall-face area with no doors or windows subtracted, so a real wall needs fewer bricks than its footprint area alone suggests. The 59.3-per-square-metre rate assumes standard UK brick (215 × 102.5 × 65mm) and a 10mm joint; metric brick sizes vary by manufacturer and market outside the UK, so confirm your supplier's actual dimensions before relying on this rate for a large or expensive order — the same caution the imperial size table above gives for non-modular US brick. Mortar for the wall is a separate quantity, estimated with the mortar calculator.

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