Loona Construction Calculators
Building a wall, extension or garden feature? Enter the wall length and height and choose your brick — standard metric brick with 10 mm mortar joints, or US modular brick with ⅜-inch joints — and get the brick count for a single-skin (half-brick) wall, waste included.
About 60 standard bricks (215 × 65 mm) per m² of single-skin wall including 10 mm mortar joints — 59.3 before waste. A double-skin wall needs about 120 per m².
US modular bricks: about 6.86 per ft² of single-skin wall with ⅜ in joints. US standard (8 in) bricks: about 6.55 per ft². Both figures include the mortar joint.
For one or two small openings, no — the bricks around openings involve cuts and the waste allowance absorbs them. For large openings (garage doors, big windows), subtract their area from the wall before calculating.
Bricks = Wall area × Bricks per unit area × (1 + Waste %)
Bricks per unit area come from the brick face plus one mortar joint: a standard 215 × 65 mm brick with a 10 mm joint occupies 225 × 75 mm, giving 59.3 bricks per m². A US modular brick (7⅞ × 2¼ in) with a ⅞ in joint occupies 8 × 2.625 in, giving 6.86 bricks per ft²; a US standard 8 in brick gives 6.55 per ft².
As a rough guide, a single-skin wall in standard brick uses about 0.03 m³ of mortar per m² of wall (roughly 25–30 kg of dry mix per m²). Mortar depends heavily on joint thickness and brick absorption, so treat this as an estimate.
Bricks get cut at ends and openings, some arrive chipped, and a few break in handling. 10% is standard; keep leftovers for future repairs — reclaimed matching bricks are hard to find later.
The same method applies: a standard 440 × 215 mm block with a 10 mm joint works out at about 9.9 blocks per m². Enter your wall, choose the standard brick count as a rough guide only — for blocks, divide the wall area by 0.099 m² per block instead.
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