Bricks per square metre depend on the visible brick dimensions, mortar joints and bond. The following estimate applies to a single flat leaf of masonry with the long brick faces visible.
Calculate the repeating face module
Add the head joint to the brick length and the bed joint to its height. A 210 × 50 mm face with 10 mm joints gives a 220 × 60 mm module. The brick depth through the wall is not part of this face area.
Divide one square metre by that area
One square metre is 1000 × 1000 = 1,000,000 mm². The module covers 220 × 60 = 13,200 mm². Divide 1,000,000 by 13,200 to get about 75.76 bricks per m². Round after multiplying by the wall area. Another brick format or joint size produces another count.
1 000 000 ÷ ((210 + 10) × (50 + 10)) ≈ 75.76
Calculate net wall area
Multiply width by height in metres, then subtract openings. For 10 m² net area, this example gives 10 × 75.76 ≈ 758 bricks before any separate allowance for breakage and cutting waste. Show that allowance separately from the base quantity. Edges, bonds and cut pieces can change the actual order.
Count arches and special masonry separately
An arch contains cut pieces with different profiles. An area formula cannot tell you how many whole bricks those pieces require. Use the brick layout and piece dimensions from the relevant BrickCore workshop for the arch. This article explains a flat-wall estimate; it does not replace an arch cutting schedule.