Brick & Block Calculator

Calculate number of bricks or blocks for a wall with mortar volume, door/window deductions and wastage allowance.

Wall Type

Wall length

Wall height

Doors (900×2100)

Windows (1200×1200)

Mortar joint

Wastage allowance

Gross Area

—

m²

Net Area

—

m²

Units / m²

—

Total Units

—

with wastage

Mortar Volume

—

m³

Mortar Bags (25 kg)

—

UK Standard 215 × 102.5 × 65 mm

Modular 190 × 90 × 57 mm

Queen 245 × 120 × 57 mm

Engineer 215 × 102.5 × 73 mm

M2 (1:1:5.5) General purpose

M4 (1:1:4) Below DPC

M6 (1:0.5:3) Exposed / high strength

M12 (1:0.25:3) Engineering brickwork

Standard UK bricks: approximately 60 bricks per m² (half-brick wall, 10 mm joints). Standard blocks: approximately 10 blocks per m².