Brickwork & blockwork calculator

How it works out the quantities

1. 1Standard UK bricks (215 × 102.5 × 65 mm) lay at 60 per m² in stretcher bond with 10 mm joints; a half-brick wall of 10 m² needs 600 bricks before waste.
2. 2English bond uses about 89 per m² and Flemish about 79 per m² for a one-brick-thick wall, because of the headers.
3. 3Concrete blocks (440 × 215 mm) lay at 10 per m²; courses are 225 mm high for both brick (3 courses) and block (1 course).
4. 4Mortar is estimated per m² — around 0.02–0.03 m³ for brickwork — and converted to cement bags and sand for the ratio you choose.

Site tips before you order

• Allow 5% waste on facing bricks and 10% on blocks that will be cut around openings.
• Order all facing bricks from one batch to avoid colour banding — the calculator's total helps you place one order.
• Don't forget lintels, cavity closers, wall ties, DPC and weep vents on the quote — they're not in the brick count.
• For retaining walls or anything structural, get the specification checked; the calculator gives quantities, not design.