Brick & Block Calculator
Bricks or blocks, mortar and wastage for a wall
About Brick & Block Calculator
The brick and block calculator estimates how many masonry units a wall needs. Enter the wall length and height, choose between standard bricks (215 × 102.5 × 65 mm, about 60 per m²) and concrete blocks (440 × 215 × 100 mm, about 10 per m²), subtract openings, and add a wastage percentage for cuts and breakage.
The math assumes a single-skin wall with 10 mm mortar joints — the standard coursing that produces those 60-per-m² and 10-per-m² coverage figures. Alongside the unit count you get the net wall area and a rough mortar volume, estimated at 0.022 m³ per m² for brickwork and 0.011 m³ per m² for blockwork.
It is the quick way to answer “how many bricks do I need” before ordering — for a garden wall, an extension skin, or a blockwork partition — free and instant in your browser. Quantities are estimates: cavity walls, different bonds, and local practice change the numbers, so order with your supplier’s guidance.
How to use Brick & Block Calculator
- Enter the wall length and height in meters.
- Choose the masonry unit: standard brick or concrete block.
- Enter the total area of openings — doors and windows — to subtract, in m².
- Set a wastage percentage for cutting and breakage.
- Read the units needed, the net wall area, and the rough mortar volume.