Calculate brick or block quantities and mortar for a masonry wall.
Masonry is set out on the module size rather than the unit size, because each unit carries one joint with it. Mortar volume follows from the difference between the module area and the unit face area. Ignoring the joint overstates unit counts by around 15 per cent on standard brick, which is the difference between one delivery and two.
Brick/Block
Units per m² = 1 ÷ ((length + joint) × (height + joint)); mortar fills the remainder
Units per m² = 1 ÷ ((length + joint) × (height + joint)); mortar fills the remainder Masonry is set out on the module size rather than the unit size, because each unit carries one joint with it. Mortar volume follows from the difference between the module area and the unit face area.
Ignoring the joint overstates unit counts by around 15 per cent on standard brick, which is the difference between one delivery and two.
This calculator takes 5 inputs: Wall area, Unit length, Unit height, Mortar joint thickness, Waste allowance. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.