Brick and block calculator

Count bricks or aerated concrete blocks for a wall, and the mortar to lay them.

m
m
m²
mm
mm
More settings
%
Bricks or blocks765 pcs

Shopping list

  • Bricks or blocks765 pcs
  • Mortar0.284 m³

How we got there

Wall area without openings
14.2 m²
Units per m²
51.3 pcs

Results are estimates. Always check the consumption printed on the product you buy.

How it is calculated

The calculator takes the wall area minus doors and windows and finds how many units fit in one square metre including the joint. A reserve covers broken and cut units. The mortar volume is the wall volume minus the volume of the units themselves.

FormulaUnits per m² = 1 ÷ ((length + joint) × (height + joint))Units = net area × units per m² × (1 + reserve)Mortar = wall volume − units × unit volume

Example

A wall 6 m long and 2.7 m high with 2 m² of openings, built from 250 × 65 mm bricks with 10 mm joints, needs 765 bricks with a 5 % reserve and about 0.28 m³ of mortar for a 120 mm wall.

Tips from practice

  • Aerated blocks are laid on thin-bed adhesive with 2–3 mm joints: enter 3 mm.
  • Buy all face bricks from one batch: the colour varies between batches.
  • Keep the wall thickness equal to the brick or block width you build with.

Questions and answers

How many bricks are in one square metre?

About 51 bricks of 250 × 65 mm with 10 mm joints in a single-brick-wide (120 mm) wall.

How many aerated blocks per m²?

With 600 × 200 mm blocks and 3 mm joints, about 8.2 blocks per square metre.

How much mortar per m² of brick wall?

For a 120 mm wall, about 0.02 m³ (20 litres) per square metre.

Found a mistake in a formula? Write to [email protected]