Brick Wall Calculator
Estimate the number of bricks and the mortar volume for a brick wall from its length, height, and thickness. The calculator works out the wall volume, applies a standard brick density, and adds a 5% wastage allowance.
Formula
Volume = L×H×T; BricksPerM³ = 1/(0.24×0.125×0.085)≈393; Total = Volume×393×1.05
- Wall volume = length × height × thickness, where thickness depends on whether the wall is half, one, or one-and-a-half bricks deep.
- A standard brick with mortar occupies about 0.24 × 0.125 × 0.085 m, giving roughly 393 bricks per cubic metre.
- Multiplying volume by 393 and then by 1.05 adds a 5% wastage allowance for breakage and cutting.
- Mortar is estimated at about a third of the wall volume — a common rule of thumb for standard joints.
- Openings such as doors and windows are not deducted; subtract their area separately for accuracy.
5 m × 3 m one-brick wall
Inputs
- Wall Length: 5 m
- Wall Height: 3 m
- Mortar Joint: 0.01 m
Volume = 5 × 3 × 0.23 = 3.45 m³. Bricks = 3.45 × 393 × 1.05 ≈ 1,424 bricks, with about 1.14 m³ of mortar.
Frequently asked questions
How many bricks are in a cubic metre?
For a standard brick laid with mortar, roughly 393 bricks fill one cubic metre of wall.
What does wall thickness mean here?
Half brick (115 mm) is a single-leaf partition, one brick (230 mm) is a full load-bearing wall, and one-and-a-half brick (345 mm) is thicker still.
How much mortar will I need?
Mortar typically makes up about a third of the wall volume. This calculator estimates that for you alongside the brick count.
Is wastage included?
Yes. A 5% allowance is added to cover breakage and cutting. Increase your order further for complex walls with many cuts.
Are doors and windows deducted?
No. Calculate the volume of large openings and subtract their bricks separately for an accurate total.