Brick Calculator
Estimate bricks needed for your wall
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Result
Ready to calculate...
What this calculator does
Estimates how many bricks a straight wall needs from the wall size, the brick face and the mortar joint.
How to use it
- Enter wall width and height.
- Enter brick length and height and the mortar joint thickness.
- Add a waste margin for cuts and breakage.
Formula
Net Wall Area = Width × Height brickAndJointFaceArea = (Brick Length/100 + Mortar Thickness/1000) × (Brick Height/100 + Mortar Thickness/1000) bricks = roundUp( Net Wall Area / brickAndJointFaceArea × (1 + Waste Margin (%) / 100) )
Formulas are shown in metric units, exactly as the calculator computes them. Imperial entries are converted to metric first. Waste is applied as a multiplier (1 + waste/100).
Areas are in m² and volumes in m³. Centimeters are divided by 100 to give meters. Millimeters are divided by 1,000 to give meters. RoundUp means the next whole piece or bag.
Variables
| Variable | Unit | Default |
|---|---|---|
| Width | m | 5 |
| Height | m | 2.5 |
| Brick Length | cm | 21.5 |
| Brick Height | cm | 6.5 |
| Mortar Thickness | mm | 10 |
| Waste Margin (%) | % | 10 |
Worked example
Using the default values of this calculator (Width = 5 m, Height = 2.5 m, Brick Length = 21.5 cm, Brick Height = 6.5 cm, Mortar Thickness = 10 mm, Waste Margin (%) = 10 %), the calculator returns:
Net Wall Area = 5 × 2.5 brickAndJointFaceArea = (21.5/100 + 10/1000) × (6.5/100 + 10/1000) bricks = roundUp( Net Wall Area / brickAndJointFaceArea × (1 + 10 / 100) )
- Bricks Needed: 815 bricks
Assumptions and limitations
- Openings are not subtracted and brick depth (wall thickness) is not used: the result is for a single face of bricks.
- Bond pattern, corners and half bricks are not modelled.
Waste, rounding and buying
Bricks are sold in pallets or thousands; round up and check that all bricks come from one production batch for consistent colour.
Frequently asked questions
- Does the calculator subtract windows and doors?
- No. Subtract their area yourself, or take the net area from the Wall Area calculator and enter an equivalent width and height.
- Is mortar included in the brick size?
- The joint is added to both brick length and height, so each brick occupies its face plus one joint.