Brick Calculator
Calculate how many bricks you need for a wall, plus mortar, cement, and sand quantities. Supports stretcher and Flemish bond with customisable wastage allowance.
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How to use this brick calculator
Estimate the number of bricks needed for a wall based on dimensions. Accounts for mortar joints and different brick sizes.
- 1Enter wall dimensions
Type the height and length of the wall you are building.
- 2Select brick size
Choose standard UK bricks (215 x 102.5 x 65mm) or enter custom dimensions.
- 3Choose wall type
Select single skin (half brick) or double skin (full brick) wall.
- 4Review the estimate
See the total bricks needed, including a 5-10% wastage allowance.
Why this matters
Ordering the right number of bricks saves money and avoids delays. Too few and you are waiting for a second delivery mid-job. Too many and you are stuck with pallets of unused stock. This calculator gives you an accurate estimate with wastage built in.
Frequently asked questions
How many bricks do I need per square metre?
For a standard stretcher bond (half-brick wall), you need approximately 60 bricks per m². For a Flemish bond (one-brick wall), you need approximately 120 bricks per m². Always add 10% for wastage from cutting and breakage.
How much mortar do I need per m² of brickwork?
For a half-brick wall in stretcher bond, you need approximately 0.03m³ of mortar per m² of brickwork. This translates to roughly 6 bags of cement (25kg each) per m³ of mortar, mixed with sharp sand at a 1:5 or 1:6 ratio.
What is the standard UK brick size?
The standard UK brick is 215mm × 102.5mm × 65mm. With a standard 10mm mortar joint, the coordinating size becomes 225mm × 112.5mm × 75mm. Engineering bricks are the same dimensions but denser and stronger.
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