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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.

  1. 1
    Enter wall dimensions

    Type the height and length of the wall you are building.

  2. 2
    Select brick size

    Choose standard UK bricks (215 x 102.5 x 65mm) or enter custom dimensions.

  3. 3
    Choose wall type

    Select single skin (half brick) or double skin (full brick) wall.

  4. 4
    Review 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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