Brick Calculator: How Many Bricks Does Your Wall Need?

Enter the wall size, its thickness, the area of doors and windows and the brick type. You get the number of bricks with wastage, and the cement and sand for 1:6 mortar.

FreeNo sign-upRuns in your browserUpdated 2 Nov 2026
115 mm is half a brick, 230 mm a full brick.
In the square of the chosen unit, for example sq ft.
%
Your resultLive

Estimates only. Check important results before you rely on them.

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How to use this calculator

  1. Choose feet or metres and enter the wall length and height.
  2. Enter the wall thickness and the area of openings.
  3. Pick a brick type. Modular is 190 × 90 × 90 mm, traditional is 230 × 110 × 70 mm.
  4. Read the bricks needed, plus mortar cement and sand.

The formula

Wall volume = (Length × Height − Openings) × Thickness. Bricks = Wall volume ÷ Volume of one brick with its mortar joint (10 mm). Mortar = Wall volume − Bricks × Volume of one brick. Dry mortar = Mortar × 1.27, for a 1:6 mix.

Worked example

A 20 ft × 10 ft wall, 230 mm thick, with 30 sq ft of openings has 170 sq ft (15.79 m²) of brick area and a volume of 3.633 m³. With modular bricks that is 1,817 bricks, or 1,908 with 5% wastage. The mortar is 0.837 m³, needing about 5 bags of cement and 0.91 m³ of sand.

Understanding your result

Brick size varies by region, so check what your supplier sends. Use the custom option to enter the real size. Add more wastage for hand-cut or breakable bricks.

When to use it

  • Order the right number of bricks for a boundary or house wall.
  • Compare modular and traditional brick quantities.
  • Plan mortar cement and sand with the bricks.

Assumptions and limits

These are planning estimates. Real use depends on material quality, site conditions and workmanship. Confirm quantities with your engineer or contractor before ordering. Includes a 10 mm mortar joint. Plaster, lintels, reinforcement and the wastage of mortar are not included.

Frequently asked questions

How many bricks are in 1 sq ft of a 9-inch wall?

Roughly 9 for traditional bricks and 10 to 11 for modular ones, depending on the joints.

How do I calculate bricks for a wall?

Find the wall volume and divide it by the volume of one brick including the mortar joint.

Do I deduct doors and windows?

Yes. Enter their total area in the openings field.

How much wastage should I allow for bricks?

5% is common. Use up to 10% if bricks arrive broken or must be cut.

What mortar ratio is used?

The tool assumes 1:6 cement to sand, which is common for brickwork.