Brick Calculator

How the Brick Calculator works

The brick calculator estimates the number of bricks, cement bags, and sand quantity needed for any wall. Enter wall length, height, and thickness, then select brick size and mortar joint width. The tool adds the wastage percentage you enter (10% by default), so the estimate is a sensible starting point for your order.

Standard Indian brick size

The IS 1077:1992 covers modular and non-modular clay bricks. This tool's presets are Standard India (230×110×75 mm), Modular (190×90×90 mm) and US modular (194×92×57 mm, the actual size of a US "modular" brick), and you can enter a custom size. With the Standard India preset and 10 mm joints, it counts about 98 bricks per square metre for a 230 mm wall and about 49 for a 110 mm wall, before wastage.

Bond patterns

Stretcher bond (bricks laid lengthwise) is typical for 115 mm half-brick partition walls, and English and Flemish bond are used for full-brick 230 mm walls. This calculator counts the wall face in whole bricks and courses, with as many bricks across as the wall thickness allows (one for 110 mm, two for 230 mm, three for 345 mm), and does not model bond patterns, so treat the result as an estimate and add wastage for cuts.

Mortar joint and mix ratios

A standard 10 mm mortar joint is used for most brickwork. The tool gives each brick the mortar of its own bed, head and side joints, which comes to about 23% of the volume of a 230 mm wall of 230×110×75 mm bricks with 10 mm joints, and a wider joint raises it. Mortar mixes from 1:4 to 1:6 (cement:sand) are common; follow your engineer's specification. The calculator always assumes a 1:6 mix, and you cannot choose another ratio. It takes the dry volume as 1.33 times the wet mortar, cement at 1,440 kg/m³ in 50 kg bags and sand as 6 of the 7 parts, which gives about 5.5 bags of cement per cubic metre of wet mortar. These are common estimating assumptions, not a mix design.

Wastage and ordering buffer

The wastage field defaults to 10%; use a higher percentage for walls with many cuts, curves or complex patterns. The calculator adds your chosen percentage to the theoretical brick count and rounds up to a whole brick, which helps avoid mid-project reorders.

Frequently asked questions

How many bricks per square metre?

For a standard Indian brick (230×110×75 mm) with 10 mm mortar joints, this calculator gives about 98 bricks per square metre of 230 mm wall and about 49 per square metre of 110 mm wall, before wastage.

How is brick quantity calculated?

The calculator counts bricks per square metre of wall face as 1 divided by [(brick length + mortar joint) × (brick height + mortar joint)], all in metres, and multiplies by the number of bricks across the wall thickness. For example, with 230×75×110 mm bricks and 10 mm joints: 1 / (0.24 × 0.085) ≈ 49 bricks per m² for a 110 mm wall, and 98 for a 230 mm wall (two bricks across). Multiply by the wall area, minus openings, to get the brick count before adding wastage.

What wastage factor should I use for bricks?

The wastage field defaults to 10%; increase it for walls with many corners, arches or cut bricks, or for decorative bond patterns such as herringbone where more bricks need to be cut. Openings are deducted separately, so do not add wastage for them.