Brick Calculator

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Number of bricks (with joints and wastage), mortar volume, and bricks per m³ and per cft from a wall's length, height and thickness

This tool runs entirely in your browser — no file or data is sent to any server.

Enter the values

What to work out

Wall length

Wall height

Wall thickness

e.g. 250 mm (10″) one-brick wall, 125 mm (5″) half-brick wall

Brick length

Commonly used size 240 × 115 × 70 mm (BDS 208); enter your own

Brick width

Brick height

Mortar joint thickness

Wastage (broken bricks etc.)

Result

Number of bricks (with wastage)

945

Wet mortar volume

0.5112m³

Number of bricks (no wastage): 900.0
Wet mortar volume: 18.053 cft
Brickwork volume: 2.25 m³
Brickwork volume: 79.458 cft
Bricks per m³: 400.0
Bricks per cft: 11.33

This mortar volume is the wet volume; enter it in the mortar & plaster calculator for the cement and sand.

Working

V = 3 × 3 × 0.25 = 2.25 m³
Brick with joint = (240 + 10) × (115 + 10) × (70 + 10) mm = 0.0025 m³
Bricks = 2.25 ÷ 0.0025 = 900; + 5 % = 945
Mortar = 2.25 − 900 × 0.001932 = 0.5112 m³ = 18.05 cft

Formulas

V = L × H × T
Bricks = V ÷ ((l + j)(b + j)(h + j))
With wastage = bricks × (1 + wastage ÷ 100)
Mortar (wet) = V − bricks × l × b × h

l, b, h: brick length, width, height
j: mortar joint thickness
V: volume of brickwork

Assumptions

240 × 115 × 70 mm is a commonly used size (BDS 208); enter your own if your bricks differ.
Each brick carries one joint on each of three faces; deduct openings (doors, windows) first.
The 5 % wastage is only a starting value, not a standard; use your own site's figure.

Sources: BDS 208 (common building clay bricks) · B. N. Dutta, Estimating and Costing in Civil Engineering; S. C. Rangwala, Estimating and Costing · B. C. Punmia, Building Construction

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