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Brick and block sizes, Imperial and Metric, mortar, concrete, brick quantities and block quantities – how much do you need?

Bricks and Blocks

Metric bricks are a little smaller than the old imperial one. New bricks can be bonded into old brickwork by slightly increasing the mortar bed joint.

There are a variety of sizes available and they differ from country to country. Brick sizes have remained fairly constant over the years although, in the UK, the depth used to be less (about 2 ins/51mm) whereas modern bricks are about 2.5 ins./64mm.

American bricks are about 8 x 4 x 2.25 inches (203 x 102 x 57 mm) South African 8.75 x 4 x 3 inches (222 x 106 x 73mm) and in Australia they are 9 x 4.33 x 3 inches (230 x 110 x 76mm).

 

Comparisons of metric and imperial bricks are as follows:-

 
Length of brick
(excluding joint)

Width of brick
(excluding joint)

Height of brick
(excluding joint)

Typical
Joint

Metric

215mm

102.5mm 50mm10mm

Metric

215mm

102.5mm 65mm 10mm

Imperial

225mm

107.5mm 67/68 mm 10mm

Imperial

230mm

110mm 70mm 10mm

Imperial

230mm

110mm 73mm 10mm

Imperial

230mm

110mm 76mm 10mm

Imperial

230mm

110mm 80mm 10mm