There is a rough arithmetical relationship of length to width of 2:1 and length to height of 3:1 in the standard or Imperial brick

The standard size is 222mm long x 106mm wide x 73mm high.

Other sizes include:

Length

Width

Height

222

90

73

222

40

73

222

90

114

222

140

114

190

90

90

290

90

90