Correct column proportions were established & perfected by the Ancient Greeks and Romans.  Brockwell Incorporated offers columns in the five (5) Orders of Classical Architecture:  Tuscan, Doric, Ionic, Corinthian, and Composite − each having the ability to be architecturally (proportionally) correct.  This includes having entasis (bulging effect) on the column shaft for tapered columns.  The column sizes, below, signify the column's bottom diameter x the column's overall height in relation to a 6' tall man.

Column Proportional Chart from Brockwell Incorporated |