The cube root law is an observation in political science that the number of members of a unicameral legislature, or of the lower house of a bicameral legislature, is about the cube root of the population being represented.
[1] The rule was devised by Estonian political scientist Rein Taagepera in his 1972 paper "The size of national assemblies".
[4] Giorgio Margaritondo argued that the experimental data, including the dataset originally used by Taagepera in 1972, actually fits better to a function with a higher exponent, and that there is sufficient deviation from the cube root rule to question its usefulness.
Some of these countries (e.g. Germany) have overhang seats in a mixed member proportional system, as a result the size of their parliaments can vary significantly between elections.
The following table describes how the US House of Representatives would have looked historically under the cube root rule according to the Huntington–Hill method.