Unit Definition (royal foot) The royal foot is a French pied de roi, also called the Paris foot in English.
Unit Definition (pouce) The pouce is a French "inch" unit, equal to 1/12 pied. Based on the pied de roi, the pouce equals about 1.066 inches or 2.707 centimeters. The word pouce means "thumb" in French.
Length/Distance 
