An apparatus for measuring the dimensions of human feet is comprised of a base and a cover, which fits over it to define the borders of two essentially rectangular wells into which the feet to be measured are placed. A pressure pad assembly comprising a matrix of sensors is placed at the bottom of base. The walls of the wells are defined by PCBS comprising arrays comprised of a multitude of emitter/detector pairs, which are used to make length and width measurements of said feet. MCUs on the pressure pad assembly and computation means comprise software algorithms that automatically make length, width, and pressure measurements and correct errors in the length and width measurements caused by misalignment of the feet in the wells. Methods of using the apparatus are also presented.