Abstract: A shoe sizer capable of measuring the feet of men or women and designed to be readily shipped by mail, comprising a base having a flat upper surface, an elongate slot, and a plurality of mounting recesses; a vertically-projecting heel portion having a mounting lug for engaging one of the mounting recesses and designed to accurately and consistently position a heel on a selected portion of said base; a vertically projecting stopping member to aid in the proper positioning of the foot; a foot width indicator which is slidably engaged in the elongate slot; and a sizing grid placed on the upper surface of the base so as to accurately and consistently measure the size and width of either men's or women's feet.