Shoe Size to Length Converter

About this calculator

US men’s shoe sizes increase in fixed steps of 1/3 inch (about 8.46 mm) of foot length per full size, with the scale historically anchored so that size 0 corresponds to a specific base length used by shoe last makers; this is the same relationship a Brannock device — the metal foot-measuring tool found in shoe stores — is built around when it maps a measured heel-to-toe length to a size.

Because online shoe shopping removes the chance to try before buying, converting between a size and a length in millimeters, centimeters or inches lets shoppers measure their actual foot and find the closest matching size across brands, or go the other way to see what foot length a given size assumes — useful for shoe retailers, resellers listing used shoes, and anyone comparing sizing across international scales. Enter a US men’s shoe size or a foot length to convert.