Shoe Size Calculator

Few things frustrate online shoppers more than shoe sizes that refuse to line up from one country to the next. Converting cleanly between US, UK, and European standards for men, women, and children takes the guesswork out of finding a fit that actually works. The calculator works from a measured foot length, which is the most reliable starting point.

The calculator converts your heel-to-toe length to inches and applies the US customary scale, in which one size step is 1/3 inch: men's size = 3 × foot length − 22, and women's sizes run 1.5 larger (3 × foot length − 20.5), rounded to the nearest half size. The UK size is the US size minus 1 for men and minus 2 for women, and the EU size is the US size plus 33 for men or plus 31 for women, rounded to a whole number. These are common chart offsets rather than one international standard; ISO 9407 (Mondopoint) avoids the problem by labeling a shoe with the foot length, and optionally width, in millimeters.

Sizing drifts between brands even within one region, so a brand-specific chart is worth checking whenever one exists. Children's sizes are trickier still because feet grow so fast; measuring directly and comparing against the brand's own chart usually beats relying on conversions alone. And a women's size is not simply a shrunken men's size, since width and last shape often differ in ways the number alone never shows.