Shoe Size Converter — US, EU, UK, Japan

US sizes use a numeric scale starting around size 6 for men and 5 for women, increasing in half-size steps. EU sizes use a single unified scale based on the Paris point (2/3 cm per size), typically running 39–46 for men and 35–42 for women. A men's US 10 is roughly an EU 43. The systems use different starting points and step sizes, so direct math doesn't work — use a conversion table.

Yes, in the US and UK. US men's sizing runs about 1.5 sizes larger than women's in the same shoe — a women's 9 ≈ a men's 7.5. The EU system uses one unified scale for both. Japanese sizes also use one scale (foot length in cm) with no gender split.

Stand on a piece of paper with weight evenly distributed (your foot is largest when bearing weight). Mark the back of your heel and the tip of your longest toe — for most people that's the big toe, but some have a longer second toe. Measure heel-to-toe in millimeters. Convert to cm for JP sizing or look up the equivalent in US/EU/UK tables.

Yes, especially for athletic shoes. US width codes (narrow to wide): AA/B (women's narrow/standard), B/D (men's standard), 2E/4E (men's wide/extra wide). EU sizing typically does not encode width — narrow and wide are sold as separate models or simply unavailable. Many running brands now publish width on the product page.

Manufacturing tolerances, last shape (the foot-shaped form a shoe is built around), and intentional fit choices. Italian brands (Gucci, Prada) tend to run small. American athletic brands (Nike, Adidas) run true to size for athletic, slightly small for casual. Doc Martens famously run a full size large — sizing down is standard. When ordering online for the first time, read recent fit reviews specific to that model.