Why Shoe Sizes Differ Between Countries

Length scales differ

US and UK scales use roughly one-third-inch increments; European sizing uses the two-thirds-centimeter Paris point. These increments do not align exactly, and starting points and category conventions differ.

Metric labeling also needs context

Mondopoint uses foot measurements, but a printed CM/JP label is not proof that a manufacturer’s retail label equals measured foot length. Nike explicitly separates those values.

Fractional EU sizes are real

Manufacturers can use fractional EU labels. adidas commonly uses one-third and two-third sizes, not the half-size list sometimes copied into generic charts. Read the label as published.

Choose a chart, then verify fit

Use one product-specific chart and keep category and market consistent. A label conversion cannot determine width, instep volume or comfortable toe space.