The following length units are commonly used today to define shoe-size systems:
Millimeter (mm)
Centimeter (cm) = 10 mm
Paris point = 2/3 cm = 6.67 mm
Barleycorn = 1/3 inch = 8.47 mm
Traditional shoe sizes by country
Warning: Most of the shoe-size systems listed in this section are not formally standardized. The exact relationship between a labelled shoe size and the interval of foot lengths for which that shoe is suitable can vary substantially between different manufacturers. The following descriptions may only approximate the exact sizing systems used by individual manufacturers. Discrepancies and variations occur in particular if shoes manufactured according to one shoe-size system are labeled in another system. With this lack of standardisation, shoe sizes can even vary from one manufacturer (or brand) as the manufacturer may use multiple different factires around the world to produce a given style.
Continental Europe
In France, Germany, and most other European countries, the traditional shoe size is the length of the last, measured in Paris points. For shoe types where the last is 20 mm longer than the foot for which the shoe will fit:
shoe size = (foot length + 20 mm) / 6.67 mm
Various national and international standards (ISO 9407) recommend a shoe-size system known as Mondopoint. It is based on the mean foot length for which the shoe is suitable, measured in millimeters. A Mondopoint shoe label can optionally also specify the width of the foot, again in millimeters.
European standard EN 13402 recommends instead that shoes should be labeled with the interval of foot lengths for which they are suitable, measured in centimeters.
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