European shoe size is a standardized system used primarily in Europe to measure footwear. It is based on the length of the foot in centimeters, with sizes typically ranging from 32 to 50 for adults. Each size increment represents a difference of approximately 0.66 centimeters in foot length. The European sizing system is different from other systems, such as the US shoe size or UK shoe size, which can lead to confusion when purchasing shoes internationally. To convert sizes, various online charts and calculators are available, helping consumers find the right fit across different sizing systems.