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US Men's shoe sizes follow a scale where size 9 corresponds to a foot length of approximately 27 cm, with each half-size adding about 0.42 cm. The US system is used throughout North America and differs from UK sizes by approximately one full size (US 9 ≈ UK 8). Athletic shoe sizes may vary slightly between brands.

Japanese shoe sizes (also used in Korea) directly represent foot length in millimeters — JP 260 means a 26 cm foot, JP 270 means 27 cm. This makes the Japanese system the simplest and most intuitive, as the size number directly equals the foot measurement. Japanese sizes range typically from 230 (women's) to 290 (men's large).