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UK shoe sizes are the basis for the US system but offset by approximately one size — UK 8 corresponds to a US Men's 9 and a foot length of about 27 cm. The UK system is used throughout Britain, Ireland, and many Commonwealth countries, and it closely matches the Indian shoe size system.

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.