Shoe Size Converter: US, UK, EU, Japan + Charts

To calculate UK size men’s shoes, you subtract .5 from the US size. (Note – some guides say to subtract 1. This is also technically correct, because it depends on the brand.) To convert US to Japan men’s, you can add 18. For example, a US 10 is a 9.5 UK size. Or, converting to EU size would be 42.5. And lastly a size 10 would be a 28 in Japan size.

Source: convertshoesize.com