Shoe, Clothing and Ring Size Converter
Convert shoe sizes between U.S., UK and EU (with foot length), women’s clothing sizes, and ring sizes to millimeters.
Size converter
How it works
Shoe sizes come from a widely used athletic-brand chart; brands can differ by half a size, so check foot length when you can.
Ring diameter uses the trade formula: diameter (mm) = 11.63 + 0.8128 × U.S. size.
Questions people ask
What is EU 42 in US shoes?
About a men’s US 8.5 or a women’s US 10.
How do I measure my ring size at home?
Measure the inside diameter of a ring that fits, in millimeters, and enter it in the ring converter.