Japanese Size Conversion

Compare Japanese shoe, clothing and ring sizes with US, UK and EU sizes. Conversions are approximate and vary by brand.

JP shoe size = foot length in cm JIS S 5037 — measure heel to longest toe in cm

Shoe sizes

Japanese shoe sizes are simply the foot length in centimeters (JIS S 5037). Convert that to approximate US, UK and EU sizes.

Japanese Women's Shoe Size Conversion Japanese women's shoe sizes are the foot length in centimeters. Enter your foot length to see the approximate US, UK and EU size. Japanese Men's Shoe Size Conversion Japanese men's shoe sizes are the foot length in centimeters. Enter your foot length to see the approximate US, UK and EU size. Japanese Kids' Shoe Size Conversion Japanese children's shoe sizes are the foot length in centimeters. Enter the foot length to see the approximate US, UK and EU kids' size.

Clothing sizes

How Japan’s 号 (women) and S/M/L (men) sizes line up — roughly — with US, UK and EU. Brands vary a lot.

Japanese Women's Clothing Size Conversion Japanese women's clothes use 号 (gō) numbers, with 9号 as the standard size. Here is roughly how 号 lines up with US, UK and EU — brands vary a lot. Japanese Men's Clothing Size Conversion Japanese men's clothes use S/M/L/LL. Here is roughly how they map to US/UK chest sizes, plus a dress-shirt collar chart. Japanese sizes tend to run smaller.

Rings & accessories

Japan’s 号 (gō) ring sizes, their inner circumference in mm, and the approximate US ring size.

Japanese Ring Size Conversion (号 to US) Japan measures rings in 号 (gō). Each 号 is a fixed inner diameter, so it maps exactly to an inner circumference in mm — and approximately to a US ring size.

Frequently asked questions

How do Japanese shoe sizes work?

A Japanese shoe size is the length of the foot in centimeters (the JIS S 5037 / Mondopoint system). A shoe marked 25 is made for a 25 cm foot. To find your Japanese size, measure your longer foot from heel to longest toe in centimeters — that number is your JP size.

Are the US, UK and EU sizes exact?

No. The centimeter foot length is exact, but US, UK and EU shoe sizes are approximate and differ between brands and lasts. Use them as a starting point and check each brand’s own guide.

How does the Japanese ring size 号 work?

Japanese ring size 号 (gō) is fixed to the ring’s inner diameter: 号1 is 13.0 mm across and each step adds 1/3 mm, so it maps exactly to an inner circumference in mm. The equivalent US size is approximate because the two scales do not line up on whole numbers.