Asia (Japan, Korea, HK, SE Asia)
Japan, China, Hong Kong, Singapore, Malaysia, Thailand, Vietnam, and the Philippines generally share a numerical sizing system based loosely on diameter. A US 7 typically translates to a Japanese Size 14.
Master Conversion Hub
International Ring Size Conversion Chart
Convert your ring size across 25+ countries instantly. Our master matrix covers the US, UK, EU, Asia (Japan, China, Hong Kong), and the Middle East, all anchored to standard ISO 8653 millimeters.
The ISO 8653 Standard
International ring sizing can be chaotic, but it is all anchored by ISO 8653, the international standard which dictates that a ring's size should be based on its inner circumference in millimeters. The EU directly uses this standard (e.g., EU size 54 means 54mm circumference).
| Circumference (mm) | US / Canada | UK / Australia / NZ / South Africa | EU / France / Russia | Japan / China / SE Asia | India |
|---|---|---|---|---|---|
| 47.1 | 4 | H 1/2 | 47 | 7 | 7 |
| 49.3 | 5 | J 1/2 | 49 | 9 | 9 |
| 51.9 | 6 | L 1/2 | 52 | 12 | 12 |
| 54.4 | 7 | N 1/2 | 54 | 14 | 14 |
| 57.0 | 8 | P 1/2 | 57 | 16 | 17 |
| 59.5 | 9 | R 1/2 | 59 | 18 | 20 |
| 62.1 | 10 | T 1/2 | 62 | 21 | 23 |
| 64.6 | 11 | V 1/2 | 65 | 23 | 26 |
| 67.2 | 12 | X 1/2 | 67 | 25 | 29 |
UK & Commonwealth
The UK, Australia, New Zealand, Ireland, and South Africa use an alphabetical sizing system (A to Z+). A US size 7 is approximately an N 1/2.
Middle East & Africa
Dubai, UAE, Qatar, Egypt, and Kenya heavily rely on the European (ISO) circumference system. A ring measuring 52mm in circumference is simply a Size 52.
Written by Evelyn Moore
Evelyn is a certified GIA Gemologist with over a decade of experience in fine jewelry sizing and design. She ensures all conversion charts and measuring advice strictly adhere to ISO 8653 standards.