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Ring size conversion chart
Convert Japanese 号, US, UK, and EU (ISO) ring sizes. Every row links to a dedicated page with diameter, circumference, and neighboring sizes.
Published July 11, 2026
Full conversion table
| Ø mm | Circ. mm | Japan | US | UK | EU |
|---|---|---|---|---|---|
| 14.1 | 44.2 | 4 | 3 | F | 44 |
| 14.5 | 45.5 | 6 | 3.5 | G | 45 |
| 14.9 | 46.8 | 7 | 4 | H | 47 |
| 15.3 | 48 | 8 | 4.5 | I | 48 |
| 15.7 | 49.3 | 9 | 5 | J½ | 49 |
| 16.1 | 50.6 | 10 | 5.5 | K½ | 51 |
| 16.5 | 51.9 | 12 | 6 | L½ | 52 |
| 16.9 | 53.1 | 13 | 6.5 | M½ | 53 |
| 17.3 | 54.4 | 14 | 7 | N½ | 54 |
| 17.7 | 55.7 | 15 | 7.5 | O½ | 56 |
| 18.1 | 57 | 16 | 8 | P½ | 57 |
| 18.5 | 58.2 | 18 | 8.5 | Q½ | 58 |
| 18.9 | 59.5 | 19 | 9 | R½ | 60 |
| 19.4 | 60.8 | 20 | 9.5 | S½ | 61 |
| 19.8 | 62.1 | 21 | 10 | T½ | 62 |
| 20.2 | 63.3 | 23 | 10.5 | U½ | 63 |
| 20.6 | 64.6 | 24 | 11 | V½ | 65 |
| 21 | 65.9 | 25 | 11.5 | W½ | 66 |
| 21.4 | 67.2 | 26 | 12 | X½ | 67 |
| 21.8 | 68.5 | 27 | 12.5 | Z | 68 |
| 22.2 | 69.7 | 29 | 13 | Z+1 | 70 |
| 22.6 | 71 | 30 | 13.5 | Z+2 | 71 |
| 23 | 72.3 | 31 | 14 | Z+3 | 72 |
| 23.4 | 73.6 | 32 | 14.5 | Z+4 | 74 |
Example: US 7 = US 7 = UK N½ = EU 54 = Japan 14.
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