Ring Size Converter
Convert ring sizes between US, UK, EU and Japanese systems, or find your size from inner diameter (mm) and circumference.
US
7
UK
N½
EU
54.4
JP
14
| Ø (mm) | Circ (mm) | US | UK | EU | JP |
|---|---|---|---|---|---|
| 14 | 44 | 3 | F | 44 | 4 |
| 14.4 | 45.5 | 3.5 | G | 45.5 | 6 |
| 14.8 | 46.8 | 4 | H | 47 | 7 |
| 15.2 | 48 | 4.5 | I | 48 | 8 |
| 15.6 | 49.3 | 5 | J½ | 49.3 | 9 |
| 16 | 50.6 | 5.5 | K½ | 50.6 | 10 |
| 16.5 | 51.9 | 6 | L½ | 51.9 | 12 |
| 16.9 | 53.1 | 6.5 | M½ | 53.1 | 13 |
| 17.3 | 54.4 | 7 | N½ | 54.4 | 14 |
| 17.7 | 55.7 | 7.5 | O½ | 55.7 | 15 |
| 18.1 | 57 | 8 | P½ | 57 | 16 |
| 18.5 | 58.3 | 8.5 | Q½ | 58.3 | 17 |
| 19 | 59.5 | 9 | R½ | 59.5 | 18 |
| 19.4 | 60.8 | 9.5 | S½ | 60.8 | 19 |
| 19.8 | 62.1 | 10 | T½ | 62.1 | 20 |
| 20.2 | 63.4 | 10.5 | U½ | 63.4 | 22 |
| 20.6 | 64.6 | 11 | V½ | 64.6 | 23 |
| 21 | 65.9 | 11.5 | W½ | 65.9 | 24 |
| 21.4 | 67.2 | 12 | Y | 67.2 | 25 |
| 21.8 | 68.5 | 12.5 | Z | 68.5 | 26 |
| 22.2 | 69.7 | 13 | Z+1 | 69.7 | 27 |
| 22.6 | 71 | 13.5 | Z+2 | 71 | 28 |
Tip: wrap a strip of paper around your finger, mark it, then measure the length in millimetres. That's your circumference. Divide by π (3.14159) to get diameter.