Our rings are listed in UK sizes. If you know your size in US, Europe or China/HK sizing, use the conversion chart below. If you're between sizes, we recommend choosing the larger size.
| UK | Europe | US | China / HK | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|---|---|---|
| A | – | 0.5 | – | 11.9 | 37.8 |
| B | – | 1 | – | 12.3 | 39.1 |
| C | – | 1.5 | – | 12.7 | 40.4 |
| D | 41.5 | 2 | – | 13.1 | 41.7 |
| E | 42.75 | 2.5 | – | 13.5 | 42.9 |
| F | 44 | 3 | – | 13.9 | 44.2 |
| G | 45.25 | 3⅜ | – | 14.3 | 45.5 |
| H | 46.5 | 3¾ | 8 | 14.7 | 46.8 |
| I | 47.75 | 4¼ | 9 | 15.1 | 48.0 |
| J | 49 | 4⅝ | 10 | 15.5 | 48.7 |
| K | 50 | 5⅛ | 11 | 15.9 | 50.0 |
| L | 51.75 | 5½ | 12 | 16.3 | 51.2 |
| M | 52.75 | 6 | 13 | 16.7 | 52.5 |
| N | 54 | 6½ | – | 17.1 | 53.8 |
| O | 55.25 | 7 | – | 17.5 | 55.1 |
| P | 56.5 | 7½ | 17 | 17.9 | 56.3 |
| Q | 57.75 | 8 | 18 | 18.2 | 57.2 |
| R | 59 | 8⅝ | 19 | 18.6 | 58.9 |
| S | 60.25 | 9⅛ | 20 | 19.1 | 60.2 |
| T | 61.5 | 9⅝ | 21 | 19.5 | 61.4 |
| U | 62.75 | 10¼ | 23 | 20.0 | 62.7 |
| V | 63 | 10⅝ | 24 | 20.3 | 64.0 |
| W | 65 | 11⅛ | 25 | 20.7 | 65.3 |
| X | 66.25 | 11⅝ | 26 | 21.1 | 66.6 |
| Y | 67.5 | 12 | 27 | 21.5 | 67.8 |
| Z | 68.75 | 12½ | 28 | 21.8 | 68.5 |