Ring Size Chart
The below chart relates to chart size for rings.
| UK | USA | EUR | Internal Diameter (mm) |
| A | 1/2 | 38 | 12.1 |
| A 1/2 | 3/4 | 12.3 | |
| 39 | 12.4 | ||
| B | 1 | 12.5 | |
| B 1/2 | 1 1/4 | 40 | 12.7 |
| C | 1 1/2 | 12.9 | |
| C 1/2 | 1 3/4 | 41 | 13.1 |
| D | 2 | 13.2 | |
| D 1/2 | 2 1/4 | 42 | 13.4 |
| E | 2 1/2 | 13.6 | |
| 43 | 13.7 | ||
| E 1/2 | 2 3/4 | 13.8 | |
| F | 3 | 14 | |
| F 1/2 | 3 1/8 | 14.5 | |
| 45 | 14.3 | ||
| G | 3 3/8 | 14.4 | |
| G 1/2 | 3 5/8 | 46 | 14.6 |
| H | 3 3/4 | 14.8 | |
| H 1/2 | 4 | 47 | 15 |
| I | 4 1/4 | 15.2 | |
| I 1/2 | 4 1/2 | 15.4 | |
| J | 4 5/8 | 49 | 15.6 |
| J 1/2 | 5 | 15.8 | |
| 50 | 15.9 | ||
| K | 5 1/8 | 16 | |
| K 1/2 | 5 3/8 | 51 | 16.2 |
| L | 5 1/2 | 16.4 | |
| L 1/2 | 5 7/8 | 52 | 16.6 |
| M | 6 | 16.8 | |
| 53 | 16.9 | ||
| M 1/2 | 6 1/4 | 17 | |
| N | 6 1/2 | 54 | 17.2 |
| N 1/2 | 6 3/4 | 17.4 | |
| 55 | 17.5 | ||
| O | 7 | 17.6 | |
| O 1/2 | 7 1/4 | 56 | 17.8 |
| P | 7 1/2 | 18 | |
| 57 | 18.1 | ||
| P 1/2 | 7 3/4 | 18.2 | |
| Q | 8 | 18.4 | |
| 58 | 18.5 | ||
| Q 1/2 | 8 1/4 | 18.6 | |
| R | 8 5/8 | 59 | 18.8 |
| R 1/2 | 8 7/8 | 19 | |
| 60 | 19.1 | ||
| S | 9 1/8 | 19.2 | |
| S 1/2 | 9 3/8 | 61 | 19.4 |
| T | 9 5/8 | 19.5 | |
| T 1/2 | 10 | 62 | 19.7 |
| U | 10 1/4 | 19.9 | |
| U 1/2 | 10 1/2 | 63 | 21.1 |
| V | 10 5/8 | 20.3 | |
| 64 | 20.4 | ||
| V 1/2 | 11 | 20.5 | |
| W | 11 1/8 | 65 | 20.7 |
| W 1/2 | 11 3/8 | 20.9 | |
| 66 | 21 | ||
| X | 11 5/8 | 21.1 | |
| X 1/2 | 11 7/8 | 67 | 21.3 |
| Y | 12 | 21.5 | |
| 68 | 21.6 | ||
| Y 1/2 | 12 1/4 | 21.7 | |
| Z | 12 1/2 | 21.9 | |
| 69 | 22 | ||
| Z 1/2 | 12 3/4 | 22.1 | |
| Z+1 | 22.3 | ||
| Z+2 | 22.7 | ||
| Z+3 | 23.1 |