Ring Size
| AUSTRALIA/UK | ITALY | USA | EUROPEAN (circumference mm) |
| H | 7 | 3 3/4 | 47 |
| H 1/2 | 7.5 | 4 | 47.5 |
| I | 8 | 4 1/4 | 48 |
| I 1/2 | 8.5 | 4 1/2 | 48.5 |
| J | 9 | 4 3/4 | 49 |
| J 1/2 | 9.5 | 5 | 50 |
| K | 10 | 5 1/4 | 50.5 |
| K 1/2 | 11 | 5 1/2 | 51 |
| L | 11.5 | 5 3/4 | 52 |
| L 1/2 | 12 | 6 | 52.5 |
| M | 13 | 6 1/4 | 53 |
| M 1/2 | 13.5 | 6 1/2 | 53.5 |
| N | 14 | 6 3/4 | 54 |
| N 1/2 | 14.5 | 7 | 55 |
| O | 15 | 7 1/4 | 55.5 |
| O 1/2 | 16 | 7 1/2 | 56 |
| P | 16.5 | 7 3/4 | 57 |
| P 1/2 | 17 | 8 | 57.5 |
| Q | 18 | 8 1/4 | 58 |
| Q 1/2 | 18.5 | 8 1/2 | 58.5 |
| R | 19 | 8 3/4 | 59 |
| R 1/2 | 19.5 | 9 | 60 |
| S | 20 | 9 1/4 | 60.5 |
| S 1/2 | 21 | 9 1/2 | 61 |
| T | 21.5 | 9 3/4 | 62 |
| T 1/2 | 22 | 10 | 62.5 |
| U | 23 | 10 1/4 | 63 |
| U 1/2 | 23.5 | 10 1/2 | 64 |
| V | 24 | 10 3/4 | 64.5 |
| V 1/2 | 24.5 | 11 | 65 |
| W | 25.5 | 11 1/4 | 65.5 |
| W 1/2 | 26 | 11 1/2 | 66 |
| X | 26.5 | 11 3/4 | 67 |
| X 1/2 | 27.5 | 12 | 67.5 |
| Y | 28 | 12 1/4 | 68 |
| Y 1/2 | 28.5 | 12 1/2 | 68.5 |
| Z | 29 | 12 3/4 | 69 |
| Z + 1 | 30.5 | 13 1/4 | 70.5 |
| Z + 2 | 31.5 | 13 3/4 | 71.5 |
