Ring Size Chart
| US | UK / AU | EU / Italian | EU / Swiss | Inner Circumference (mm) | Inner Diameter (mm) |
| 3 | F | 4 | 6 | 44.5 | 14.1 |
| 3.5 | G | 5 | 7 | 45.5 | 14.5 |
| 4 | H | 6 | 8 | 46.5 | 14.9 |
| 4.5 | I | 7 | 9 | 47.5 | 15.3 |
| 5 | J | 9 | 10 | 49 | 15.7 |
| 5.5 | K | 10 | 12 | 50 | 16.1 |
| 6 | L | 11 | 13 | 51 | 16.5 |
| 6.5 | M | 12 | 14 | 52.5 | 16.9 |
| 7 | N | 14 | 15 | 54 | 17.3 |
| 7.5 | O | 15 | 17 | 55 | 17.7 |
| 8 | P | 16 | 18 | 56.5 | 18.1 |
| 8.5 | Q | 17 | 19 | 57.5 | 18.5 |
| 9 | R | 18 | 20 | 59 | 18.9 |
| 9.5 | S | 20 | 22 | 60 | 19.3 |
| 10 | T | 21 | 23 | 61.5 | 19.7 |
| 10.5 | U | 22 | 24 | 62.5 | 20.1 |
| 11 | V | 23 | 25 | 63.5 | 20.5 |
| 11.5 | W | 25 | 27 | 65 | 20.9 |
| 12 | X | 26 | 28 | 66 | 21.3 |
| 12.5 | Y | 27 | 29 | 67.5 | 21.7 |
| 13 | Z | 28 | 30 | 68.5 | 22.1 |