Ring Size Guide
| USA/Canada | UK/Australia | Diameter (mm) | Circumference (mm) Europe/ISO |
| 4 | H | 14.9 | 46.8 |
| 4.5 | I | 15.3 | 48 |
| 5 | J-1/2 | 15.7 | 49.3 |
| 5.5 | K-1/2 | 16.1 | 50.6 |
| 6 | L-1/2 | 16.5 | 51.9 |
| 6.5 | M-1/2 | 16.9 | 53.1 |
| 7 | N-1/2 | 17.3 | 54.4 |
| 7.5 | O-1/2 | 17.7 | 55.7 |
| 8 | P-1/2 | 18.1 | 57 |
| 8.5 | Q-1/2 | 18.5 | 58.3 |
| 9 | R-1/2 | 19 | 59.5 |
| 9.5 | S-1/2 | 19.4 | 60.8 |
| 10 | T-1/2 | 19.8 | 62.1 |
| 10.5 | U-1/2 | 20.2 | 63.4 |
| 11 | V-1/2 | 20.6 | 64.6 |
| 11.5 | W-1/2 | 21 | 65.9 |