Ring Size Chart
| US/CA | UK/AU | FR/DE | IT/ES | Inside Diameter（mm） | Inside Circumference （mm） | Inside Diameter（inches） | Inside Circumference （inches） |
| 3 | F | 44 | 4.25 | 14.1 | 44.2 | 0.6 | 1.7 |
| 3.5 | G | 45.5 | 5.5 | 14.5 | 45.5 | 0.6 | 1.8 |
| 4 | H | 47 | 6.75 | 14.9 | 46.8 | 0.6 | 1.8 |
| 4.5 | I | 48 | 8 | 15.3 | 48 | 0.6 | 1.9 |
| 5 | J-½ | 50 | 9.25 | 15.7 | 49.3 | 0.6 | 1.9 |
| 5.5 | K-½ | 51 | 10.5 | 16.1 | 50.6 | 0.6 | 2 |
| 6 | L-½ | 52 | 11.75 | 16.5 | 51.9 | 0.6 | 2 |
| 6.5 | M-½ | 53 | 13.25 | 16.9 | 53.1 | 0.7 | 2.1 |
| 7 | N-½ | 54 | 14.5 | 17.3 | 54.4 | 0.7 | 2.1 |
| 7.5 | O-½ | 56 | 15.75 | 17.7 | 55.7 | 0.7 | 2.2 |
| 8 | P-½ | 57 | 17 | 18.1 | 57 | 0.7 | 2.2 |
| 8.5 | Q-½ | 58 | 18.25 | 18.5 | 58.3 | 0.7 | 2.3 |
| 9 | R-½ | 60 | 19.5 | 19 | 59.5 | 0.7 | 2.3 |
| 9.5 | S-½ | 61 | 20.75 | 19.4 | 60.8 | 0.8 | 2.4 |
| 10 | T-½ | 62 | 22 | 19.8 | 62.1 | 0.8 | 2.4 |
| 10.5 | U-½ | 63 | 23.25 | 20.2 | 63.4 | 0.8 | 2.5 |
| 11 | V-½ | 64 | 24.75 | 20.6 | 64.6 | 0.8 | 2.5 |
| 11.5 | W-½ | 66 | 26 | 21 | 65.9 | 0.8 | 2.6 |
| 12 | X-½ | 67 | 27.25 | 21.4 | 67.2 | 0.8 | 2.6 |
| 12.5 | Z | 68 | 28.5 | 21.8 | 68.5 | 0.9 | 2.7 |
| 13 | Z+1 | 70 | 29.75 | 22.2 | 69.7 | 0.9 | 2.7 |
| 13.5 | Z+1.5 | 71 | 31 | 22.6 | 71 | 0.9 | 2.8 |
| 14 | Z+2 | 72 | 32.5 | 23 | 72.3 | 0.9 | 2.8 |
| 14.5 | Z+2.5 | 73.5 | 33.5 | 23.4 | 73.5 | 0.9 | 2.9 |
| 15 | Z+3 | 75 | 34.75 | 23.8 | 74.8 | 0.9 | 2.9 |