Ring Size Chart
| US/CA Size | UK/AU/NZ Size | EU Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 4 | H | 47 | 14.9 | 46.8 |
| 4.5 | I-1/2 | 48 | 15.3 | 48.0 |
| 5 | J-1/2 | 49 | 15.7 | 49.3 |
| 5.5 | L | 51 | 16.1 | 50.6 |
| 6 | M | 52 | 16.5 | 51.9 |
| 6.5 | N | 53 | 16.9 | 53.1 |
| 7 | O | 55 | 17.3 | 54.4 |
| 7.5 | P | 56 | 17.7 | 55.7 |
| 8 | Q | 57 | 18.1 | 56.9 |
| 8.5 | Q-1/2 | 58 | 18.5 | 58.3 |
| 9 | R-1/2 | 59 | 18.9 | 59.5 |
| 9.5 | S-1/2 | 61 | 19.3 | 60.8 |
| 10 | T-1/2 | 62 | 19.7 | 62.1 |
| 10.5 | U-1/2 | 63 | 20.2 | 63.4 |
| 11 | V-1/2 | 64 | 20.4 | 64.7 |
| 11.5 | W-1/2 | 66 | 21.0 | 66.0 |
| 12 | Y | 67 | 21.4 | 67.3 |