Adult Ring Sizes
Adult Ring Sizes
| Inside Diameter mm | Inside Circumference mm | UK | US | EU |
| 14.1 | 44.2 | F1/2 | 3 | 44 |
| 14.5 | 45.5 | G1/2 | 3.5 | 45 |
| 14.88 | 46.8 | H1/2 | 4 | 46.5 |
| 15.92 | 48 | I1/2 | 4.5 | 47 |
| 15.7 | 49.3 | J1/2 | 5 | 48.5 |
| 16.1 | 50.6 | K1/2 | 5.5 | 50 |
| 16.51 | 51.9 | L1/2 | 6 | 51 |
| 16.92 | 53.1 | M1/2 | 6.5 | 52 |
| 17.32 | 54.4 | N1/2 | 7 | 55 |
| 17.73 | 55.7 | O1/2 | 7.5 | 56 |
| 18.14 | 57 | P1/2 | 8 | 57 |
| 18.54 | 58.3 | Q1/2 | 8.5 | 58.5 |
| 18.95 | 59.5 | R1/2 | 9 | 59 |
| 19.4 | 60.8 | S1/2 | 9.5 | 60.5 |
| 19.76 | 62.1 | T1/2 | 10 | 61.5 |
| 20.17 | 63.4 | U1/2 | 10.5 | 62 |
| 20.57 | 64.6 | V1/2 | 11 | 64 |
| 20.98 | 65.9 | W1/2 | 11.5 | 66 |
| 21.39 | 67.2 | X1/2 | 12 | 68 |
