Ring Size Guide for UK, Italy, US, Canada, Australia up to Size 10
| Region | UK Size | Italy Size | US Size | Canada Size | Australia Size | Circumference (mm) | Diameter (mm) |
|---|---|---|---|---|---|---|---|
| Size 3 | E (44.2) | 7.75 (55.1) | 2.25 (19.62) | 2 (18.99) | 5 (13.19) | 44.2 | 14.05 |
| Size 4 | F (45.5) | 8 (56.9) | 2.5 (20.24) | 3 (19.81) | 6 (13.41) | 45.5 | 14.86 |
| Size 5 | G (46.8) | 9 (57.6) | 2.75 (20.86) | 4 (20.68) | 7 (13.63) | 46.8 | 15.7 |
| Size 6 | H (48) | 10 (58.2) | 3 (21.49) | 5 (21.08) | 8 (13.86) | 48 | 16.51 |
| Size 7 | I (49.3) | 11 (59.5) | 3.25 (22.12) | 6 (21.49) | 9 (14.09) | 49.3 | 17.35 |
| Size 8 | J (50.6) | 12 (60.8) | 3.5 (22.75) | 7 (21.89) | 10 (14.32) | 50.6 | 18.19 |
| Size 9 | K (51.9) | 13 (61.4) | 3.75 (23.37) | 8 (22.29) | 11 (14.55) | 51.9 | 19.02 |
| Size 10 | L (53.1) | 14 (62.7) | 4 (24) | 9 (22.69) | 12 (14.78) | 53.1 | 19.86 |