To know your size, measure the inner diameter or the inner circumference of a similar ring you have at home, meaning a fascia ring for rings with a large band (like luna and cotton candy rings) or a thin ring for a ring with a thin shank. You could also use a soft meter and measure the circumference of your finger knuckle, that's the widest part of your finger and the ring must go around it, Alternatively, any jewelry store will be able to measure your ring size either with a ring you bring or on your finger directly.
| Italian / Dutch size | US size | Diameter in mm | Circumference in mm |
|---|---|---|---|
| 7 | 4 | 14.8 | 47 |
| 8 | 4 ½ | 15,3 | 48 |
| 9 | 4 ¾ | 15.5 | 49 |
| 10 | 5 ¼ | 15,9 | 50 |
| 11 | 5 ½ | 16.25 | 51 |
| 12 | 6 | 16,5 | 52 |
| 13 | 6 ½ | 16.85 | 53 |
| 14 | 6 ¾ | 17,2 | 54 |
| 15 | 7 ¼ | 17,5 | 55 |
| 16 | 7 ½ | 17,8 | 56 |
| 17 | 8 | 18.2 | 57 |
| 18 | 8 ¼ | 18.5 | 58 |
| 19 | 8 ¾ | 18,8 | 59 |
| 20 | 9 | 19.0 | 60 |
| 21 | 9 ½ | 19,4 | 61 |