Aidosss studio rings size chart
| US Size | Diameter (mm) | Circumference (mm) |
| 3 | 44.2 | 14.07 |
| 3.5 | 45.5 | 14.48 |
| 4 | 46.8 | 14.88 |
| 4.5 | 48 | 15.29 |
| 5 | 49.3 | 15.7 |
| 5.5 | 50.6 | 16.1 |
| 6 | 51.9 | 16.51 |
| 6.5 | 53.1 | 16.92 |
| 7 | 54.4 | 17.32 |
| 7.5 | 55.7 | 17.73 |
| 8 | 57 | 18.14 |
| 8.5 | 58.3 | 18.54 |
| 9 | 59.5 | 18.95 |
| 9.5 | 60.8 | 19.35 |
| 10 | 62.1 | 19.76 |
| 10.5 | 63.4 | 20.17 |
| 11 | 64.6 | 20.57 |
| 11.5 | 65.9 | 20.98 |
| 12 | 67.2 | 21.39 |