| Ring Size | Diameter (mm) | Diameter (inches) |
|---|---|---|
| 10 | 19.8 | 0.78 |
| 11 | 20.8 | 0.82 |
| 12 | 21.8 | 0.86 |
| 13 | 22.8 | 0.90 |
| 14 | 23.8 | 0.94 |
| 15 | 24.8 | 0.98 |
| 16 | 25.8 | 1.02 |
| 17 | 26.8 | 1.06 |
| 18 | 27.8 | 1.09 |
| 19 | 28.8 | 1.13 |
| 20 | 29.8 | 1.17 |
| 21 | 30.8 | 1.21 |
| 22 | 31.8 | 1.25 |
| 23 | 32.8 | 1.29 |
| 24 | 33.8 | 1.33 |
| 25 | 34.8 | 1.37 |
| 26 | 35.8 | 1.41 |
| 27 | 36.8 | 1.45 |
| 28 | 37.8 | 1.49 |
| 29 | 38.8 | 1.53 |
| 30 | 39.8 | 1.57 |
| 31 | 40.8 | 1.61 |
| 32 | 41.8 | 1.65 |
| 33 | 42.8 | 1.69 |