| Ring Size | Measured Size | |
| USA | inches | mm |
| 4 | 1 13/16 | 46.5 |
| 4 1/2 | 1 7/8 | 47.8 |
| 5 | 1 15/16 | 49 |
| 5 1/2 | 2 | 50.3 |
| 6 | 2 1/16 | 51.5 |
| 6 1/2 | 2 1/8 | 52.8 |
| 7 | 2 3/16 | 54 |
| 7 1/2 | 2 1/4 | 55.3 |
| 8 | 2 5/16 | 56.6 |
| 8 1/2 | 2 3/8 | 57.8 |
| 9 | 2 7/16 | 59.1 |
| 9 1/2 | 2 1/2 | 60.3 |
| 10 | 2 9/16 | 61.6 |
| 10 1/2 | 2 5/8 | 62.8 |
| 11 | 2 11/16 | 64.1 |
| 11 1/2 | 2 3/4 | 65.3 |
| 12 | 2 13/16 | 66.6 |
| 12 1/2 | 2 7/8 | 67.9 |
| 13 | 2 15/16 | 69.1 |