Ring Size Conversion Chart
| SKD RING SIZE | Inside Diameter in millimeters | American Size |
| 45.24 | 14.40 | 3 1/2 |
| 45.5 | 14.48 | |
| 45.75 | 14.56 | 3 3/4 |
| 46 | 14.64 | |
| 46.5 | 14.80 | 4 |
| 47 | 14.96 | 4 1/4 |
| 47.5 | 15.10 | |
| 47.73 | 15.20 | 4 1/2 |
| 48 | 15.30 | |
| 48.5 | 15.44 | 4 3/4 |
| 49 | 15.60 | 5 |
| 49.5 | 15.76 | 5 1/4 |
| 50 | 15.90 | |
| 50.24 | 16.00 | 5 1/2 |
| 50.5 | 16.10 | |
| 51 | 16.23 | 5 3/4 |
| 51.5 | 16.39 | 6 |
| 52 | 16.55 | 6 1/4 |
| 52.5 | 16.70 | |
| 52.75 | 16.80 | 6 1/2 |
| 53 | 16.90 | |
| 53.5 | 17.03 | 6 3/4 |
| 54 | 17.19 | 7 |
| 54.5 | 17.30 | |
| 54.64 | 17.40 | 7 1/4 |
| 55 | 17.50 | |
| 55.26 | 17.60 | 7 1/2 |
| 55.5 | 17.70 | |
| 56 | 17.83 | 7 3/4 |
| 56.5 | 17.99 | 8 |
| 57 | 18.10 | |
| 57.15 | 18.20 | 8 1/4 |
| 57.5 | 18.30 | |
| 57.78 | 18.40 | 8 1/2 |
| 58 | 18.50 | |
| 58.5 | 18.62 | 8 3/4 |
| 59 | 18.78 | 9 |
| 59.5 | 18.90 | |
| 59.66 | 19.00 | 9 1/4 |
| 60 | 19.10 | |
| 60.29 | 19.20 | 9 1/2 |
| 60.5 | 19.30 | |
| 61 | 19.42 | 9 3/4 |
| 61.5 | 19.58 | 10 |
| 62 | 19.70 | |
| 62.17 | 19.80 | 10 1/4 |
| 62.8 | 20.00 | 10 1/2 |
| 63 | 20.05 | |
| 63.43 | 20.20 | 10 3/4 |
| 64 | 20.37 | 11 |
| 64.68 | 20.60 | 11 1/4 |
| 65 | 20.70 | |
| 65.3 | 20.80 | 11 1/2 |
| 66 | 21.01 | 11 3/4 |
| 66.57 | 21.20 | 12 |
| 67.2 | 21.40 | 12 1/4 |
| 67.82 | 21.60 | 12 1/2 |
| 68.45 | 21.80 | 12 3/4 |
| 69.1 | 22.00 | 13 |