Ring Size Chart Comparisons
| US Size | European Size | UK Size | Internal Diameter (mm) | Internal Diameter (cm) |
|---|---|---|---|---|
| 3 | - | F | 14.0 mm | 1.4 cm |
| 3.5 | 46 | G | 14.4 mm | 1.44 cm |
| 4 | 47 | H | 14.8 mm | 1.48 cm |
| 4.5 | 48 | I | 15.2 mm | 1.52 cm |
| 5 | 50 | J | 15.6 mm | 1.56 cm |
| 5.5 | 51 | K | 16.0 mm | 1.60 cm |
| 6 | 52 | L | 16.45 mm | 1.645 cm |
| 6.5 | 53 | M | 16.9 mm | 1.69 cm |
| 7 | 54 | N | 17.3 mm | 1.73 cm |
| 7.5 | 56 | O | 17.7 mm | 1.77 cm |
| 8 | 57 | P | 18.2 mm | 1.82 cm |
| 8.5 | 58 | Q | 18.6 mm | 1.86 cm |
| 9 | 60 | R | 19.0 mm | 1.90 cm |
| 9.5 | 61 | S | 19.4 mm | 1.94 cm |
| 10 | 62 | T | 19.8 mm | 1.98 cm |
| 10.5 | 64 | U | 20.2 mm | 2.02 cm |
| 11 | 65 | V | 20.6 mm | 2.06 cm |
| 11.5 | 66 | W | 21.0 mm | 2.10 cm |
| 12 | 67 | X | 21.4 mm | 2.14 cm |
| 12.5 | 69 | Y | 21.8 mm | 2.18 cm |
| 13 | 70 | Z | 22.2 mm | 2.22 cm |
| 13.5 | 71 | - | 22.6 mm | 2.26 cm |
