Women's Rings - Size Guide
| US Size | Italian Size | UK Size | Japanese Size | Inner Diameter (mm) | Inner Diameter (in) |
|---|---|---|---|---|---|
| 2 | 2 | D | 2 | 1.33 | 4.18 |
| 2.5 | 2.5 | E | 2.5 | 1.35 | 4.25 |
| 3 | 4 | F | 4 | 1.40 | 4.40 |
| 3.5 | 5.5 | G | 5.5 | 1.45 | 4.55 |
| 4 | 6.8 | H 1/2 | 6.5 | 1.47 | 4.62 |
| 4.5 | 8 | I 1/2 | 8 | 1.53 | 4.80 |
| 5 | 9.5 | J 1/2 | 9.5 | 1.58 | 4.96 |
| 5.5 | 10.5 | L | 10.5 | 1.61 | 5.06 |
| 6 | 11.5 | M | 11 | 1.63 | 5.12 |
| 6.5 | 13 | N | 12.5 | 1.68 | 5.25 |
| 7 | 14.5 | O | 14 | 1.73 | 5.30 |
| 7.5 | 16 | P | 15.5 | 1.78 | 5.59 |
| 8 | 17 | Q | 16.5 | 1.81 | 5.68 |
| 8.5 | 18.5 | Q 1/2 | 18 | 1.86 | 5.84 |
| 9 | 19.5 | R 1/2 | 19 | 1.90 | 5.97 |
| 9.5 | 21 | S 1/2 | 20.5 | 1.95 | 6.12 |
| 10 | 22 | T 1/2 | 21.5 | 1.98 | 6.22 |
| 10.5 | 23.5 | U 1/2 | 22.5 | 2.02 | 6.34 |
| 11 | 25 | W | 24 | 2.06 | 6.47 |
| 11.5 | 26.5 | W 1/2 | 25.5 | 2.11 | 6.63 |
| 12 | 27.5 | Y | 26 | 2.13 | 6.68 |
| 12.5 | 28.5 | Z | 27 | 2.17 | 6.81 |
| 13 | 30 | 1 | 29 | 2.22 | 6.97 |
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