The chart below is a ring sizing guide, it includes European, Australian and USA sizes, as well as the standard UK measurements. In between sizes are available in some ranges.
U.S.A. | Circumference | Diameter (mm) | UK/ Australian |
4 1/2 | 48 | 15.27 | I 1/2 |
5 | 49 | 15.70 | J 1/2 |
5 1/2 | 51 | 16.10 | L |
6 | 52 | 16.51 | M |
6 1/2 | 53 | 16.92 | N |
7 | 55 | 17.35 | O |
7 1/2 | 56 | 17.75 | P |
8 | 57 | 18.19 | Q |
8 1/2 | 58 | 18.53 | Q 1/2 |
9 | 59 | 18.89 | R 1/2 |
9 1/2 | 61 | 19.41 | S 1/2 |
10 | 62 | 19.84 | T 1/2 |
10 1/2 | 63 | 20.20 | U 1/2 |
11 | 65 | 20.68 | V 1/2 |
11 1/2 | 66 | 21.08 | W 1/2 |
12 | 68 | 21.49 | Y |
12 1/2 | 69 | 21.89 | Z |
13 | 70 | 22.33 | Z 1/2 |
14 | 76 | 24 | -- |