Use the table on this page to convert your local standard to the US ring sizes for ordering on our website.
| US | British | French | German | Japanese | Swiss | Diameter (mm) | Diameter (in) | Circum (mm) | Circum (in) |
|---|---|---|---|---|---|---|---|---|---|
| 2 | D | 41 1/2 | 13 1/2 | 2 | 1 1/2 | 13.3 | 0.524 | 41.7 | 1.64 |
| 2 1/2 | E | 42 3/4 | 13 3/4 | 3 | 2 3/4 | 13.7 | 0.539 | 42.8 | 1.68 |
| 3 | F | 44 | 14 | 4 | 4 | 14 | 0.551 | 43 | 1.69 |
| 3 1/2 | G | 45 1/4 | 14 1/2 | 5 1/2 | 6 1/3 | 14.4 | 0.567 | 45.2 | 1.78 |
| 4 | H 1/2 | 46 1/2 | 15 | 7 | 6 1/2 | 14.8 | 0.582 | 46.5 | 1.83 |
| 4 1/2 | I 1/2 | 47 3/4 | 15 1/4 | 8 | 8 | 15.2 | 0.598 | 47.7 | 1.88 |
| 5 | J 1/2 | 49 | 15 3/4 | 9 | 9 1/2 | 15.7 | 0.618 | 49.3 | 1.94 |
| 6 | M | 51 1/2 | 16 1/2 | 12 | 12 3/4 | 16.5 | 0.650 | 51.9 | 2.04 |
| 7 | O | 54 | 17 1/4 | 14 | 15 1/4 | 17.4 | 0.683 | 54.5 | 2.15 |
| 8 | Q | 56 3/4 | 18 | 16 | 17 3/4 | 18.2 | 0.716 | 57.2 | 2.25 |
| 9 | R 1/2 | 59 1/4 | 19 | 18 | 20 | 18.9 | 0.748 | 59.3 | 2.35 |
| 10 | T 1/2 | 61 3/4 | 20 | 20 | 21 3/4 | 19.8 | 0.781 | 62.3 | 2.45 |
| 11 | V 1/2 | 64 1/4 | 20 3/4 | 23 | 24 | 20.7 | 0.814 | 65.09 | 2.56 |
| 12 | Y | 67 1/4 | 21 1/4 | 25 | 27 1/2 | 21.5 | 0.846 | 67.5 | 2.66 |
| 13 | Z +1 | 69 | 22 | 27 | 29 1/4 | 22.3 | 0.879 | 70.2 | 2.76 |
| 14 | Z + 2 | 72.5 | 23.2 | NA | 32.3 | 23.2 | 0.91 | 72.9 | 2.87 |
NOTE: Ring sizes are not 100% exact, there can be slight variations.