Our ring size conversion chart includes essential terms like US ring sizes, UK ring sizes, European ring sizes, and international ring size comparison. Providing a comprehensive understanding of how to convert between these different sizing systems is crucial for helping retailers offer the perfect fit for their customers, whether they are selecting engagement rings, wedding bands, or fashion rings.
Ring size chart
| 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 |
| 3 | F | 44 | 14 | 4 | 4 | 14 | 0.551 | 43 | 1.69 |
| 4 | H 1/2 | 46 1/2 | 15 | 7 | 6 1/2 | 14.8 | 0.582 | 46.5 | 1.83 |
| 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 |
