SIZE GUIDE
SIZE GUIDE
Ring size standards vary between Japanese, American, and European measurements. Actual fit may differ slightly depending on the ring’s width, thickness, and design. As Japanese sizing is used as our standard, slight differences may occur when compared to other country’s sizing.
| Inner Diameter (mm) |
Inner Circumference (mm) |
United States | Europe | Japan |
|---|---|---|---|---|
| 13 | 40.8 | 1 | C | 1 |
| 13 1/3 | 41.9 | 2 | D | 2 |
| 13 2/3 | 42.9 | 2.5 | Ｅ | 3 |
| 14 | 44.0 | 3 | Ｆ | 4 |
| 14 1/3 | 45.0 | 3.5 | Ｇ | 5 |
| 14 2/3 | 46.1 | 3.5 - 4 | Ｇ - Ｈ | 6 |
| 15 | 47.1 | 4 - 4.5 | Ｈ - Ｉ | 7 |
| 15 1/3 | 48.2 | 4.5 - 5 | Ｉ - Ｊ | 8 |
| 15 2/3 | 49.2 | 5 | Ｊ | 9 |
| 16 | 50.3 | 5.5 | Ｋ | 10 |
| 16 1/3 | 51.3 | 6 | Ｌ | 11 |
| 16 2/3 | 52.4 | 6.5 | Ｌ - Ｍ | 12 |
| 17 | 53.4 | 6.5 - 7 | Ｍ - Ｎ | 13 |
| 17 1/3 | 54.5 | 7 - 7.5 | Ｎ - Ｏ | 14 |
| 17 2/3 | 55.5 | 7.5 - 8 | Ｏ - Ｐ | 15 |
| 18 | 56.6 | 8 | Ｐ | 16 |
| 18 1/3 | 57.6 | 8.5 | Ｑ | 17 |
| 18 2/3 | 58.6 | 9 | Ｒ | 18 |
| 19 | 59.7 | 9.5 | Ｓ | 19 |
| 19 1/3 | 60.7 | 10 | Ｔ | 20 |
| 19 2/3 | 61.8 | 10 - 10.5 | Ｔ - Ｕ | 21 |
| 20 | 62.8 | 10.5 | Ｕ | 22 |
| 20 1/3 | 63.9 | 11 | Ｖ | 23 |
| 20 2/3 | 64.9 | 11.5 | Ｗ | 24 |
| 21 | 66.0 | 12 | Ｘ | 25 |
| 21 1/3 | 67.0 | 12.5 | Ｙ | 26 |
| 21 2/3 | 68.0 | 13 | Ｚ | 27 |