| EU | US | UK | Diameter (mm) | China | Japan |
|---|---|---|---|---|---|
| 44 | 3 | F | 14.1 | 4 | 4 |
| 45 | 3.5 | G | 14.5 | 5 | 5 |
| 46 | 4 | H | 14.9 | 6 | 7 |
| 47 | 4.5 | I | 15.3 | 7 | 8 |
| 48 | 5 | J½ | 15.7 | 8 | 9 |
| 49 | 5.5 | K | 16.1 | 9 | 10 |
| 50 | 6 | L½ | 16.5 | 10 | 11 |
| 51 | 6.5 | M | 16.9 | 11 | 12 |
| 52 | 7 | N | 17.3 | 12 | 13 |
| 53 | 7.5 | O | 17.7 | 13 | 14 |
| 54 | 8 | P | 18.1 | 14 | 15 |
| 55 | 8.5 | Q | 18.5 | 15 | 16 |
| 56 | 9 | R | 18.9 | 16 | 17 |
| 57 | 9.5 | S | 19.3 | 17 | 18 |
| 58 | 10 | T | 19.7 | 18 | 19 |
| 59 | 10.5 | U | 20.1 | 19 | 20 |
| 60 | 11 | V | 20.5 | 20 | 21 |
| 61 | 11.5 | W | 20.9 | 21 | 22 |
| 62 | 12 | X | 21.3 | 22 | 23 |
Not sure of your size? Measure the inner diameter of a ring you already own that fits well, and match it to the "Diameter (mm)" column above.
Let me know if you want this reformatted as a shorter, simplified table (fewer sizes) instead of the full range.