Ring Size Converter
| Inner Diameter (mm) | US/CA | EU/FR/DE | UK/AU | JP/CN |
|---|---|---|---|---|
| 14.9 | 4 | 47 | H | 8 |
| 15.3 | 4.5 | 48 | I | 9 |
| 15.7 | 5 | 49 | J | 10 |
| 16.1 | 5.5 | 50.5 | K | 11 |
| 16.5 | 6 | 51.9 | L | 12 |
| 16.9 | 6.5 | 53 | M | 13 |
| 17.3 | 7 | 54.4 | N | 14 |
| 17.7 | 7.5 | 55.7 | O | 15 |
| 18.1 | 8 | 57 | P | 16 |
| 18.5 | 8.5 | 58.3 | Q | 17 |
| 18.9 | 9 | 59.5 | R | 18 |
| 19.4 | 9.5 | 60.8 | S | 19 |
| 19.8 | 10 | 62.1 | T | 20 |
| 20.2 | 10.5 | 63.4 | U | 21 |
| 20.6 | 11 | 64.6 | V | 22 |
| 21.0 | 11.5 | 65.9 | W | 23 |
Tip: Measure the inner diameter of an existing ring with a ruler, or wrap a string around your finger, mark where it overlaps, and measure the length — divide by π (3.14159) to get diameter.