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Ring Size Conversion Chart
Choose a sizing system and your size to see the equivalent size in every other system. Sizes vary between brands, so use this chart as a guide and check the brand’s own size chart when possible.
- US
- 7
- UK
- N½
- EU
- 54
- Japan
- 14
- Inner diameter (mm)
- 17.32
- Inner circumference (mm)
- 54.4
Size chart
| US | UK | EU | Japan | Inner diameter (mm) | Inner circumference (mm) |
|---|---|---|---|---|---|
| 3 | F | 44 | 4 | 14.07 | 44.2 |
| 3.5 | G | 45 | 5 | 14.47 | 45.5 |
| 4 | H | 47 | 7 | 14.88 | 46.8 |
| 4.5 | I | 48 | 8 | 15.29 | 48 |
| 5 | J½ | 49 | 9 | 15.69 | 49.3 |
| 5.5 | K | 51 | 10 | 16.1 | 50.6 |
| 6 | L½ | 52 | 12 | 16.51 | 51.9 |
| 6.5 | M | 53 | 13 | 16.91 | 53.1 |
| 7 | N½ | 54 | 14 | 17.32 | 54.4 |
| 7.5 | O | 56 | 15 | 17.73 | 55.7 |
| 8 | P½ | 57 | 16 | 18.13 | 57 |
| 8.5 | Q | 58 | 17 | 18.54 | 58.2 |
| 9 | R½ | 60 | 18 | 18.95 | 59.5 |
| 9.5 | S | 61 | 19 | 19.35 | 60.8 |
| 10 | T½ | 62 | 20 | 19.76 | 62.1 |
| 10.5 | U | 63 | 22 | 20.16 | 63.3 |
| 11 | V½ | 65 | 23 | 20.57 | 64.6 |
| 11.5 | W | 66 | 24 | 20.98 | 65.9 |
| 12 | X½ | 67 | 25 | 21.38 | 67.2 |
| 12.5 | Y | 68 | 26 | 21.79 | 68.5 |
| 13 | Z | 70 | 27 | 22.2 | 69.7 |