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International Ring Size Conversion Table
| U.S. &
Canada |
Great
Britain |
France |
Germany |
Japan |
Switzerland |
| 3-1/2 | - | - | 14-1/2 | - | - |
| 3-3/4 | H | 46-1/2 | - | 6-1/2 | 6-1/2 |
| 4 | H-1/2 | - | 15 | 7 | - |
| 4-1/4 | I | 47-3/4 | - | - | 7-3/4 |
| 4-1/2 | I-1/2 | - | 15-1/4 | 8 | - |
| 4-3/4 | J | 49 | - | - | 9 |
| 5 | J-1/2 | - | 15-3/4 | 9 | - |
| 5-1/4 | K | 50 | - | - | 10 |
| 5-1/2 | L | 51-3/4 | 16 | - | 11-3/4 |
| 5-3/4 | L-1/2 | - | - | 11 | - |
| 6 | M | 52-3/4 | 16-1/2 | 12 | 12-3/4 |
| 6-1/2 | N | 54 | 17 | 13 | 14 |
| 7 | O | 55-1/4 | 17-1/4 | 14 | 15-1/4 |
| 7-1/2 | P | 56-1/2 | 17-3/4 | 15 | 16-1/2 |
| 8 | Q | 57-3/4 | 18 | 16 | 17-3/4 |
| 8-1/2 | - | - | 18-1/2 | 17 | - |
| 8-3/4 | R | 59 | - | - | 19 |
| 9 | - | - | 19 | 18 | - |
| 9-1/4 | S | 60-1/4 | - | - | 20-1/4 |
| 9-1/2 | - | - | 19-1/2 | 19 | - |
| 9-3/4 | T | 61-1/2 | - | - | 21-1/2 |
| 10 | T-1/2 | - | 20 | 20 | ... |
| 10-1/4 | U | 62-3/4 | - | 21 | 22-3/4 |
| 10-1/2 | U-1/2 | - | 20-1/4 | 22 | - |
| 10-3/4 | V | 63-3/4 | - | - | 23-3/4 |
| 11 | V-1/2 | - | 20-3/4 | 23 | - |
| 11-1/4 | W | 65 | - | - | 25 |
| 11-1/2 | - | - | 21 | 24 | - |
| 11-3/4 | X | 66-1/4 | - | - | 26-1/4 |
| 12 | Y | 67-1/2 | 21-1/4 | 25 | 27-1/2 |
| 12-1/2 | Z | 68-3/4 | 21-3/4 | 26 | 28-3/4 |
| 13 | - | - | 22 | 27 | - |
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