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Ring-Size Conversion Table |
| US/Canada | Avg. Diam Inches |
British |
French | German | Japanese | Swiss |
| 000 | .390 | ... | ... | ... | ... | ... |
| 00 | .422 | ... | ... | ... | ... | ... |
| 0 | .454 | ... | ... | ... | ... | ... |
| 1/2 | ... | A | ... | ... | ... | ... |
| 3/4 | ... | A-1/2 | ... | ... | ... | ... |
| 1 | .487 | B | ... | ... | 1 | ... |
| 1 1/4 | ... | B-1/2 | ... | ... | ... | ... |
| 1 1/2 | .503 | C | ... | ... | ... | ... |
| 1 3/4 | ... | C-1/2 | ... | ... | ... | ... |
| 2 | .520 | D | 41 1/2 | 13 1/4 | 2 | 1 1/2 |
| 2 1/4 | ... | D-1/2 | ... | ... | ... | ... |
| 2 1/2 | .536 | E | 42 3/4 | 13 3/4 | 3 | 2 3/4 |
| 2 3/4 | ... | E-1/2 | ... | ... | ... | ... |
| 3 | .553 | F | 44 | 14 | 4 | 4 |
| 3 1/8 | ... | F-1/2 | ... | ... | ... | ... |
| 3 3/8 | ... | G | 45 1/4 | ... | 5 | 5 1/4 |
| 3 1/2 | .569 | ... | ... | 14 1/2 | ... | ... |
| 3 5/8 | ... | G-1/2 | ... | ... | 6 | ... |
| 3 3/4 | ... | H | 46 1/2 | ... | ... | 6 1/2 |
| 4 | .585 | H-1/2 | ... | 15 | 7 | ... |
| 4 1/4 | ... | I | 47 3/4 | ... | ... | 7 3/4 |
| 4 1/2 | .601 | I-1/2 | ... | 15 1/4 | 8 | ... |
| 4 7/8 | ... | J | 49 | ... | ... | 9 |
| 5 | .618 | J-1/2 | ... | 15 3/4 | 9 | ... |
| 5 1/8 | ... | K | 50 | ... | ... | 10 |
| 5 3/8 | ... | K-1/2 | ... | ... | 10 | ... |
| 5 1/2 | .634 | L | 51 3/4 | 16 | ... | 11 3/4 |
| 5 7/8 | ... | L-1/2 | ... | ... | 11 | ... |
| 6 | .650 | M | 52 3/4 | 16 1/2 | 12 | 12 3/4 |
| 6 1/4 | ... | M-1/2 | ... | ... | ... | ... |
| 6 1/2 | .666 | N | 54 | 17 | 13 | 14 |
| 6 3/4 | ... | N-1/2 | ... | ... | ... | ... |
| 7 | .683 | O | 55 1/4 | 17 1/4 | 14 | 15 1/4 |
| 7 1/4 | ... | O-1/2 | ... | ... | ... | ... |
| 7 1/2 | .699 | P | 56 1/2 | 17 3/4 | 15 | 16 1/2 |
| 7 3/4 | ... | P-1/2 | ... | ... | ... | ... |
| 8 | .716 | Q | 57 3/4 | 18 | 16 | 17 3/4 |
| 8 1/4 | ... | Q-1/2 | ... | ... | ... | ... |
| 8 1/2 | .732 | ... | ... | 18 1/2 | 17 | ... |
| 8 5/8 | ... | R | 59 | ... | ... | 19 |
| 8 7/8 | ... | R-1/2 | ... | ... | ... | ... |
| 9 | .748 | ... | ... | 19 | 18 | ... |
| 9 1/8 | ... | S | 60 1/4 | ... | ... | 20 1/4 |
| 9 3/8 | ... | S-1/2 | ... | ... | ... | ... |
| 9 1/2 | .764 | ... | ... | 19 1/2 | 19 | ... |
| 9 5/8 | ... | T | 61 1/2 | ... | ... | 21 1/2 |
| 10 | .781 | T-1/2 | ... | 20 | 20 | ... |
| 10 1/4 | ... | U | 62 3/4 | ... | 21 | 22 3/4 |
| 10 1/2 | .797 | U-1/2 | ... | 20 1/4 | 22 | ... |
| 10 5/8 | ... | V | 63 3/4 | ... | ... | 23 3/4 |
| 11 | .814 | V-1/2 | ... | 20 3/4 | 23 | ... |
| 11 1/8 | ... | W | 65 | ... | ... | 25 |
| 11 3/8 | ... | W-1/2 | ... | ... | ... | ... |
| 11 1/2 | .830 | ... | ... | 21 | 24 | ... |
| 11 5/8 | ... | X | 66 1/4 | ... | ... | 26 1/4 |
| 11 7/8 | ... | X-1/2 | ... | ... | ... | ... |
| 12 | .846 | Y | 67 1/2 | 21 1/4 | 25 | 27 1/2 |
| 12 1/4 | ... | Y-1/2 | ... | ... | ... | ... |
| 12 1/2 | .862 | Z | 68 3/4 | 21 3/4 | 26 | 28 3/4 |
| 12 3/4 | ... | Z-1/2 | ... | ... | ... | ... |
| 13 | .879 | ... | ... | 22 | 27 | ... |