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| Đường kính trong> (in) | Đường kính trong> (mm) | Chu vi trong> (in) | Chu vi trong> (mm) | Kích cỡ> Hoa Kỳ  và Canada | Kích cỡ> Anh Quốc, Ireland,  và Australia | Kích cỡ> Nhật Bản,  Trung Quốc | Kích cỡ> Thụy Sĩ |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 0.458 | 11.63 | 1.44 | 36.5 | 0 |  |  |  |
| 0.466 | 11.84 | 1.46 | 37.2 | ¼ |  |  |  |
| 0.474 | 12.04 | 1.49 | 37.8 | ½ | A |  |  |
| 0.482 | 12.24 | 1.51 | 38.5 | ¾ | A½ |  |  |
| 0.49 | 12.45 | 1.54 | 39.1 | 1 | B | 1 |  |
| 0.498 | 12.65 | 1.56 | 39.7 | 1¼ | B½ |  |  |
| 0.506 | 12.85 | 1.59 | 40.4 | 1½ | C |  |  |
| 0.514 | 13.06 | 1.61 | 41.0 | 1¾ | C½ |  |  |
| 0.522 | 13.26 | 1.64 | 41.7 | 2 | D | 2 | 1.5 |
| 0.53 | 13.46 | 1.67 | 42.3 | 2¼ | D½ |  |  |
| 0.538 | 13.67 | 1.69 | 42.9 | 2½ | E | 3 | 2.75 |
| 0.546 | 13.87 | 1.72 | 43.6 | 2¾ | E½ |  |  |
| 0.554 | 14.07 | 1.74 | 44.2 | 3 | F | 4 | 4 |
| 0.562 | 14.27 | 1.77 | 44.8 | 3¼ | F½ | 5 | 5.25 |
| 0.57 | 14.48 | 1.79 | 45.5 | 3½ | G |  |  |
| 0.578 | 14.68 | 1.82 | 46.1 | 3¾ | G½ | 6 | 6.5 |
| 0.586 | 14.88 | 1.84 | 46.8 | 4 | H | 7 |  |
| 0.594 | 15.09 | 1.87 | 47.4 | 4¼ | H½ |  | 7.75 |
| 0.602 | 15.29 | 1.89 | 48.0 | 4½ | I | 8 |  |
| 0.61 | 15.49 | 1.92 | 48.7 | 4¾ | J |  | 9 |
| 0.618 | 15.70 | 1.94 | 49.3 | 5 | J½ | 9 |  |
| 0.626 | 15.90 | 1.97 | 50.0 | 5¼ | K |  | 10 |
| 0.634 | 16.10 | 1.99 | 50.6 | 5½ | K½ | 10 |  |
| 0.642 | 16.31 | 2.02 | 51.2 | 5¾ | L |  | 11.75 |
| 0.65 | 16.51 | 2.04 | 51.9 | 6 | L½ | 11 | 12.75 |
| 0.658 | 16.71 | 2.07 | 52.5 | 6¼ | M | 12 |  |
| 0.666 | 16.92 | 2.09 | 53.1 | 6½ | M½ | 13 | 14 |
| 0.674 | 17.12 | 2.12 | 53.8 | 6¾ | N |  |  |
| 0.682 | 17.32 | 2.14 | 54.4 | 7 | N½ | 14 | 15.25 |
| 0.69 | 17.53 | 2.17 | 55.1 | 7¼ | O |  |  |
| 0.698 | 17.73 | 2.19 | 55.7 | 7½ | O½ | 15 | 16.5 |
| 0.706 | 17.93 | 2.22 | 56.3 | 7¾ | P |  |  |
| 0.714 | 18.14 | 2.24 | 57.0 | 8 | P½ | 16 | 17.75 |
| 0.722 | 18.34 | 2.27 | 57.6 | 8¼ | Q |  |  |
| 0.73 | 18.54 | 2.29 | 58.3 | 8½ | Q½ | 17 |  |
| 0.738 | 18.75 | 2.32 | 58.9 | 8¾ | R |  | 19 |
| 0.746 | 18.95 | 2.34 | 59.5 | 9 | R½ | 18 |  |
| 0.754 | 19.15 | 2.37 | 60.2 | 9¼ | S |  | 20.25 |
| 0.762 | 19.35 | 2.39 | 60.8 | 9½ | S½ | 19 |  |
| 0.77 | 19.56 | 2.42 | 61.4 | 9¾ | T |  | 21.5 |
| 0.778 | 19.76 | 2.44 | 62.1 | 10 | T½ | 20 |  |
| 0.786 | 19.96 | 2.47 | 62.7 | 10¼ | U | 21 |  |
| 0.794 | 20.17 | 2.49 | 63.4 | 10½ | U½ | 22 | 22.75 |
| 0.802 | 20.37 | 2.52 | 64.0 | 10¾ | V |  |  |
| 0.81 | 20.57 | 2.54 | 64.6 | 11 | V½ | 23 |  |
| 0.818 | 20.78 | 2.57 | 65.3 | 11¼ | W |  | 25 |
| 0.826 | 20.98 | 2.59 | 65.9 | 11½ | W½ | 24 |  |
| 0.834 | 21.18 | 2.62 | 66.6 | 11¾ | X |  |  |
| 0.842 | 21.39 | 2.65 | 67.2 | 12 | X½ | 25 | 27.5 |
| 0.85 | 21.59 | 2.67 | 67.8 | 12¼ | Y |  |  |
| 0.858 | 21.79 | 2.70 | 68.5 | 12½ | Z | 26 | 28.75 |
| 0.866 | 22.00 | 2.72 | 69.1 | 12¾ | Z½ |  |  |
| 0.874 | 22.20 | 2.75 | 69.7 | 13 |  | 27 |  |
| 0.882 | 22.40 | 2.77 | 70.4 | 13¼ | Z1 |  |  |
| 0.89 | 22.61 | 2.80 | 71.0 | 13½ |  |  |  |
| 0.898 | 22.81 | 2.82 | 71.7 | 13¾ | Z2 |  |  |
| 0.906 | 23.01 | 2.85 | 72.3 | 14 | Z3 |  |  |
| 0.914 | 23.22 | 2.87 | 72.9 | 14¼ |  |  |  |
| 0.922 | 23.42 | 2.90 | 73.6 | 14½ | Z4 |  |  |
| 0.93 | 23.62 | 2.92 | 74.2 | 14¾ |  |  |  |
| 0.938 | 23.83 | 2.95 | 74.8 | 15 |  |  |  |
| 0.946 | 24.03 | 2.97 | 75.5 | 15¼ |  |  |  |
| 0.954 | 24.23 | 3.00 | 76.1 | 15½ |  |  |  |
| 0.962 | 24.43 | 3.02 | 76.8 | 15¾ |  |  |  |
| 0.97 | 24.64 | 3.05 | 77.4 | 16 |  |  |  |