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