| Size (US) | Diameter (mm) | Circumference (mm) | Diameter (inches) | Circumference (inches) |
|---|---|---|---|---|
| 5 | 15.7 | 49.3 | 0.62 | 1.94 |
| 5.5 | 16.1 | 50.6 | 0.63 | 1.99 |
| 6 | 16.5 | 51.9 | 0.65 | 2.04 |
| 6.5 | 16.9 | 53.1 | 0.67 | 2.09 |
| 7 | 17.3 | 54.4 | 0.68 | 2.14 |
| 7.5 | 17.7 | 55.7 | 0.7 | 2.19 |
| 8 | 18.1 | 57 | 0.71 | 2.24 |
| 8.5 | 18.5 | 58.3 | 0.73 | 2.29 |
| 9 | 18.9 | 59.5 | 0.75 | 2.34 |
| 9.5 | 19.4 | 60.8 | 0.76 | 2.39 |
| 10 | 19.8 | 62.1 | 0.78 | 2.44 |
| 10.5 | 20.2 | 63.4 | 0.79 | 2.49 |
| 11 | 20.6 | 64.6 | 0.81 | 2.54 |
| 11.5 | 21 | 65.9 | 0.83 | 2.59 |
| 12 | 21.4 | 67.2 | 0.84 | 2.64 |
| 12.5 | 21.8 | 68.5 | 0.86 | 2.7 |
| 13 | 22.2 | 69.7 | 0.87 | 2.75 |
| 13.5 | 22.6 | 71 | 0.89 | 2.8 |
| 14 | 23 | 72.3 | 0.91 | 2.85 |
| 14.5 | 23.4 | 73.6 | 0.92 | 2.9 |
| 15 | 23.8 | 74.8 | 0.94 | 2.95 |
| 15.5 | 24.2 | 76.1 | 0.95 | 3 |
| 16 | 24.6 | 77.4 | 0.97 | 3.05 |
| 16.5 | 25 | 78.7 | 0.99 | 3.1 |
| 17 | 25.4 | 79.9 | 1 | 3.15 |
| 17.5 | 25.9 | 81.2 | 1.02 | 3.2 |
| 18 | 26.3 | 82.5 | 1.03 | 3.25 |
| 18.5 | 26.7 | 83.8 | 1.05 | 3.3 |
| 19 | 27.1 | 85 | 1.07 | 3.35 |
| 19.5 | 27.5 | 86.3 | 1.08 | 3.4 |
| 20 | 27.9 | 87.6 | 1.1 | 3.45 |
| 20.5 | 28.3 | 88.9 | 1.11 | 3.5 |
| 21 | 28.7 | 90.1 | 1.13 | 3.55 |
| 21.5 | 29.1 | 91.4 | 1.15 | 3.6 |
| 22 | 29.5 | 92.7 | 1.16 | 3.65 |
| 22.5 | 29.9 | 94 | 1.18 | 3.7 |
| 23 | 30.3 | 95.2 | 1.19 | 3.75 |
| 23.5 | 30.7 | 96.5 | 1.21 | 3.8 |
| 24 | 31.1 | 97.8 | 1.23 | 3.85 |