| Dia (mm) | Circ (mm) | US & CA | UK & AU | Europe |
|---|---|---|---|---|
| 14.1 | 44.2 | 3 | F | 44 |
| 14.3 | 44.8 | 3.25 | F½ | 45 |
| 14.5 | 45.5 | 3.5 | G | |
| 14.7 | 46.1 | 3.75 | G½ | 46 |
| 14.9 | 46.8 | 4 | H | 47 |
| 15.1 | 47.4 | 4.25 | H½ | |
| 15.3 | 48.0 | 4.5 | I | 48 |
| 15.5 | 48.7 | 4.75 | I½ | |
| 15.7 | 49.3 | 5 | J | 49 |
| 15.9 | 50.0 | 5.25 | J½ | 50 |
| 16.1 | 50.6 | 5.5 | K | |
| 16.3 | 51.2 | 5.75 | K½ | 51 |
| 16.5 | 51.9 | 6 | L | 52 |
| 16.7 | 52.5 | 6.25 | L½ | |
| 16.9 | 53.1 | 6.5 | M | 53 |
| 17.1 | 53.8 | 6.75 | M½ | |
| 17.3 | 54.4 | 7 | N | 54 |
| 17.5 | 55.1 | 7.25 | N½ | 55 |
| 17.7 | 55.7 | 7.5 | O | |
| 17.9 | 56.3 | 7.75 | O½ | 56 |
| 18.1 | 57.0 | 8 | P | 57 |
| 18.3 | 57.6 | 8.25 | Q | |
| 18.5 | 58.3 | 8.5 | Q½ | |
| 18.7 | 58.9 | 8.75 | R | 58 |
| 18.9 | 59.5 | 9 | R½ | 59 |
| 19.1 | 60.2 | 9.25 | S | |
| 19.4 | 60.8 | 9.5 | S½ | 60 |
| 19.6 | 61.4 | 9.75 | T | 61 |
| 19.8 | 62.1 | 10 | T½ | |
| 20.0 | 62.7 | 10.25 | U | 62 |
| 20.2 | 63.4 | 10.5 | U½ | |
| 20.4 | 64.0 | 10.75 | V | 63 |
| 20.6 | 64.6 | 11 | V½ | 64 |
| 20.8 | 65.3 | 11.25 | W | |
| 21.0 | 65.9 | 11.5 | W½ | 65 |
| 21.2 | 66.6 | 11.75 | X | 66 |
| 21.4 | 67.2 | 12 | X½ | |
| 21.6 | 67.9 | 12.25 | Y | 67 |
| 21.8 | 68.5 | 12.5 | Z | |
| 22.0 | 69.1 | 12.75 | Z½ | 68 |
| 22.2 | 69.8 | 13 | 69 | |
| 22.4 | 70.4 | 13.25 | 70 | |
| 22.6 | 71.0 | 13.5 | ||
| 22.8 | 71.7 | 13.75 | ||
| 23.0 | 72.3 | 14 | ||
| 23.2 | 72.8 | 14.25 | ||
| 23.4 | 73.5 | 14.5 | ||
| 23.6 | 74.1 | 14.75 | ||
| 23.8 | 74.7 | 15 |
