| Circumference (mm) | Diameter (mm) | UK, Europe, & Australia | United States & Canada | CN/SG/JP | HK | Switzerland |
|---|---|---|---|---|---|---|
| 44.2 | 14.1 | F | 3 | 4 | 6 | 4 |
| 44.8 | 14.3 | F½ | 5 | 5¼ | ||
| 45.5 | 14.5 | G | 3½ | 7.5 | ||
| 46.1 | 14.7 | G½ | 6 | 6½ | ||
| 46.8 | 14.9 | H | 4 | 7 | 9 | |
| 47.4 | 15.1 | H½ | 7¾ | |||
| 48.0 | 15.3 | I | 4½ | 8 | 10 | |
| 48.7 | 15.5 | J | 9 | |||
| 49.3 | 15.7 | J½ | 5 | 9 | 11 | |
| 50.0 | 15.9 | K | 10 | |||
| 50.6 | 16.1 | K½ | 5½ | 10 | 12 | |
| 51.2 | 16.3 | L | 11¾ | |||
| 51.9 | 16.5 | L½ | 6 | 11 | 13 | 12¾ |
| 52.5 | 16.7 | M | 12 | |||
| 53.1 | 16.9 | M½ | 6½ | 13 | 14.5 | 14 |
| 53.8 | 17.1 | N | ||||
| 54.4 | 17.3 | N½ | 7 | 14 | 16 | 15¼ |
| 55.1 | 17.5 | O | ||||
| 55.7 | 17.7 | O½ | 7½ | 15 | 17 | 16½ |
| 56.3 | 17.9 | P | ||||
| 57.0 | 18.1 | P½ | 8 | 16 | 17¾ | |
| 57.2 | 18.2 | 18 | ||||
| 57.6 | 18.3 | Q | ||||
| 58.3 | 18.5 | Q½ | 8½ | 17 | 19 | |
| 58.9 | 18.8 | R | 19 | |||
| 59.5 | 19.0 | R½ | 9 | 18 | 20.5 | |
| 60.2 | 19.2 | S | 20¼ | |||
| 60.8 | 19.4 | S½ | 9½ | 19 | 22 | |
| 61.4 | 19.6 | T | 21½ | |||
| 62.1 | 19.8 | T½ | 10 | 20 | 23 | |
| 62.7 | 20.0 | U | 21 | |||
| 63.4 | 20.2 | U½ | 10½ | 22 | 24 | 22¾ |
| 64.0 | 20.4 | V | ||||
| 64.6 | 20.6 | V½ | 11 | 23 | 25 | |
| 65.3 | 20.8 | W | 25 | |||
| 65.9 | 21.0 | W½ | 11½ | 24 | 26 | |
| 66.6 | 21.2 | X | ||||
| 67.2 | 21.4 | X½ | 12 | 25 | 27.75 | 27½ |
| 67.8 | 21.6 | Y | ||||
| 68.5 | 21.8 | Z | 12½ | 26 | 28¾ | |
| 69.1 | 22.0 | Z½ | ||||
| 69.7 | 22.2 | 13 | 27 | 30 | ||
| 70.4 | 22.4 | Z+1 | ||||
| 71.0 | 22.6 | 13½ |