This size chart below converts between US, European, UK and Japanese hat sizes for men.
Men’s hat sizes
| USA | 6 1/2 (XS) | 6 3/4 (S) | 7 (M) | 7 1/4 (M) | 7 1/2 (L) | 7 3/4 (XL) |
|---|---|---|---|---|---|---|
| European | 53 | 55 | 57 | 59 | 61 | 63 |
| UK | 6 3/8 | 6 5/8 | 6 7/8 | 7 1/8 | 7 3/8 | 7 5/8 |
| Japan | 53 | 55 | 57 | 59 | 61 | 63 |