In the United States, numerical men's hat sizes are the diameter of the sweat band inside the hat, if it were formed into a perfect circle. Women's hat sizes are simply the circumference of the inner band.
| Size | Circumference (inches) |
Size |
|---|---|---|
| 6 | 19 | |
| 6⅛ | 19⅜ | |
| 6¼ | 19¾ | |
| 6⅜ | 20⅛ | |
| 6½ | 20½ | XS |
| 6⅝ | 20⅞ | XS |
| 6¾ | 21¼ | S |
| 6⅞ | 21⅝ | S |
| 7 | 22 | M |
| 7⅛ | 22⅜ | M |
| 7¼ | 22¾ | L |
| 7⅜ | 23⅛ | L |
| 7½ | 23½ | XL |
| 7⅝ | 23⅞ | XL |
| 7¾ | 24¼ | XXL |
| 7⅞ | 24⅝ | XXL |
| 8 | 25 |
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Last revised: 20 November 20, 2000.