| Suggested Size Scale | ||
| Mens | Child | |
| Small | 6-3/4 to 6-7/8 | 6 |
| Medium | 7 to 7-1/8 | 6-1/4 |
| Large | 7-1/4 to 7-3/8 | 6-1/2 |
| X-Large | 7-1/2 to 7-5/8 | 6-3/4 |
| Circumference of American Sizes* | |||||
| American Nearest Sizes | English Sizes | French Sizes | Metric Sizes | Decimal Inch Sizes | 8th Inch Size |
| 6 | 5-7/8 | 1/2 | 48 | 18.7334 | 18-6/8 |
| 6-1/8 | 6 | 1 | 49 | 19.1261 | 19-1/8 |
| 6-1/4 | 6-1/8 | 1-1/2 | 50 | 19.5188 | 19-4/8 |
| 6-3/8 | 6-1/4 | 2 | 51 | 19.9115 | 19-7/8 |
| 6-1/2 | 6-3/8 | 2-1/2 | 52 | 20.3042 | 20-2/8 |
| 6-5/8 | 6-1/2 | 3 | 53 | 20.6969 | 20-6/8 |
| 6-3/4 | 6-5/8 | 3-1/2 | 54 | 21.0896 | 21-1/8 |
| 6-7/8 | 6-3/4 | 4 | 55 | 21.4823 | 21-4/8 |
| 7 | 6-7/8 | 4-1/2 | 56 | 21.8750 | 21-7/8 |
| 7-1/8 | 7 | 5 | 57 | 22.2677 | 22-2/8 |
| 7-1/4 | 7-1/8 | 5-1/2 | 58 | 22.6604 | 22-5/8 |
| 7-3/8 | 7-1/4 | 6 | 59 | 23.0531 | 23 |
| 7-1/2 | 7-3/8 | 6-1/2 | 60 | 23.4458 | 23-4/8 |
| 7-5/8 | 7-1/2 | 7 | 61 | 23.8385 | 23-7/8 |
| 7-3/4 | 7-5/8 | 7-1/2 | 62 | 24.2312 | 24-2/8 |
| 7-7/8 | 7-3/4 | 8 | 63 | 24.6239 | 24-5/8 |
| 8 | 7-7/8 | 8-1/2 | 64 | 25.0166 | 25 |
| * Measurements given are for the inside of the leather of the finished hat, the part that touches the head. The hat block is made larger than the figures stated, so that the hat will be the size indicated after the leather is inserted. | |||||