Head Size in Inches
Head Size in Metric
U.S.A Hat Size
21 ½
54
6 ¾
21 7/8
55
6 7/8
22 ¼
56
7
22 5/8
57
7 1/8
23
58
7 ¼
23 3/8
59
7 3/8
23 ¾
60
7 ½
24
61
7 5/8
