US size (diam, in.) |
Circ, in. | Euro size (circ, cm) |
Diam, cm | Head circ, in. |
Universal size |
US size | UK size | French size |
6 | 18.850 | 48 | 15.2 | 18-5/8 | 5-7/8 | |||
6-1/8 | 19.242 | 49 | 15.6 | 19 | 6 | 1.0 | ||
6-1/4 | 19.635 | 50 | 15.9 | 19-1/2 | Child | 6-1/8 | 1.5 | |
6-3/8 | 20.028 | 51 | 16.2 | 19-7/8 | 6-1/4 | 2.0 | ||
6-1/2 | 20.420 | 52 | 16.5 | 20-1/4 | X-Small | 6-3/8 | 2.5 | |
6-5/8 | 20.813 | 53 | 16.8 | 20-5/8 | 6-1/2 | 3.0 | ||
6-3/4 | 21.206 | 54 | 17.1 | 21 | Small | 6-5/8 | 3.5 | |
6-7/8 | 21.598 | 55 | 17.5 | 21-1/2 | SMALL | 6-3/4 | 4.0 | |
7 | 21.991 | 56 | 17.8 | 21-7/8 | Medium | 6-7/8 | 4.5 | |
7-1/8 | 22.384 | 57 | 18.1 | 22-1/4 | MEDIUM | 7 | 5.0 | |
7-1/4 | 22.777 | 58 | 18.4 | 22-5/8 | Large | 7-1/8 | 5.5 | |
7-3/8 | 23.169 | 59 | 18.7 | 23 | LARGE | 7-1/4 | 6.0 | |
7-1/2 | 23.562 | 60 | 19.1 | 23-1/2 | X-Large | 7-3/8 | 6.5 | |
7-5/8 | 23.955 | 61 | 19.4 | 23-7/8 | X-LARGE | 7-1/2 | 7.0 | |
7-3/4 | 24.347 | 62 | 19.7 | 24-1/4 | XX-Large | 7-5/8 | 7.5 | |
7-7/8 | 24.740 | 63 | 20.0 | 24-5/8 | XX-LARGE | 7-3/4 | 8.0 | |
8 | 25.133 | 64 | 20.3 | 25 | XXX-Large | 7-7/8 | 8.5 |