HAT SIZES – COMPARATIVE CHART

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