Hat - Hat Size

Hat Size

Hat sizes are determined by measuring the circumference of a person's head about 1/2 inch (1.3 cm) above the ears. Inches or centimeters may be used depending on the manufacturer. Felt hats can be stretched for a custom fit. Some hats, like hard hats and baseball caps, are adjustable. Cheaper hats come in "standard sizes", such as small, medium, large, extra large: the mapping of measured size to the various "standard sizes" varies from maker to maker and style to style, as can be seen by studying various catalogues, such as Hammacher-Schlemmer.

Traditional hat size is worked out by adding the fore and aft and side to side measurements (in inches) then dividing by two. In the UK, an equivalent hat size is an eighth of an inch smaller than in the US.

Hat sizes
size Youth S/M Youth L/XL XXS XS S M L XL XXL XXXL
Age (years) 0 ½ 1 2
Circumference in cm 34 43 47 48 49 50 51 - 52 53 - 54 55 - 56 57 - 58 59 - 60 61 - 62 63 - 64 65 - 66
Circumference in inches 13⅜ 17 18½ 18¾ 19¼ 19¾ 20 - 20½ 20 - 21¼ 21 - 22 22 - 22½⅞ 23 - 23½⅝ 24 - 24⅜ 24¾ - 25¼ 25 - 26
UK hat size 5 6 6 6 - 6¼⅜ 6 - 6½⅝ 6 - 6¾⅞ 7 - 7⅛ 7 - 7¼⅜ 7 - 7½ 7 - 7¾⅞ 8 - 8⅛
US hat size 5⅞ 6 6⅛ 6 - 6½ 6⅝- 6¾ 6 - 7 7 - 7¼ 7 - 7½ 7 - 7¾ 7 - 8 8 - 8¼
French hat size 0 ½ 1 2 - 2½ 3 - 3½ 4 - 4½ 5 - 5½ 6 - 6½ 7 - 7½ 8 - 8½ 9 - 9½

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