A person's hat size can be determined based on the head circumference.
In Europe the hat size is the head circumference in centimeters.
US hat size =
= ROUND ((head circumference in inches) / (PI)) to next eighth inch
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Hat Size in inches
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Description
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6 5/8 and 6 7/8
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small
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7
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small-medium
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7 1/8
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medium
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7 1/4
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medium-large
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7 3/8
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large
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7 1/2 and 7 5/8 and 7 3/4
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x-large
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7 7/8 and 8
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xx-large
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Variability in hat size:
(1) national differences (US hat sizes are about 1/8 inch larger than British hat sizes for the same head size)
(2) type of hat
(3) manufacturers (variability greater for low price caps than for quality headwear).
