Measure your hat size

Hat size is based on the circumference of the head.
In order to determine your proper hat size you must take this measurement. Using a tape measure, measure your head about one-half inch above your eyebrows where your hat will rest.
Be certain the the tape measure is flat, not twisted.

Alternatively you can use a piece of string to measure your head and then measure the length of string with a ruler. If you are not certain about your size, or are between sizes then buy the larger size.
Use the chart below to determine your hat size based on the measurement you have taken.

Head Size in inches

US Hat Size

General Hat Size

Metric Size in centimeters

20 7/8

6 5/8

Small

53 cm

21 1/8

6 3/4

Small

54 cm

21 1/2

6 7/8

Small

55 cm

21 7/8

7

Medium

56 cm

22 1/4

7 1/8

Medium

57 cm

22 5/8

7 1/4

Large

58 cm

23

7 3/8

Large

59 cm

23 1/2

7 1/2

Extra Large

60 cm

23 7/8

7 5/8

Extra Large

61 cm

24 1/4

7 3/4

Extra Large

62 cm

24 5/8

7 7/8

Extra Extra Large

63 cm

25

8

Extra Extra Large

64 cm