Akubra hats are sized and ordered by cm circumference of the wearer’s head. The head is measured using a dress-makers tape, wrapped across the bare forehead and just above the ears. The measurement is rounded up to the next largest full cm (E.G. 57½ cm head measurement is ordered as a 58 cm hat).
International Hat Size Conversion
| AKUBRA | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 |
| Approx: | XS | S | M | L | XL | XXL | |||||
| U.K. Hat: | 6 ½ | 6 ⅝ | 6 ¾ | 6 ⅞ | 7 | 7 ⅛ | 7 ¼ | 7 ⅜ | 7 ½ | 7 ⅝ | 7 ¾ |
| U.S. Hat: | 6 ⅝ | 6 ¾ | 6 ⅞ | 7 | 7 ⅛ | 7 ¼ | 7 ⅜ | 7 ½ | 7 ⅝ | 7 ¾ | 7 ⅞ |