Hat Size Calculator
Head Circumference
Unit
Hat size is based on head circumference. US/UK sizes represent approximate head diameter in fractions of an inch; EU sizes equal head circumference in centimetres.
- 1Measure head circumference just above the ears
- 2US/UK size ≈ circumference (inches) / π
- 3EU size = circumference in cm
- 4Hat should sit levelly 1–2 cm above the ears
Head circumference 57 cm (22.4")=EU: 57; US/UK: 7⅛
| Circumference (cm) | US/UK size | EU size |
|---|---|---|
| 54–55 | 6¾ | 54/55 |
| 56–57 | 7 | 56/57 |
| 58–59 | 7¼ | 58/59 |
| 60–61 | 7½ | 60/61 |
| 62–63 | 7¾ | 62/63 |
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