Hat Size Chart & Converter
Convert head circumference into US hat size, EU size and S–XXL.
Hat size chart
| Circumference (cm) | Inches | US hat | EU | S–XXL |
|---|---|---|---|---|
| 53.3 | 21 | 6⅝ | 53 | S |
| 54 | 21.25 | 6¾ | 54 | S |
| 55 | 21.625 | 6⅞ | 55 | M |
| 56 | 22 | 7 | 56 | M |
| 57 | 22.375 | 7⅛ | 57 | L |
| 58 | 22.75 | 7¼ | 58 | L |
| 59 | 23.125 | 7⅜ | 59 | XL |
| 60 | 23.5 | 7½ | 60 | XL |
| 61 | 23.875 | 7⅝ | 61 | XXL |
| 62 | 24.25 | 7¾ | 62 | XXL |
FAQ
How do I measure my head for a hat?
Wrap a soft tape measure around your head about 1 cm above your ears and eyebrows — where a hat sits. Keep it level and snug but not tight. That's your head circumference.
What is the average hat size?
Most adults fall between 55–59 cm (US 6⅞ – 7⅜). Men average slightly larger than women.
How does US hat size relate to circumference?
US hat size is roughly your head circumference in inches divided by π (about 3.14). So a 22-inch head ≈ size 7.