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Hat Size Converter
Measure around your head just above the ears and eyebrows, then find your size in any system.
Hat sizes chart
| Head (cm) / EU | Head (in) | US | UK | Letter |
|---|---|---|---|---|
| 53 | 20 7/8 | 6 5/8 | 6 1/2 | XS |
| 54 | 21 1/4 | 6 3/4 | 6 5/8 | S |
| 55 | 21 5/8 | 6 7/8 | 6 3/4 | S |
| 56 | 22 | 7 | 6 7/8 | M |
| 57 | 22 1/2 | 7 1/8 | 7 | M |
| 58 | 22 7/8 | 7 1/4 | 7 1/8 | L |
| 59 | 23 1/4 | 7 3/8 | 7 1/4 | L |
| 60 | 23 5/8 | 7 1/2 | 7 3/8 | XL |
| 61 | 24 | 7 5/8 | 7 1/2 | XL |
| 62 | 24 3/8 | 7 3/4 | 7 5/8 | XXL |
| 63 | 24 3/4 | 7 7/8 | 7 3/4 | XXL |
| 64 | 25 1/4 | 8 | 7 7/8 | 3XL |
How hat sizes work
European hats are sized by head circumference in centimetres. US fitted sizes are the circumference in inches divided by π (roughly the head's diameter), and UK sizes run one eighth smaller than US. A 57 cm head is a US 7 1/8 and a UK 7.
Frequently asked questions
What size is a 58 cm hat?
58 cm is a US 7 1/4, UK 7 1/8, usually a Large.
What is an average hat size?
Most adults fall between 55 and 59 cm. Men average around 57 to 58 cm.