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Hat Size for a 55 cm Head
Hat Size for a 55 cm Head — US, UK and EU hat size with letter equivalent.
55 cm head: US 6 ⅞ / EU 55
55 cm (21.7 in) head → US 6 ⅞, UK 6 ¾, EU 55 · Letter M
Measure around the widest part of your head — about 2.5 cm above your eyebrows. Fitted caps are sized exactly; flex-fit and adjustable caps cover a range.
Hat size conversion:
| System | Size |
|---|---|
| US | 6 ⅞ |
| UK | 6 ¾ |
| EU (cm) | 55 |
| Letter | M |
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