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Hat Size for a 54 cm Head
Hat Size for a 54 cm Head — US, UK and EU hat size with letter equivalent.
54 cm head: US 6 ¾ / EU 54
54 cm (21.3 in) head → US 6 ¾, UK 6 ⅝, EU 54 · Letter S
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 ¾ |
| UK | 6 ⅝ |
| EU (cm) | 54 |
| Letter | S |
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