Centimetres

What size hat is 54 cm?

Entered 54 cm into a hat seller's box? Here is what it means in US, UK and EU hat sizes.

A 54 cm head takes US fitted hat size 6 3/4 (head circumference 21 1/4 inches, UK size 6 5/8, EU 54, letter roughly S).

US fitted

6 3/4

for a 54 cm head

In cm…

= 21.3

UK size

6 5/8

= US minus 1/8

EU size

≠ 54 — EU rounds the chart row's cm

Sizes near 54 cm

Hat size chart: US, UK and EU hat sizes with head circumference in centimetres and inches
US	UK	Head (cm)	Head (inches)	EU	Letter
6 5/8 hat size	6 1/2	53.0	20 7/8	53	S
6 3/4 hat size	6 5/8	53.9	21 1/4	54	S
6 7/8 hat size	6 3/4	54.9	21 5/8	55	S

Scroll sideways inside the table on small screens if you do not see every column. Letter sizes vary by brand; check the brand's own chart.

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