What is a 58 cm hat in US sizing?

A 58 cm head is a US 7 1/4 and a UK 7 1/8, usually labelled M or L.

Do fitted caps use the same scale?

Fitted baseball caps use the US fractional scale, so the same conversion applies.

What if I'm between sizes?

Choose the larger size — most quality hats include a sizing tape to take up the difference.

Converters

Hat Size Converter

Hats are sized by head circumference — fractional inches in the US and UK, plain centimetres in Europe. Measure once and convert across every system.

Hats size chart

Hats size chart
INTL	US	UK	EU	AU	JP	KR	CN	IN	CA	MX	BR	IT	FR	RU	TR	ZA	Head (cm)
XS	6 3/4	6 5/8	54	6 5/8	54	54	54	54	6 3/4	54	54	54	54	54	54	6 5/8	54
S	6 7/8	6 3/4	55	6 3/4	55	55	55	55	6 7/8	55	55	55	55	55	55	6 3/4	55
S	7	6 7/8	56	6 7/8	56	56	56	56	7	56	56	56	56	56	56	6 7/8	56
M	7 1/8	7	57	7	57	57	57	57	7 1/8	57	57	57	57	57	57	7	57
M	7 1/4	7 1/8	58	7 1/8	58	58	58	58	7 1/4	58	58	58	58	58	58	7 1/8	58
L	7 3/8	7 1/4	59	7 1/4	59	59	59	59	7 3/8	59	59	59	59	59	59	7 1/4	59
L	7 1/2	7 3/8	60	7 3/8	60	60	60	60	7 1/2	60	60	60	60	60	60	7 3/8	60
XL	7 5/8	7 1/2	61	7 1/2	61	61	61	61	7 5/8	61	61	61	61	61	61	7 1/2	61
XXL	7 3/4	7 5/8	62	7 5/8	62	62	62	62	7 3/4	62	62	62	62	62	62	7 5/8	62

How to use this converter

Wrap a tape around your head about 1 cm above the ears and eyebrows.
Note the circumference in centimetres.
Find the matching row to read US, UK and EU hat sizes.
Choose the larger size if you sit between two rows.

Why sizes differ between countries

Size labels come from national fit blocks developed decades ago from different population surveys. The US and UK use garment-based numbering, most of Europe derives sizes from body measurements in centimetres, and Japan, Korea and China use their own regional standards. Because no global standard exists, matching your measurements to the chart is always more reliable than matching the label.

Frequently asked questions

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