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Hat size calculator

Answers the question: What is my hat size?

Find your hat size by measuring the circumference of your head. Start the measurement two centimeters above your eyebrows. Then use this hat size calculator to find your hat size in US, UK, and international sizes.

Results

International hat size: XS
US hat size: 6 1/2 - 6 5/8
UK hat size: 6 3/8 - 6 1/2

These hat sizes were calculated using the hat size tables below.


Our calculations

At Calculatorian, we are keen to share our knowledge, be transparent and open to feedback. Here are the lookup tables used to create this calculator. If you find an error or deficiency, contact us and we'll fix it in an instant!

International hat size

FromToValue
3153XS
5455S
5657M
5859L
6061XL
6263XXL
6470XXXL

US hat size

FromToValue
31536 1/2 - 6 5/8
54556 3/4 - 6 7/8
56577 - 7 1/8
58597 1/4 - 7 3/8
60617 1/2 - 7 5/8
62637 3/4 - 8
64708 1/8

UK hat size

FromToValue
31536 3/8 - 6 1/2
54556 5/8 - 6 3/4
56576 7/8 - 7
58597 1/8 - 7 1/4
60617 3/8 - 7 1/2
62637 5/8 - 7 3/4
64707 7/8