Hat Size Converter
Convert hat sizes between US, UK and centimeter head measurements.
–EU / cm size
–Inches
–Fitted (S–XL)
How to use
Enter a US size or head circumference in cm — all sizes appear; everything runs in your browser.
Frequently asked questions
How do I measure my head?
Wrap a tape around your head just above the eyebrows and ears — that is your size in cm.
Are US and UK hat sizes the same?
Yes — both use the head circumference in inches divided by pi.
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