Hat Size Converter
Convert head measurements in CM or Inches to US, UK, and Alpha hat sizes.
Hat Size Calculator
How to Measure
Wrap a soft measuring tape around your head, positioned mid-forehead and just above your ears. Measurement should be firm but not tight.
Hat Fitting
If you are between sizes, it is generally better to go **up** a size. You can always use a hat reducer or padding for a tighter fit.
International Hat Size Converter
Convert head circumference in inches and centimeters to US, UK, and Alpha (S/M/L) hat sizes.
Wrap Tape
Wrap a measuring tape around your head just above the ears.
Convert
Input the measurement to see your fitted and alpha hat sizes.
Frequently Asked Questions
No, UK hat sizes are slightly smaller than US sizes for the same circumference.
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