Whether you're buying a fitted baseball cap, a classic fedora, or a beanie, head measurement is key to comfort. Our International Hat Size Converter takes your head circumference in inches or centimeters and instantly provides your corresponding US, UK, and Alpha (S-XXL) sizes. No more tight caps or slipping brims; find your exact fit based on professional millinery standards.
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Hat Size Converter
Convert head measurements in CM or Inches to US, UK, and Alpha hat sizes.
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Hat Size Calculator
cm57
inches22 1/2
us7 1/8
uk7
alphaM
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.
About International Hat Size Converter
1
Wrap Tape
Wrap a measuring tape around your head just above the ears.
2
Convert
Input the measurement to see your fitted and alpha hat sizes.
3
Review Results
Verify the output looks correct before using or downloading it.
4
Save Your Output
Click the download or copy button to export your results to your device or clipboard.
Key Features
Circumference to Size
Translates raw head measurements directly into fitted hat numbers.
US vs UK Standards
Accounts for the subtle sizing differences between American and British headwear manufacturers.
Alpha Scaling
Includes S, M, L, and XL mappings for flexible caps and winter hats.
Frequently Asked Questions
No, UK hat sizes are slightly smaller than US sizes for the same circumference.
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