Hat Size Converter
Convert hat sizes between US, UK, and EU. Or enter your head circumference to find the right hat size.
100% client-side · no upload
Equivalent sizes
US
UK
EU
cm
Or find size from head circumference
How to use
- Select a sizing system and your hat size to see equivalents in all standards.
- Or measure your head circumference with a tape measure and enter it below.
- Measure at the widest part of your head, just above the ears and eyebrows.
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常見問題
- Is the hat size converter free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All conversions run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.