Shopping for a cap, beanie or formal hat? Our free Hat Size Converter turns your head measurement into US, UK and international hat sizes in one click — enter your head circumference and find your closest match. Please note that sizes are approximate and can vary by brand.
Hat Size Converter
Measure around your head just above the eyebrows and ears. Sizes are approximate and vary by brand — always check the retailer’s own size chart.
How to Use
- Measure around your head just above the eyebrows and ears, in centimetres.
- Enter the measurement in the box.
- Click Convert Size to see your closest US/UK and international size.
- Remember that sizes are approximate — check the retailer’s chart.
Key Features
- Converts head circumference to US/UK fitted and international sizes.
- Finds your closest match automatically.
- Covers head sizes from 52 to 64 cm.
- Clearly labelled as approximate, since brands vary.
- Runs entirely in your browser — free with no sign-up.
FAQs
How do I measure my head for a hat?
Wrap a soft tape measure around your head about 1 cm above your eyebrows and ears, keeping it level all the way round. Take the measurement in centimetres and enter it above.
What is the difference between fitted and international sizes?
Fitted sizes such as 7 1/4 are precise measurements, while international sizes (XS to XXL) group several fitted sizes together. This converter shows you both.
Are converted hat sizes exact?
No — conversions are approximate. Crown shapes and materials differ between brands, so a size that fits in one brand may feel tight or loose in another.
Do I need an account to use this tool?
No. Like every tool on ToolsFreeHub, the Hat Size Converter is free and works without signing up.