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🧢 Hat Size Converter
Convert hat sizes between international alpha labels, US fitted sizes, EU numbers, and head circumference measurements.
International Hat Size Converter
Convert between international alpha hat sizes, US fitted sizes, EU numeric labels, and head circumference measurements. Choose the scale you know and we'll show the matching head size ranges.
Hat size equivalents
- International (Alpha)XS
- US Fitted6 5/8
- EU53
- Head circumference (cm)53
- Head circumference (in)20 7/8
How to use this tool
- Pick the sizing system you know—alpha, fitted, numeric, or circumference.
- Select your size to reveal matching measurements across every standard.
- Copy or download the equivalents for quick reference while shopping online.
Useful when
- Buying hats from international brands that publish only one sizing scale.
- Outfitting teams or events where everyone needs consistent headwear.
- Comparing fitted cap sizes to metric measurements before custom embroidery.
Measuring tips
- Use a soft tape measure and keep it snug but not tight to mimic actual fit.
- Measure twice—morning and evening—to account for natural swelling throughout the day.
- If your measurement falls between values, size up and add a sweatband for a secure fit.
FAQ
- Do sizes differ between manufacturers?
- Slight variations are common. Use this chart as a baseline, then check the brand's specific recommendations.
- Can I convert kids' sizes?
- The table focuses on adult ranges. For children, measure the head circumference and compare with the centimeter values.
- How accurate are the inch fractions?
- Fractions are rounded to the nearest eighth of an inch—the standard increment for fitted caps.
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