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Hat Size Calculator
Find your hat size from head circumference with US, UK, and metric conversions.
Measure around the widest part of your head, about 1 inch above your eyebrows and ears.
Select the unit you measured in.
About This Tool
Finding your hat size can be surprisingly tricky. A hat that is too tight gives you a headache; too loose and it blows off. This men's hat size calculator converts your head circumference into US, UK, and EU sizes plus the correct S/M/L/XL generic size. Buying a hat to match your face? Our Face Shape Analyzer helps you pick the most flattering hat styles too.
How to Use
Measure around the widest part of your head about one inch above your eyebrows using a soft tape or string. Keep it snug but not tight. Enter the measurement in inches or centimeters. The calculator shows fitted hat size, generic size letter, and both metric and imperial circumferences. For glasses fit, try our Glasses Frame Size Calculator next.
FAQ
How do I measure my head for a hat?
Wrap a soft tape about one inch above your eyebrows and ears, crossing at the widest point on the back of your head. Keep it level and snug without squeezing. No tape? Use string, mark the overlap, and measure against a ruler. Measure twice for accuracy. This same measurement can help with our Glasses Frame Size Calculator.
Do hats break in and stretch over time?
Yes. Wool felt hats and fitted baseball caps stretch about a quarter size over the first few weeks. If between sizes, go smaller for wool and fitted caps. Straw and synthetic materials stretch less, so go larger for those. Fitted baseball caps from brands like New Era are sized in 1/8-inch increments for precision.
Should I buy an adjustable hat or a fitted hat?
Fitted hats give the cleanest look and are preferred for baseball caps and dress hats. Adjustable hats (snapback, strapback) offer flexibility for sizes between standard increments. If you wear a hat frequently, invest in fitted. For casual or occasional wear, adjustable is more practical. Our Outfit Builder can suggest hat styles that match your overall look.
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