Hat Size Converter
Convert hat head sizes: S 54cm to M 57cm, plus L 60cm, XL 63cm with instant comparison to centimeters and inches.
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About Hat Size conversion
Head circumference drives hat sizing: XS ~53cm (20.8″, US 6 5/8), S ~54–56cm (US 6 3/4–7), M ~57–58cm (US 7 1/8–7 1/4), L ~59–60cm (US 7 3/8–7 1/2), XL ~61–63cm (US 7 5/8–7 7/8), XXL ~64cm (US 8). European hats use cm directly (EU 57 =57cm).
These master values come from international hat charts (TailorSizeGuide, HatShopping) where EU size equals cm and US fitted =cm/2.54/π (~diameter). Most adults wear M–L (57–60cm, 22–23.6″). 1 L =1.11×S (60/54).
Units supported: Head cm, head inches, and letter sizes XS (53cm), S (54cm), M (57cm), L (60cm), XL (63cm), XXL (64cm) plus US fitted and EU cm equivalents.
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Frequently asked questions
What units can I convert with the Hat Size converter?
Head cm, head inches, and letter sizes XS (53cm), S (54cm), M (57cm), L (60cm), XL (63cm), XXL (64cm) plus US fitted and EU cm equivalents.
How accurate is this undefined converter?
This converter uses standard international definitions for every undefined unit, so results are precise to several decimal places, accurate enough for cooking, travel, homework, or any everyday use.
Can I convert in both directions?
Yes, enter a value in either field and the other updates instantly. You can also tap the swap button to flip the two units, or use the copy-link button to share this exact conversion.