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    Lifestyle

    International Hat Size Conversion Guide

    UnitConvertLab Team
    2026-05-10
    4 min read

    How to Measure Your Head

    Wrap a soft measuring tape around your head, about half an inch above your eyebrows and ears. This is your circumference.

    Size Comparison

    Circumference (cm)US SizeUK SizeEU Size
    556 7/86 3/455
    577 1/8757
    597 3/87 1/459
    617 5/87 1/261

    Pro Tip

    If you're between sizes, go up and use a hat reducer (a small foam strip) for a perfect fit.

    Key Takeaways

    • US sizes are slightly larger than UK sizes
    • EU sizes are just the circumference in cm
    • Specialized sports caps (like New Era) use specific US sizing