little shadeG U I D EFind your size ↗

MEASURE & SIZE

Start with
the measurement.

Find which published ranges contain a head circumference. Keep every overlap in view.

This is a range lookup, not an age conversion or fit guarantee. Four styles have verified ranges; two others remain unverified. Individual suitability, adjustment and sun care need separate checks.

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01

Your measurement.

Do not add a fit allowance unless the manufacturer’s instructions say to do so. The lookup compares the number you enter directly.

Original diagram of a measuring tape passing above the eyebrows and around the back of a head form
Original head-form diagram, not a medical illustration. Follow the hat maker’s measurement method. Source method .

02 · WHAT THE CHARTS SAY

Boundary endpoints are included. Multiple ranges are shown without selecting a winner. Range data checked October 26, 2026; open the official chart before buying.