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How to measure hat size?
I takes over 2 years to answer this?! Men's hat size: 1. Measure around the largest circumference of the head (say at about an inch above the eyebrows) in inches. 2. Pretend that's a circle, and take the diameter, i.e., divide by pi. That's the size. So, say 23"รท3.1416=7.3211", or about 7 3/8.