Kevin Wampler wrote:
> For entirely boring reasons, I was looking at the table of hat size 
> conversions appropriately located at http://hatsizes.com/
> 
> I used a simple regression to reverse engineer the equation from this 
> table, and it seems to be:
> 
> US_size = circumference_inches / pi + 0.037
> 
> So, the division by pi makes sense to me, but does anyone have any idea 
> where the + 0.037 comes from?

Minimum size of a human skull?

Circumference / pi is what we maths bods like to refer to as 
"diammeter". So the hat size is the hat diammeter plus a small offset. 
(What unit is that by the way? 0.037 inches?)

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