Mm25
One Too Many
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That calculator should be a sticky somewhere. Very useful.They work ok, but even the vintage American made ones are not super accurate.
Honestly the best way to measure the circumference of a sweatband is to take the measurements with a tailors tape. Measure the "major" axis and "minor" axis and punch those two numbers into this calculator. It will give you the perimeter/circumference of the sweatband.
http://www.cleavebooks.co.uk/scol/callipse.htm