>How does one convert oz/ft2 into mils as it relates to the thickness of
>copper on a PCB?

It should be converted thru copper density, which is 8 920 
kilogram/cubic meter = 8 910 oz/ft3.

>to add that feature for the other unit selectable fields, one of which is
>oz/ft2 or mils for copper thickness.

Yet another way is thickness in micrometers.

Josef


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