Mil – A unit of measurement in the English system that is measured in thousandths of an inch. (i.e., .001 = one thousandth of an inch or 1.0 mil)
Micron – A unit of measurement in the metric system that is equal to one thousandth of a millimeter.
For the exact conversion:
Mils to Microns: (Number of Mils) x 25.4 (i.e., .75 mil = 19 microns)
Microns to Mils: (Number of Microns) / 25.4 (i.e., 14 microns = .55 mil)