mils is a colloquial term and as such could have more than one meaning. It is possibly short for millilitres (mL) and is therefore 60 mils is 60mL. 60mL is approximately 1/4… of a (non-metric) cup. A metric cup is 250mL.     mils also refers to a unit of thickness 1 mil = .001 inch. 4 people found this useful.