Milligrams per milliliter to grams per cup conversion calculator above calculates how many grams per cup are in 'X' milligrams per milliliter (where 'X' is the number of milligrams per milliliter to convert to grams per cup). In order to convert a value from milligrams per milliliter to grams per cup (from mg/mL to g/cup) simply type the number of mg/mL to be converted to g/cup and then click on the 'convert' button.