Ounces per cup (US) to milligrams per liter conversion calculator shown above calculates how many milligrams per liter are in 'X' ounces per cup (US) (where 'X' is the number of ounces per cup (US) to convert to milligrams per liter). In order to convert a value from ounces per cup (US) to milligrams per liter (from oz/cup to mg/L) just type the number of oz/cup to be converted to mg/L and then click on the 'convert' button.