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