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