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