Milligrams per cubic millimeter to grams per liter converter on this page calculates how many grams per liter are in 'X' milligrams per cubic millimeter (where 'X' is the number of milligrams per cubic millimeter to convert to grams per liter). In order to convert a value from milligrams per cubic millimeter to grams per liter (from mg/mm³ to g/L) simply type the number of mg/mm³ to be converted to g/L and then click on the 'convert' button.