Milligrams per milliliter to kilograms per liter conversion calculator above calculates how many kilograms per liter are in 'X' milligrams per milliliter (where 'X' is the number of milligrams per milliliter to convert to kilograms per liter). In order to convert a value from milligrams per milliliter to kilograms per liter (from mg/mL to kg/L) just type the number of mg/mL to be converted to kg/L and then click on the 'convert' button.