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