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