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