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