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