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