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