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