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