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