Since the average glass size is eight fluid ounces and there are 128 fluid ounces per gallon, all we have to do is divide the two numbers: 128/8 = 16 You need 16 glasses of milk to equal one gallon.

how many onces in a gallon of water There are 128 fluid onces in a gallon of water. 8oz in a cup X 2 cups in a pint x 2 pints in a quart x 4 quarts in a gallon