Question: how many ounces in 1 gallon of milk?
Answer: There are 128 fluid ounces in a gallon. To convert gallons to fluid ounces, multiply the gallon value by 128. For example, to find out how many fluid ounces there are in a gallon and a half, multiply 1.5 by 128, that makes 192 fluid ounces in a gallon and a half.