How Many Ounces In A Half Gallon?

8 ounces = 1 cup
16 ounces = 1 pint
32 ounces = 1 quart
64 ounces = 1/2 gallon

I  think  64  ounces

64 US and 80 UK infoandknowledge.com/many-ounces-gallon/

32 ounces