Question: is 64 ounces 1/2 gallon?
Answer: Fluid Ounces to Gallons Conversion 1 US fluid ounce is equal to 0.0078125 gallon. To convert fluid oz to gallons, multiply the fluid oz value by 0.0078125 or divide by 128. For example, to convert 64 fluid oz to gallons, divide 64 by 128, that makes 64 fl oz is 0.5 gallon.