Formula: US Gallon → US Fluid Ounce
Use this exact relationship: 1 gal = 128 fl oz. UnitNest converts through a standard base unit for the volume category.
Quick example
1 US gallons = 128 US fluid ounces. Change the input above to convert any value; results update instantly in your browser.
Need the other direction? Convert US Fluid Ounce to US Gallon.