Convert gallons (US) to fluid ounces instantly using our free online calculator.
Calculator
How to Use This Converter
Enter a value in gallons (US) and the result will automatically convert to fluid ounces. You can also enter a value in fluid ounces to convert back to gallons (US).
Formula
1 gallons (US) = 128 fluid ounces
1 fluid ounces = 0.0078125 gallons (US)