How to Convert Gallons (US) to Fluid Ounces (US)
To convert gallons (us) to fluid ounces (us), multiply the value by 128.
The Formula
Fluid Ounces (US) = Gallons (US) × 128
Key Fact
1 gallon (us) = 128 fluid ounces (us)
Tip: To convert fluid ounces (us) back to gallons (us), divide by 128.