Gallons (US – Liquid) to Fluid ounces (US) converter

To convert gallons (US – Liquid) to fluid ounces (US), enter the value in the first field. The result in fluid ounces (US) is calculated automatically using the exact conversion factor.

1 US gal = 128 US fl oz
1 US fl oz = 0.0078125 US gal

Formula: US fl oz = US gal × 128
US gal = US fl oz × 0.0078125

Definitions: 1 US gal = 231 in³; 1 US fl oz = 1/128 US gal

The US liquid gallon is the everyday gallon in the United States, used for fuel, milk, paint and most liquids sold by volume. It derives from the old English wine gallon, which was fixed at 231 cubic inches.

The US fluid ounce is 1/128 of a US gallon. It is the volume unit printed on American drink bottles, cans and nutrition labels, and it is not the same thing as the ounce of weight.

See the conversion table with commonly used values, handy for quick reference or study.