Convert Gallon to Fluid Ounce

One gal equals 128 fl oz. This converter allows you to easily convert between Gallon and Fluid Ounce in real time.

Formula

gal × 128 = fl oz

Example: 1 gal = 128 fl oz

What is Gallon?

The gallon is a unit of volume in the US customary system, defined as exactly 3.785411784 liters. In the United States, gasoline is sold by the gallon, and prices at gas stations are displayed per gallon. Milk, paint, and other household liquids are also commonly sold in gallon containers. Note that the imperial gallon used in the United Kingdom is a different, larger unit equal to approximately 4.546 liters. All conversions on this page use the US gallon.

What is Fluid Ounce?

The fluid ounce is a unit of volume in the US customary system, defined as exactly 29.5735295625 milliliters. It should not be confused with the ounce of mass. In the United States, beverage containers are labeled in fluid ounces—a standard soda can holds 12 fl oz (about 355 mL). Coffee shop sizes (8 oz, 12 oz, 16 oz) also refer to fluid ounces. Cosmetics and perfumes often list their volume in fluid ounces on the packaging.