How many fluid ounces are in 1 gallon?

One gallon is equivalent to 128 fluid ounces. This conversion is based on the standard measurements used in the United States, where one gallon is defined as exactly 128 fluid ounces.

To understand this further, it's helpful to know that the gallon is a larger unit of liquid measurement that is often used for beverages and other liquids. When measuring smaller quantities of liquids, such as in cups or fluid ounces, understanding the relationship between these different units is crucial for tasks like cooking, mixing drinks, or performing any activities that require precise measurements.

Other answers propose amounts that do not correspond to a gallon's capacity in fluid ounces. For instance, 100, 64, and 80 fluid ounces represent smaller quantities that fall significantly short of the gallon measurement. Thus, the correct answer of 128 fluid ounces accurately reflects the total volume contained in one gallon.