How many ounces are in a gallon?

A gallon is a standard unit of measurement for liquid volume, commonly used in the United States. One gallon is equivalent to 128 fluid ounces. This conversion is crucial for various applications, including herbicide mixing, where precise measurements ensure proper dosage and effectiveness. Understanding that there are 128 ounces in a gallon allows one to accurately calculate how much of a herbicide or other liquid to use based on the size of the spray area or the recommended application rates. The other answers reflect incorrect conversions and could lead to significant errors in application rates if used.