How many inches are in 1 foot?

One foot is defined as a unit of measurement that is exactly 12 inches long. This measurement is standardized and widely used in the United States customary and imperial systems of measurement. Understanding that a foot is made up of 12 inches is fundamental in both practical applications, such as measuring height or length, and in mathematical conversions where one might need to switch between feet and inches for calculations.

In this case, choosing the option that states 12 inches correctly aligns with the established measurement, making it the accurate answer.