What system of measurement is used most often in the US?

The most commonly used system of measurement in the United States is known as the Customary system. This system varies from the Imperial system primarily in usage and application, even though both share some similarities. The Customary system includes units such as inches, feet, pounds, and gallons, which are widely used in everyday activities, construction, and various industries within the U.S.

In contrast, while the Metric system is used internationally and gaining popularity for scientific and industrial purposes, it is not as prevalent in daily life in the U.S. Decimal measurement, while it can refer to the way numbers are presented in certain calculations, does not specifically define a system of measurement like the Customary or Metric systems. Hence, the Customary system is distinct in its pervasive application across multiple fields in American society.