Customary Units and Metric Units

In science classes, and anywhere outside of the United States, length is measured with the Metric System. The most common units that we use to measure length in the metric system are the millimeter, centimeter, meter, and kilometer. The millimeter is the smallest commonly used unit in the metric system.

The customary units to measure length and distances in the customary system are inches, feet, yards, and miles. We can use the given chart for conversion of one customary unit of length to another.

The customary system is the system of measurement primarily used in the United States. Units in this system include the inch, foot, mile, pound, and cup. The metric system is the system of measurement primarily used in science and in countries outside of the United States.