# Choosing US Customary Measurement Units

United States customary units are a system of measurements used in the United States. The United States customary system developed from English units that were in use before America got its independence.

• Americans use customary units in business, personal and social activities.

• In science, medicine, industry and government sectors, however, metric units are used.

• The International System of Units (SI), the latest form of the metric system, is recommended for use by the U.S. National Institute of Standards and Technology.

• For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, Measurement in inches is common for shorter objects or lengths.

• Typically, people use yards, miles, and sometimes feet to describe long distances.

• People use customary units like ounces, pounds, tons to measure weights.

• People use customary units like cups, pints, quarts and gallons and so on to measure capacity or volumes.

• You need to convert from one unit of measure to another if you are solving problems that include measurements involving more than one type of measurement.

• Each of the units can be converted to one of the other units using the table of equivalents, the conversion factors, and/or the factor label method shown in this topic.

• Which choice best represents the length of a toothpick?

Which customary unit best represents the length of a toothpick?

### Solution

There several customary units of length like inches, feet, yards etc. The best customary unit that represents the length of a toothpick is inch.

Which customary unit best represents the capacity of a water tank?

### Solution

There several customary units of capacity like cups, pints, quarts and gallons etc. The best customary unit that represents the capacity of a water tank is gallon.

Which customary unit best represents the weight of an elephant?

### Solution

There several customary units of weight like ounces, pounds, tons etc. The best customary unit that represents the weight of an elephant is ton.