An inch is a small unit of measurement used in the United States and a few other countries. The plural form of inch is inches, and it can be abbreviated as "in." One inch equals 2.54 centimeters, which is a metric system measurement.
A foot is also used in the United States. The plural form is listed as feet, and it is abbreviated as "ft." The name is derived from it historically being based on the length of a foot.Learn more about Measurements