The inch is a commonly used length unit in the United States and many other countries. An inch is equal to 0.00039 meters. The inch was originally a Roman unit of length, equal to 1/12 of a foot. It became an SI unit in the early 19th century, and is now one of the six standard lengths interdependent with meters (along with meter, kilometer, millimeter, micro meter, and nano meter). In 1935, theUSEb added the “point” to the name of the inch; thus 0.0003936 meters becomes 3.62 points, or 1/32nd of an inch.

The foot is the basic unit of length in the metric system and is equal to 3.2808 meters. It’s also the primary unit of linear measure in customary systems of measurement, including the English system. The foot is defined as the length of a line from the heel of one person to the toe of another person, with each foot positioned at the same level. Originally, a foot was defined as being equal to 12 inches, but this definition was later changed to its current value.