The inch (in) is an imperial unit of length equal to exactly 25.4 millimeters, widely used in the United States, Canada, and the United Kingdom. It is the standard measurement for screen sizes, pipe diameters, and mechanical fasteners, and remains common in everyday use across North America. One inch equals exactly 2.54 centimeters.

The mile (mi) is an imperial distance unit equal to 5,280 feet or approximately 1.6093 kilometers, used primarily in the United States and United Kingdom for road distances. Speed limits on American highways are posted in miles per hour, and runners often use the mile as a benchmark distance. One mile equals roughly 1.609 kilometers.