Length converter: inch → kilometer
Facts about the Inch
The inch (in) is a unit of length in the imperial and U.S. customary systems. It was historically based on the width of a human thumb, and standardized to exactly 25.4 millimeters in 1959. Inches are widely used in the United States for measuring screen sizes, furniture, tools, and construction materials.
Facts about the Kilometer
The kilometer (km) is a metric unit of length equal to 1,000 meters. It is most commonly used to measure long distances, especially in transportation and geography. Road signs, GPS systems, and athletic events like marathons often use kilometers. The term comes from the Greek words 'khilioi' (thousand) and 'metron' (measure).