20kilometer

20kilometer is the distance of twenty kilometers. In metric terms, this equals 20,000 meters and, in commonly used imperial units, about 12.427 miles or roughly 10.795 nautical miles. The term is tied to the kilometer, the standard unit of length in the International System of Units (SI). The prefix kilo- denotes a thousand, so a kilometer is 1,000 meters. The 20-kilometer distance is widely used to express road distances, travel routes, and geographic extents.

The kilometer is the preferred unit for measuring longer distances in most countries and contexts, with the symbol km. It is defined as 1,000 meters, and meters are defined in turn by fundamental physical constants. Because kilometers are practical for human-scale distances, they appear in maps, transportation planning, surveying, and geolocation.

Common uses for a 20-kilometer measure include describing a radius or a segment of a road network, planning service areas, and estimating travel times at typical speeds. In geography and logistics, a 20 km range is a convenient scale for planning distribution, emergency response coverage, or hiking and cycling routes.

In sports, 20-kilometer distances appear in endurance events such as the 20 km road race and the 20 km race walk. These events are standard disciplines in athletics competitions and provide a benchmark distance for training and testing aerobic capacity. The 20 km mark is also a common milestone in training programs for longer events, including marathons.