Meter to Kilometer Converter

A meter (m) is the base unit of length in the International System of Units (SI). Originally defined as one ten-millionth of the distance from the Earth's equator to the North Pole, it is now defined by the speed of light in vacuum.

The meter was first defined in 1793 during the French Revolution as part of the metric system. Initially based on Earth's dimensions, it was later redefined using a platinum-iridium bar (1889), then by wavelengths of light (1960), and finally in 1983 by the distance light travels in vacuum in 1/299,792,458 of a second.

The meter is universally used in science, engineering, and most countries for everyday measurements. It's the standard for construction, manufacturing, sports (track and field), and scientific research. Most countries use meters for height, room dimensions, and short to medium distances.

A kilometer (km) is a unit of length in the metric system equal to 1,000 meters. It is one of the most commonly used units for measuring medium to long distances on Earth.

The kilometer was first introduced in 1795 during the French Revolution as part of the original metric system. The term comes from the Greek word 'khilioi' meaning 'thousand' and the French word 'mètre'. It became widely adopted throughout Europe in the 19th century and is now the standard unit for road distances in most countries worldwide.

Kilometers are extensively used for measuring road distances, city planning, geographical surveys, and athletic events like marathons. Most countries use kilometers for speed limits (km/h) and fuel efficiency measurements. It's the standard unit for mapping and GPS navigation systems globally.