Kilometer to Decimeter Converter

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.

A decimeter (dm) is a unit of length in the metric system equal to one-tenth of a meter (0.1 m). It provides a convenient intermediate measurement between centimeters and meters.

The decimeter was established as part of the original metric system in 1795. The prefix 'deci-' comes from the Latin word 'decimus' meaning 'tenth'. While part of the original system, it has seen limited adoption in most practical applications.

Decimeters are occasionally used in some European countries for certain measurements, particularly in education to help students understand metric relationships. They may appear in some technical drawings or scientific contexts, but centimeters and meters are generally preferred.