Length Unit Converter
Easily convert lengths between metric, imperial, nautical, astronomical, and ancient systems.
Result
0.001 Kilometre (km)
Frequently Asked Questions
What is length unit conversion?
Length unit conversion is the process of changing a measurement of length from one unit (e.g., meters) to another (e.g., feet) while representing the same physical distance.
Why are there different systems of measurement for length?
Different systems (like metric, imperial, nautical) arose historically in various cultures for trade, land measurement, and science, leading to diverse units and standards.
What's the difference between the metric and imperial systems?
The metric system is a decimal system based on the meter (e.g., kilometers, centimeters), widely used globally. The imperial system uses units like feet, inches, and miles, with less regular subdivisions, historically common in the UK and its former colonies.
What is a nautical mile and why is it used?
A nautical mile is based on the Earth's circumference (one minute of latitude). It's primarily used in air and sea navigation because it directly relates to geographical coordinates.
What is a light-year a measure of?
A light-year is a unit of astronomical distance, representing the distance light travels in a vacuum in one Earth year. It's used for measuring vast interstellar and intergalactic distances.
Which system of measurement is most widely used globally?
The metric system, officially the International System of Units (SI), is the most widely used system of measurement globally, adopted by almost all countries for scientific, commercial, and general purposes.