Length Converter
Measure distance from one point to another.
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Unit Information
Meter (m)
Definition: The SI base unit of length, defined by the speed of light in vacuum.
History: Originally defined as one ten-millionth of the distance from the equator to the North Pole.
Current Use: Widely used worldwide for scientific, engineering, and everyday measurements.
Millimetre (mm)
Definition: A unit of length equal to one thousandth of a meter.
History: As a derived unit of the meter, its history is tied to the establishment of the metric system during the French Revolution.
Current Use: Commonly used in engineering, manufacturing, and other precise measurements, especially in metric-system countries.
Centimetre (cm)
Definition: A unit of length equal to one hundredth of a meter.
History: Part of the original metric system, established during the French Revolution.
Current Use: Commonly used for everyday measurements, especially in countries using the metric system, and in scientific contexts.
Kilometre (km)
Definition: A unit of length equal to one thousand meters.
History: Introduced with the metric system in France in the late 18th century.
Current Use: Widely used for measuring geographical distances, road distances, and in many scientific and engineering applications globally.
Nanometre (nm)
Definition: A unit of length equal to one billionth of a meter.
History: Became significant with nanotechnology advancement in the late 20th century.
Current Use: Used in nanotechnology, chemistry, and physics for measuring very small dimensions.
Inch (in)
Definition: An imperial unit equal to 2.54 centimeters, still widely used in the United States.
History: Originally defined as the width of a man's thumb.
Current Use: Used in the United States and some other countries for everyday measurements.
Foot (ft)
Definition: A unit of length equal to 12 inches or 0.3048 meters.
History: Derived from the length of a human foot, standardized over time.
Current Use: Used in the United States for height and short distances.
Yard (yd)
Definition: A unit of length equal to 3 feet or 0.9144 meters.
History: Evolved from the distance from the nose to the tip of an outstretched finger.
Current Use: Used in the United States for textiles and sports.
Mile (mi)
Definition: A unit of length equal to 5280 feet or 1.609 kilometers, used for long distances.
History: Derived from the Roman mile "mille passus" (thousand paces).
Current Use: Used in the United States and United Kingdom for long distances.
Furlong (fur)
Definition: A unit of length equal to 220 yards or 1/8 of a mile.
History: Originally the length of a furrow in one acre of a plowed field.
Current Use: Still used in horse racing and some land measurements.
All Unit Conversions
Did you know?
- The meter was originally defined as 1/10,000,000 of the distance from the Earth's equator to the North Pole.
- A light-year is a unit of length, not time. It is the distance light travels in one year.
- A nautical mile equals one minute of arc of latitude on Earth.
Related Categories
Common Conversions
Convert Meters to Feet
m * 3.281
Convert Inches to Centimeters
in * 2.54