Length Unit Converter

Formula: 1 m = 100 cm
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Common Conversions
1 meter = 100 centimeters
1 kilometer = 0.62 miles
1 inch = 2.54 centimeters
1 foot = 0.3048 meters
1 mile = 1.60934 kilometers
1 yard = 0.9144 meters
Length Units Guide

The metric system is a decimal-based system of measurement established in France in the 1790s. It's now the standard system used worldwide except in the United States, Liberia, and Myanmar.

  • Millimeter (mm): One thousandth of a meter (0.001m). Used for small precise measurements.
  • Centimeter (cm): One hundredth of a meter (0.01m). Commonly used for everyday measurements.
  • Meter (m): The base unit of length in the International System of Units (SI). Originally defined as one ten-millionth of the distance from the North Pole to the Equator.
  • Kilometer (km): One thousand meters (1000m). Used for measuring distances between geographical locations.

The imperial system originated in the British Empire and is still commonly used in the United States.

  • Inch (in): Historically based on the width of a human thumb. 12 inches make 1 foot.
  • Foot (ft): Originally based on the length of a human foot. 3 feet make 1 yard.
  • Yard (yd): Historically based on the distance from the tip of the nose to the end of the outstretched arm. 1,760 yards make 1 mile.
  • Mile (mi): Derived from the Roman "mille passus" (thousand paces). Each pace was two steps.

  • Nanometer (nm): One billionth of a meter (10^-9 m). Used in nanotechnology and wavelength measurements.
  • Micron (μm): One millionth of a meter (10^-6 m). Used in biology and engineering.
  • Angstrom (Å): 0.1 nanometers (10^-10 m). Used in atomic physics and chemistry.
  • Nautical Mile (nmi): Approximately 1.852 kilometers. Used in marine and air navigation.
  • Furlong (fur): 220 yards or 1/8 of a mile. Traditionally used in horse racing.
  • Light Year (ly): The distance light travels in one year (about 9.46 trillion kilometers). Used in astronomy.
  • Astronomical Unit (AU): The average distance from Earth to the Sun (about 149.6 million kilometers). Used in astronomy.
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