# Convert Length or Distance

Length | |
---|---|

Dimension | L |

SI Unit | m |

Imperial/US Unit(s) | yd, ft, in |

Unit conversions | |

1 m in ... |
... is equal to ... |

SI units | 1000 mm 1×10 ^{-3} km |

Imperial/US unit(s) | 1.0936 yd 3.2808 ft 39.370 in |

Nautical units | 5.3996×10^{-4} sea mile |

**I want to convert:**
**using**

Metric | Conversion |
---|---|

Kilometre [km] | |

Hectometre [hm] | |

Decametre [dam] | |

Metre [m] | |

Decimetre [dm] | |

Centimetre [cm] | |

Millimetre [mm] | |

Micrometre [µm] | |

Nanometre [nm] | |

Angstrom [Å] |

British/Imperial | Conversion |
---|---|

League | |

Mile [mi] | |

Furlong | |

Chain | |

Rod [rd] | |

Yard [yd] | |

Foot [ft] | |

Link | |

Hand | |

Inch [in] | |

Line | |

Mil [mil] | |

Thou [thou] |

Nautical | Conversion |
---|---|

Sea mile | |

Fathom |

Astronomical | Conversion |
---|---|

Parsec [pc] | |

Light Year | |

Astronomical Unit [AE] | |

Light Minute | |

Light Second |

In geometric measurements, **length** is the most extended dimension of an object.
In the International System of Quantities, length is any quantity with dimension distance. In other contexts "length" is the measured dimension of an object. For example,
it is possible to cut a length of a wire which is shorter than wire thickness.

Length may be distinguished from height, which is vertical extent, and width or breadth, which are the distance from side to side, measuring across the object at right angles to the length. Length is a measure of one dimension, whereas area is a measure of two dimensions (length squared) and volume is a measure of three dimensions (length cubed). In most systems of measurement, the unit of length is a base unit, from which other units are defined.

In the physical sciences and engineering, when one speaks of **"units of length"**, the word "length" is synonymous with "distance". There are several units that are used to measure length. Historically, units of length may have been derived from the lengths of human body parts, the distance travelled in a number of paces, the distance between landmarks or places on the Earth, or arbitrarily on the length of some fixed object.

In the International System of Units (SI), the basic unit of length is the metre and is now defined in terms of the speed of light. The centimetre and the kilometre, derived from the metre, are also commonly used units. In U.S. customary units, English or Imperial system of units, commonly used units of length are the inch, the foot, the yard, and the mile.

Units used to denote distances in the vastness of space, as in astronomy, are much longer than those typically used on Earth and include the astronomical unit, the light-year, and the parsec.

This article uses material from the Wikipedia article "Length", which is released under the Creative Commons Attribution-Share-Alike License 3.0.