# Convert Light year to...

Light year | |
---|---|

Unit system | astronomical |

Unit of | length |

Unit conversions | |

1 light year in ... |
... is equal to ... |

SI unit(s) | 9.4607×10^{15} m |

Imperial/US unit(s) | 5.8786×10^{12} mi |

Astronomical unit(s) | 0.3066 pc |

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

Metric | Conversion |
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Kilometre [km] | |

Hectometre [hm] | |

Decametre [dam] | |

Metre [m] | |

Decimetre [dm] | |

Centimetre [cm] | |

Millimetre [mm] | |

Micrometre [µm] | |

Nanometre [nm] | |

Angstrom [Å] |

British/Imperial | Conversion |
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League | |

Mile [mi] | |

Furlong | |

Chain | |

Rod [rd] | |

Yard [yd] | |

Foot [ft] | |

Link | |

Hand | |

Inch [in] | |

Line | |

Mil [mil] | |

Thou [thou] |

Nautical | Conversion |
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Sea mile | |

Fathom |

Astronomical | Conversion |
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Parsec [pc] | |

Light Year | |

Astronomical Unit [AE] | |

Light Minute | |

Light Second |

A **light-year** is a unit of length used to express astronomical distances. It is about 9 trillion kilometres or 6 trillion miles.

As defined by the International Astronomical Union (IAU), a **light-year** is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time.

The **light-year** is most often used when expressing distances to stars and other distances on a galactic scale, especially in nonspecialist and popular science publications. The unit usually used in professional astrometry is the parsec.

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