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Astronomical Unit to Light Year Converter

1 au = 63240.873388 ly · exact factor

Fromau
=
Toly
31.6251
formulaly = au × 0.00001581255834134895

Quick conversions

Common conversions

auly
1 au0.0000 ly
5 au0.0001 ly
10 au0.0002 ly
20 au0.0003 ly
50 au0.0008 ly
100 au0.0016 ly

About this conversion

The astronomical unit (au) is a unit of length in the astronomical, commonly used for distances between planets and orbital radius of planets. The light-year (ly) belongs to the astronomical and is typically found in measurements related to distances to nearby stars and sizes of galaxies. By definition, one astronomical unit is approximately 149,597,870.7 km — the mean distance from Earth to the Sun. One light-year is the distance light travels in one Julian year in a vacuum, approximately 9.461 × 10¹⁵ meters. The conversion factor between these two units is 0.00001581255834134895: multiplying any value in au by this number gives the equivalent in ly. For example, 10 au equals 0.0002 ly. Going the other direction, 1 ly equals 63240.873388 au.

Examples

  • 2000000 au to ly = 31.6251 ly
  • 2000000 au in ly is 31.6251 ly
  • 2000000 au equals 31.6251 ly
  • Convert 2000000 au to ly: 31.6251 ly
  • How much is 2000000 au in ly? 31.6251 ly
  • What is 2000000 au in ly? 31.6251 ly
  • 2000000 au converted to ly is 31.6251 ly
  • 31.6251 ly is equal to 2000000 au

Frequently asked questions

1 astronomical unit is equal to exactly 0.00001581255834134895 light-year (and conversely, 1 light-year = 63240.873388 astronomical unit). This factor is fixed by international definition and does not vary.