How to convert light years to astronomical units
1 light year is equal to 63,241.07708 astronomical units, and 1 astronomical unit is equal to 0.00001581250741 light years. To convert, multiply by the conversion factor:
astronomical units = light years × 63,241.07708
astronomical units = light years ÷ 0.00001581250741Example: convert 15 ly to au: 15 × 63,241.07708 = 948,616.1563 au.
Light Year to Astronomical Unit conversion table
| Light Year (ly) | Astronomical Unit (au) |
|---|---|
| 0.01 ly | 632.4107708 au |
| 0.1 ly | 6,324.107708 au |
| 1 ly | 63,241.07708 au |
| 2 ly | 126,482.1542 au |
| 3 ly | 189,723.2313 au |
| 5 ly | 316,205.3854 au |
| 10 ly | 632,410.7708 au |
| 20 ly | 1,264,821.542 au |
| 50 ly | 3,162,053.854 au |
| 100 ly | 6,324,107.708 au |
| 250 ly | 15,810,269.27 au |
| 500 ly | 31,620,538.54 au |
| 1,000 ly | 63,241,077.08 au |
About the light year
A light-year is the distance light travels in a vacuum in one Julian year (365.25 days): about 9.46 trillion km. The nearest star system, Alpha Centauri, is about 4.37 light-years away.
Symbol: ly · 1 ly = 9.460730473 × 10¹⁵ m · Category: Astronomical
About the astronomical unit
The astronomical unit is exactly 149,597,870,700 m, roughly the average distance from Earth to the Sun. It's used for distances within the solar system.
Symbol: au · 1 au = 149,597,870,700 m · Category: Astronomical