Convert Light Year to Astronomical Unit
Type the number of light years that you wish to convert to astronomical units.
How to Convert Light Years to Astronomical Units
The light year and astronomical unit are both units of length. 1 light year equals 63241.97861 astronomical units. This means to convert light years to astronomical units, you multiply by 63241.97861.
Formula
Step-by-Step Example
Convert 5 ly to astronomical units:
We need to convert light years to astronomical units
Since 1 ly = 63241.97861 AU, multiply by 63241.97861
5 × 63241.97861 = 316209.89305
5 ly = 316209.89305 AU
Light Year to Astronomical Unit Conversion Table
Quick reference table for common light year to astronomical unit conversions. Click any value for detailed calculation.
| Light Years (ly) | Astronomical Units (AU) |
|---|---|
| 0.1 ly | 6324.197861 AU |
| 0.5 ly | 31620.989305 AU |
| 1 ly | 63241.97861 AU |
| 2 ly | 126483.95722 AU |
| 5 ly | 316209.89305 AU |
| 10 ly | 632419.7861 AU |
| 25 ly | 1581049.4652 AU |
| 50 ly | 3162098.9305 AU |
| 100 ly | 6324197.861 AU |
About These Units
Light Year (ly)
A light year (ly) is the distance light travels in one year: approximately 9.461 trillion kilometers or 5.879 trillion miles. Light years measure interstellar distances. The nearest star Proxima Centauri is 4.24 light years away. Light travels 299,792 km/second.
Astronomical Unit (AU)
An astronomical unit (AU) is the average distance from Earth to the Sun: approximately 149.6 million kilometers or 93 million miles. AUs measure distances within our solar system. Mars is 1.52 AU from the Sun, Jupiter is 5.2 AU.
Frequently Asked Questions
How do I convert light years to astronomical units?
To convert light years to astronomical units, multiply the value by 63241.97861. For example, 10 ly = 632419.7861 AU.
How many astronomical units are in 1 light year?
1 light year equals 63241.97861 astronomical units.
What is the formula for light years to astronomical units?
The formula is: AU = ly × 63241.97861.