 # Light year (ly) to Astronomical unit (AU)

Units of length ﹣ Converter Light year to Astronomical unit

Here you can convert the Unit of length Light year into the unit Astronomical unit and vice versa you can convert Astronomical unit into Light year. By clicking the "Swap units" icon, you will always obtain the desired conversion in the calculation result, i.e., ly to AU or AU to ly. With the following calculator you can also calculate any other Unit of length.

A light-year refers to the distance of light (in a vacuum) within one year. There are different definitions for a year (Gregorian year, tropical year, Julian year etc.), therefore the Julian year (365.25 days) was used as a definition for the light year. A light-year is converted to 9,460,730,472,580.8 km, around 9.5 trillion km. For example, the Milky Way is 100,000 light-years long because distance is difficult to measure in kilometers.

The astronomical unit (AU) is a unit of length in astronomy. By definition, the AU is 149,597,870,700 meters long, which is almost the average distance between the Earth and Sun.

Apart from the light-year and the parsec, the astronomical unit is one of the most important astronomical units of length. AU has been very important in history because most measurements were performed using AU and not meters. In 2012, the conversion between astronomical units and meters is precisely calculated and AU is no longer an advantage. However, the distance in the Solar System is still often specified in AU because of its more practical values.

## Basis for conversion Light year (ly) to Astronomical unit (AU) and vice versa

The abbreviation for the "Unit of length Light year" is ly. The abbreviation for the "Unit of length Astronomical unit" is AU.

## Formula for the conversion of Light year (ly) to Astronomical unit (AU) and vice versa

The calculation from Light year to Astronomical unit shall be made using the following conversion formula:

Conversion formula Light year to Astronomical unit

Determine the number of Astronomical unit from Light year

Light year × 63241.077084266

## Formula for the conversion of Astronomical unit (AU) to Light year (ly)

The calculation from Astronomical unit to Light year shall be made using the following conversion formula:

Conversion formula Astronomical unit to Light year

Determine the number of Light year from Astronomical unit

Astronomical unit × 1.5812507409821E-5

## Overview table : How many Light year are in a Astronomical unit ?

Light year ly ⇒ Astronomical unit AU
0.01 ly  are  632.41077 AU
0.02 ly  are  1 264.82154 AU
0.03 ly  are  1 897.23231 AU
0.04 ly  are  2 529.64308 AU
0.05 ly  are  3 162.05385 AU
0.06 ly  are  3 794.46462 AU
0.07 ly  are  4 426.87539 AU
0.08 ly  are  5 059.28616 AU
0.09 ly  are  5 691.69693 AU
0.10 ly  are  6 324.10770 AU
0.20 ly  are  12 648.21541 AU
0.30 ly  are  18 972.32312 AU
0.40 ly  are  25 296.43083 AU
0.50 ly  are  31 620.53854 AU
0.60 ly  are  37 944.64625 AU
0.70 ly  are  44 268.75395 AU
0.80 ly  are  50 592.86166 AU
0.90 ly  are  56 916.96937 AU
1 ly  corresponds to  63 241.07708 AU
2 ly  are  126 482.15416 AU
3 ly  are  189 723.23125 AU
4 ly  are  252 964.30833 AU
5 ly  are  316 205.38542 AU
6 ly  are  379 446.46250 AU
7 ly  are  442 687.53959 AU
8 ly  are  505 928.61667 AU
9 ly  are  569 169.69375 AU
10 ly  are  632 410.77084 AU
20 ly  are  1 264 821.54168 AU
30 ly  are  1 897 232.31252 AU
40 ly  are  2 529 643.08337 AU
50 ly  are  3 162 053.85421 AU
60 ly  are  3 794 464.62505 AU
70 ly  are  4 426 875.39589 AU
80 ly  are  5 059 286.16674 AU
90 ly  are  5 691 696.93758 AU
100 ly  are  6 324 107.70842 AU
200 ly  are  12 648 215.41685 AU
300 ly  are  18 972 323.12528 AU
400 ly  are  25 296 430.83370 AU
500 ly  are  31 620 538.54213 AU
600 ly  are  37 944 646.25056 AU
700 ly  are  44 268 753.95898 AU
800 ly  are  50 592 861.66741 AU
900 ly  are  56 916 969.37583 AU
1 000 ly  are  63 241 077.08426 AU

## Overview table : How many Astronomical unit are in a Light year ?

Astronomical unit AU ⇒ Light year ly
0.01 AU  are  0.000000158125074 ly
0.02 AU  are  0.000000316250148 ly
0.03 AU  are  0.000000474375222 ly
0.04 AU  are  0.000000632500296 ly
0.05 AU  are  0.000000790625370 ly
0.06 AU  are  0.000000948750444 ly
0.07 AU  are  0.000001106875518 ly
0.08 AU  are  0.000001265000592 ly
0.09 AU  are  0.000001423125666 ly
0.10 AU  are  0.000001581250741 ly
0.20 AU  are  0.000003162501482 ly
0.30 AU  are  0.000004743752222 ly
0.40 AU  are  0.000006325002963 ly
0.50 AU  are  0.000007906253704 ly
0.60 AU  are  0.000009487504445 ly
0.70 AU  are  0.000011068755186 ly
0.80 AU  are  0.000012650005927 ly
0.90 AU  are  0.000014231256668 ly
1 AU  corresponds to  0.000015812507409 ly
2 AU  are  0.000031625014819 ly
3 AU  are  0.000047437522229 ly
4 AU  are  0.000063250029639 ly
5 AU  are  0.000079062537049 ly
6 AU  are  0.000094875044458 ly
7 AU  are  0.000110687551868 ly
8 AU  are  0.000126500059278 ly
9 AU  are  0.000142312566688 ly
10 AU  are  0.000158125074098 ly
20 AU  are  0.000316250148196 ly
30 AU  are  0.000474375222294 ly
40 AU  are  0.000632500296392 ly
50 AU  are  0.000790625370491 ly
60 AU  are  0.000948750444589 ly
70 AU  are  0.001106875518687 ly
80 AU  are  0.001265000592785 ly
90 AU  are  0.001423125666883 ly
100 AU  are  0.001581250740982 ly
200 AU  are  0.003162501481964 ly
300 AU  are  0.004743752222946 ly
400 AU  are  0.006325002963928 ly
500 AU  are  0.007906253704910 ly
600 AU  are  0.009487504445892 ly
700 AU  are  0.011068755186874 ly
800 AU  are  0.012650005927856 ly
900 AU  are  0.014231256668838 ly
1 000 AU  are  0.015812507409820 ly

## Source information

As source for the information in the 'Units of length' category, we have used in particular:

## Last update on February 19, 2023

The pages of the 'Units of length' category were last editorially reviewed by Stefan Banse on February 19, 2023. They all correspond to the current status.

### Previous changes on October 21, 2021

• November 5, 2020: Publication of the Length converter
• Editorial revision of all texts in this category