Conversion from Light year (ly) to Parsec (pc) and vice versa

Updated on by Stefan Banse

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

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Info about "Light year"

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.

Info about "Parsec"

The parsec is an astronomical unit of length and is equivalent to around 3.26 light-years. It is a very powerful tool used to determine the distance between stars because the angles between the stars are very important.

A star seems to move a little bit back and forth during the year viewed from Earth. This is because the earth moves around the sun in an interval of 6 months, once relatively to the "left" and "right" sides of the sun. The final phases of this star's movements form an angle seen from the earth. This angle becomes smaller and smaller as the star moves further away.

The average distance between the earth and the sun is known, so trigonometric results show that an imaginary celestial object, that moves back and forth by a 3600th degree, around 3.26 light-years away from the earth. This distance is defined as a parsec. The back and forth movement are called a parallax movement. A 3600th of a degree is called an arc second. The term parsec is derived from these two terms.

This definition makes it very easy to describe astronomical distances, as they are directly derived from the reciprocal of the parallax angle. For example, if the angle is one arc second, the distance is 1pc, if the angle is 0.5 arc seconds, the distance is 2pc.

Basis for conversion Light year (ly) to Parsec (pc)

The abbreviation for the "Unit of length Light year" is ly. The abbreviation for the "Unit of length Parsec" is pc.

Formula for the conversion of Light year (ly) to Parsec (pc)

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

 Conversion formula Light year to Parsec 

Determine the number of Parsec from Light year

Light year × 0.30659916623719


Formula for the conversion of Parsec (pc) to Light year (ly)

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

 Conversion formula Parsec to Light year 

Determine the number of Light year from Parsec

Parsec × 3.2615874735497


Overview table: How many Light year are how many Parsec?

Light year lyParsec pc
0.01 ly => 0.00306 pc
0.02 ly => 0.00613 pc
0.03 ly => 0.00919 pc
0.04 ly => 0.01226 pc
0.05 ly => 0.01533 pc
0.06 ly => 0.01839 pc
0.07 ly => 0.02146 pc
0.08 ly => 0.02452 pc
0.09 ly => 0.02759 pc
0.10 ly => 0.03066 pc
0.20 ly => 0.06132 pc
0.30 ly => 0.09198 pc
0.40 ly => 0.12264 pc
0.50 ly => 0.15330 pc
0.60 ly => 0.18395 pc
0.70 ly => 0.21461 pc
0.80 ly => 0.24527 pc
0.90 ly => 0.27593 pc
1 ly => 0.30659 pc
2 ly => 0.61319 pc
3 ly => 0.91979 pc
4 ly => 1.22639 pc
5 ly => 1.53299 pc
6 ly => 1.83959 pc
7 ly => 2.14619 pc
8 ly => 2.45279 pc
9 ly => 2.75939 pc
10 ly => 3.06599 pc
20 ly => 6.13198 pc
30 ly => 9.19797 pc
40 ly => 12.26396 pc
50 ly => 15.32995 pc
60 ly => 18.39595 pc
70 ly => 21.46194 pc
80 ly => 24.52793 pc
90 ly => 27.59392 pc
100 ly => 30.65991 pc
200 ly => 61.31983 pc
300 ly => 91.97975 pc
400 ly => 122.63966 pc
500 ly => 153.29958 pc
600 ly => 183.95950 pc
700 ly => 214.61941 pc
800 ly => 245.27933 pc
900 ly => 275.93925 pc
1 000 ly => 306.59916 pc

Overview table: How many Parsec are how many Light year?

Parsec pcLight year ly
0.01 pc => 0.032615874735497 ly
0.02 pc => 0.065231749470994 ly
0.03 pc => 0.097847624206491 ly
0.04 pc => 0.130463498941988 ly
0.05 pc => 0.163079373677485 ly
0.06 pc => 0.195695248412982 ly
0.07 pc => 0.228311123148479 ly
0.08 pc => 0.260926997883977 ly
0.09 pc => 0.293542872619474 ly
0.10 pc => 0.326158747354971 ly
0.20 pc => 0.652317494709942 ly
0.30 pc => 0.978476242064913 ly
0.40 pc => 1.304634989419885 ly
0.50 pc => 1.630793736774856 ly
0.60 pc => 1.956952484129827 ly
0.70 pc => 2.283111231484798 ly
0.80 pc => 2.609269978839770 ly
0.90 pc => 2.935428726194741 ly
1 pc => 3.261587473549712 ly
2 pc => 6.523174947099424 ly
3 pc => 9.784762420649137 ly
4 pc => 13.046349894198849 ly
5 pc => 16.307937367748561 ly
6 pc => 19.569524841298275 ly
7 pc => 22.831112314847985 ly
8 pc => 26.092699788397698 ly
9 pc => 29.354287261947412 ly
10 pc => 32.615874735497122 ly
20 pc => 65.231749470994245 ly
30 pc => 97.847624206491374 ly
40 pc => 130.463498941988490 ly
50 pc => 163.079373677485620 ly
60 pc => 195.695248412982749 ly
70 pc => 228.311123148479850 ly
80 pc => 260.926997883976980 ly
90 pc => 293.542872619474110 ly
100 pc => 326.158747354971239 ly
200 pc => 652.317494709942479 ly
300 pc => 978.476242064913662 ly
400 pc => 1 304.634989419884959 ly
500 pc => 1 630.793736774856142 ly
600 pc => 1 956.952484129827325 ly
700 pc => 2 283.111231484798736 ly
800 pc => 2 609.269978839769919 ly
900 pc => 2 935.428726194741102 ly
1 000 pc => 3 261.587473549712285 ly

Source information

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

Last update on November 22, 2020

The last changes in the "Units of length" category were implemented by Stefan Banse on November 22, 2020. The main changes were:

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