Table Of Contents
Parsec to light year Conversion
1 parsec (pc) is equal to 3.261563777 light year (ly).
1 pc = 3.261563777 ly
or
1 ly = 0.3066013938 pc
Formula
To convert a length from parsec (pc) to light year (ly), multiply the length in parsec by 3.261563777
l(ly) = l(pc) × 3.261563777
Examples:
Convert 20 parsec to light year:
l(ly) = 20pc × 3.261563777 = 65.23127554 ly
Conversion table
| Parsec (pc) | Light year (ly) |
|---|---|
| 1 pc | 3.261563777 ly |
| 2 pc | 6.523127554 ly |
| 3 pc | 9.784691332 ly |
| 5 pc | 16.307818886 ly |
| 10 pc | 32.615637772 ly |
| 20 pc | 65.231275543 ly |
| 25 pc | 81.539094429 ly |
| 50 pc | 163.078188858 ly |
| 100 pc | 326.156377717 ly |
| 250 pc | 815.390944292 ly |
| 500 pc | 1630.781888584 ly |
| 1000 pc | 3261.563777167 ly |
| Light year (ly) | Parsec (pc) |
|---|---|
| 1 ly | 0.306601394 pc |
| 2 ly | 0.613202788 pc |
| 3 ly | 0.919804181 pc |
| 5 ly | 1.533006969 pc |
| 10 ly | 3.066013938 pc |
| 20 ly | 6.132027876 pc |
| 25 ly | 7.665034845 pc |
| 50 ly | 15.330069689 pc |
| 100 ly | 30.660139379 pc |
| 250 ly | 76.650348446 pc |
| 500 ly | 153.300696893 pc |
| 1000 ly | 306.601393786 pc |
Frequently asked questions
How do I convert parsec to light year?
Multiply the value in parsec by 3.261563777 to get the result in light year. For example, 5 pc × 3.261563777 = 16.307818886 ly.
How many light year are in 1 parsec?
1 parsec (pc) is equal to 3.261563777 light year (ly).
How do I convert light year back to parsec?
Use the inverse operation: divide the value in light year by 3.261563777 to get the result in parsec.
How accurate is the parsec to light year conversion?
The converter multiplies by the conversion factor 3.261563777 and rounds the result to 9 decimal places by default. You can increase or reduce the precision with the digits option on this page.
Sources
Conversion factors are based on internationally recognised standards:
