Light-years to parsecs
Type a value in light-years to see it in parsecs straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the light-years box.
- Read the result in parsecs as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
pc = ly × 0.3066013938
Multiply the value in light-years by 0.3066013938 to get parsecs.
Example
To convert 25 ly to parsecs: 25 × 0.3066013938 = 7.66503 pc.
Conversion table
| Light-years (ly) | Parsecs (pc) |
|---|---|
| 1 | 0.306601 |
| 2 | 0.613203 |
| 3 | 0.919804 |
| 5 | 1.53301 |
| 10 | 3.06601 |
| 20 | 6.13203 |
| 25 | 7.66503 |
| 50 | 15.3301 |
| 100 | 30.6601 |
| 250 | 76.6503 |
| 500 | 153.301 |
| 1,000 | 306.601 |
About the units
- Light-year
- A light-year is the distance light travels in one Julian year of 365.25 days, exactly 9460730472580800 meters.
- Parsec
- A parsec is exactly 648000/π astronomical units by IAU definition, about 3.26 light-years.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many parsecs are in one light-year?
1 ly = 0.306601 pc exactly.
How do I convert light-years to parsecs?
Use pc = ly × 0.3066013938. For example, 25 ly = 7.66503 pc.
How many light-years are in one parsec?
1 pc = 3.26156 ly.
Are the inch, foot and mile factors exact or rounded?
They are exact by definition. Since the 1959 agreement one inch is exactly 2.54 cm, one foot 0.3048 m and one mile 1609.344 m.
What is the difference between a mile and a nautical mile?
A statute mile is 1609.344 meters and is used on roads. A nautical mile is 1852 meters and is used at sea and in aviation.