To convert parsecs to light years, multiply by 3.261563777.
The calculation uses 1 pc = 3.261563777 ly. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in ly = value in pc × 3.261563777
pc- Input unit: parsecs
ly- Output unit: light years
How to use this calculator
- Enter a value in pc.
- Multiply by the stored conversion factor.
- Read the result in ly; divide by the same factor to convert back.
Worked examples
Worked conversion
1 pc × 3.261563777 ≈ 3.261563777 ly.
Reverse conversion
3.261563777 ly ÷ 3.261563777 ≈ 1 pc. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 3.261563777 ly per pc.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
pc to ly table
| pc | ly (rounded) |
|---|---|
| 0 | 0 |
| 1 | 3.261563777 |
| 2 | 6.523127554 |
| 5 | 16.30781889 |
| 10 | 32.61563777 |
| 100 | 326.1563777 |
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