Kilometers to Light Years Converter
Convert any distance between kilometers and light years in both directions, with full scientific notation and plain number output.
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Result
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Kilometers
Light Years
Reference:
1 light year = 9,460,730,472,580.8 km
Quick Reference Table
| Light Years (ly) | Kilometers (km) | Example |
|---|---|---|
| 0.000016 | 150,000,000 | Earth to Sun (approx.) |
| 0.0063 | 59,657,519,000 | Inner edge of Oort Cloud |
| 1 | 9,460,730,472,580.8 | One light year |
| 4.24 | 40,113,496,603,262 | Proxima Centauri |
| 8.6 | 81,362,282,063,994 | Sirius (brightest star) |
| 26,000 | 2.46 × 1017 | Center of Milky Way |
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Summary
Convert any distance between kilometers and light years in both directions, with full scientific notation and plain number output.
How it works
- Enter a distance value in the kilometers field to convert to light years.
- Or enter a value in the light years field to convert back to kilometers.
- Results appear instantly in both plain and scientific notation.
- Use the Swap button to quickly reverse the conversion direction.
- Click Copy next to any result to copy the value to your clipboard.
Use cases
- Understand how far away stars and galaxies are in everyday units.
- Convert astronomical distances for science homework or research.
- Check spacecraft travel estimates in relatable km vs. cosmic ly scale.
- Compare interstellar distances described in light years to kilometers.
- Educational demonstrations of the immense scale of the universe.
- Verify figures cited in astronomy articles or textbooks.
Frequently Asked Questions
Last updated: 2026-06-10 ·
Reviewed by Nham Vu