1 light year = 9.46073e+12 kilometers
Convert light years to kilometers.
Both directions on one page — swap the units and the whole thing runs backwards.
Type a value, or “5cm to in”
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The formula
km = ly × 9.46073e+12
Worked through with a real value: 10 light years = 9.46073e+13 kilometers.
Going the other way: ly = km × 1.05700e-13, so 1 kilometer = 1.05700e-13 light years.
What each unit is
- light year ly
- The distance light travels in a Julian year, about 9.46 trillion kilometres.
- kilometer km
- A thousand metres, and the unit road distances are measured in almost everywhere outside the United States and the United Kingdom.
Where these come from
- 1 light year = 9460730472580800 meters
- 1 kilometer = 1000 meters
Every other number on this page is computed from those, and each category is pinned to conversions worked out by hand from the units' primary definitions before it ships.
Conversion tables
| light years (ly) | kilometers (km) |
|---|---|
| 1 | 9.46073e+12 |
| 2 | 1.89215e+13 |
| 3 | 2.83822e+13 |
| 4 | 3.78429e+13 |
| 5 | 4.73037e+13 |
| 6 | 5.67644e+13 |
| 7 | 6.62251e+13 |
| 8 | 7.56858e+13 |
| 9 | 8.51466e+13 |
| 10 | 9.46073e+13 |
| 20 | 1.89215e+14 |
| 25 | 2.36518e+14 |
| 50 | 4.73037e+14 |
| 75 | 7.09555e+14 |
| 100 | 9.46073e+14 |
| kilometers (km) | light years (ly) |
|---|---|
| 1 | 1.05700e-13 |
| 2 | 2.11400e-13 |
| 3 | 3.17100e-13 |
| 4 | 4.22800e-13 |
| 5 | 5.28500e-13 |
| 6 | 6.34201e-13 |
| 7 | 7.39901e-13 |
| 8 | 8.45601e-13 |
| 9 | 9.51301e-13 |
| 10 | 1.05700e-12 |
| 20 | 2.11400e-12 |
| 25 | 2.64250e-12 |
| 50 | 5.28500e-12 |
| 75 | 7.92751e-12 |
| 100 | 1.05700e-11 |
Questions
How many kilometers are in a light year?
1 light year = 9.46073e+12 kilometers.
How do I convert light years to kilometers?
Use km = ly × 9.46073e+12. For example, 10 light years = 9.46073e+13 kilometers.
How many light years are in one kilometer?
1 kilometer = 1.05700e-13 light years.
What is 10 light years in kilometers?
10 light years = 9.46073e+13 kilometers.
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