Light Years to Kilometers
Convert ly to km quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.
One light-year is approximately 9.46073 trillion kilometers.
How to use the Light Years to Kilometers
- Enter the number you want to convert.
- Confirm the source unit shown beside the input.
- Choose decimal precision if you need more or less detail.
- Read the converted result.
- Copy the result when you need to use it elsewhere.
How the conversion works
One light-year is approximately 9.46073 trillion kilometers.
For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.
Common ly to km conversions
| ly | km |
|---|---|
| 1 ly | 9.46073e+12 km |
| 2 ly | 1.89215e+13 km |
| 5 ly | 4.73037e+13 km |
| 10 ly | 9.46073e+13 km |
| 20 ly | 1.89215e+14 km |
| 50 ly | 4.73037e+14 km |
Example
For example, entering 1 ly gives approximately 9.46073e+12 km using the rule above. Change the input to test your own value.
Frequently asked questions
Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.
Page reviewed: August 24, 2026.