Convert kilometers (km) to light years (ly) with formulas, examples, and conversion tables.
How to Convert kilometers to light years
To convert kilometers to light years, divide the value by 9.461e12.
The Formula
light years = kilometers ÷ 9.461e12
Key Fact
1 light year = 9.461e12 kilometers
Tip: To convert light years back to kilometers, multiply by 9.461e12.
About Kilometers and Light Years
What is a Kilometer?
The kilometer (km) is a unit of length in the metric system. One kilometer equals 1000 meters.
What is a Light Year?
The light year (ly) is a unit of length in the astronomical system. One light year equals 9461000000000000 meters.