Equivalent distance
Your value in light years, parsecs, and astronomical units.
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Astronomical
Light Year Conversion
Convert light years to kilometres, miles, astronomical units, and parsecs instantly, with a full equivalents table and comparison chart.
Result
9.46 trillion km
How it works
A light year is the distance light travels in one year through a vacuum, about 9.46 trillion kilometres. Astronomers also use the parsec, which is a bit larger. All these units scale from the metre.
1 light year ≈ 9.4607 × 10¹² km
1 parsec ≈ 3.2616 light years ≈ 206,265 AU
1 parsec ≈ 3.2616 light years ≈ 206,265 AU
Worked example
Proxima Centauri is about 4.24 light years away, which is roughly 4.24 × 9.46 = 40.1 trillion km.
Frequently asked questions
How far is one light year in km?
About 9.4607 trillion km.
How many light years is a parsec?
About 3.2616 light years.