Light-Year to AU Converter
Enter a distance and direction to convert between light-years and astronomical units.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
A light-year is the distance light travels in one Julian year, about 9.4607×10¹² km, while an astronomical unit (AU) is the average Earth-Sun distance, roughly 149.6 million km. The two are related by 1 light-year = 63,241.077 AU.
Astronomers reach for AU when describing distances within the solar system — planets, asteroids, spacecraft trajectories — and switch to light-years (or parsecs) once they're talking about interstellar distances, such as the ~4.25 light-years to Proxima Centauri, our nearest star beyond the Sun. This converter is a quick tool for astronomy students, science communicators, and space enthusiasts moving between these two standard distance scales.
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