Light-Year Converter
Convert Astronomical Distances
Convert between light-years, parsecs, astronomical units, and other distance measurements used in astronomy.
Distance Converter
Quick Facts
1 light-year ≈ 9.461 × 10¹⁵ m
1 parsec ≈ 3.26 light-years
1 AU ≈ 150 million km
Note
A light-year is the distance light travels in one year at 299,792,458 m/s.
Example Distances
Sun to Earth
1 AU ≈ 8.3 light-minutes
Nearest Star (Proxima)
4.24 light-years
Milky Way Diameter
~100,000 light-years
About Light-Years
A light-year is a unit of astronomical distance representing the distance light travels in one year in a vacuum.
- 1 light-year ≈ 9.461 trillion km
- Speed of light: 299,792,458 m/s
- Used for interstellar distances
Astronomical Units
Parsec
Distance at which 1 AU subtends 1 arcsecond
Astronomical Unit
Mean Earth-Sun distance
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