Astronomical Distance Converter
Convert between cosmic distance units
Quick Conversions
Kilometer to Astronomical Unit
Kilometer to Light-Year
Kilometer to Parsec
Kilometer to Lunar Distance
Astronomical Unit to Kilometer
Astronomical Unit to Light-Year
Astronomical Unit to Parsec
Astronomical Unit to Lunar Distance
Light-Year to Kilometer
Light-Year to Astronomical Unit
Light-Year to Parsec
Light-Year to Lunar Distance
Parsec to Kilometer
Parsec to Astronomical Unit
Parsec to Light-Year
Parsec to Lunar Distance
Lunar Distance to Kilometer
Lunar Distance to Astronomical Unit
Lunar Distance to Light-Year
Lunar Distance to Parsec
About Astronomical Distance Conversion
Astronomical distances are so vast that everyday units become impractical. The astronomical unit (AU) represents the Earth-Sun distance (~150 million km). A light-year is the distance light travels in one year (~9.46 trillion km). A parsec (~3.26 light-years) is based on stellar parallax measurement.
The nearest star (Proxima Centauri) is 4.24 light-years away. Our galaxy is about 100,000 light-years across. These conversions help astronomers and space enthusiasts contextualize cosmic distances.