Astronomical Distance Converter
Convert between kilometers, astronomical units, light-years, and parsecs instantly.
Type in any field and the others update automatically.
Type in any field — the others update instantly.
All astronomical distance conversions use kilometers (km) as the base unit.
Key conversions:
- 1 AU (Astronomical Unit) = 149,597,870.7 km (Earth-to-Sun distance)
- 1 light-year = 9,460,730,472,580.8 km (distance light travels in one year)
- 1 parsec = 30,856,775,814,913.7 km (about 3.2616 light-years)
Common references:
- Earth to Moon: about 384,400 km (0.00257 AU)
- Earth to Sun: 1 AU
- Nearest star (Proxima Centauri): 4.24 light-years (1.30 parsecs)
- Center of Milky Way: about 26,000 light-years