Astronomical Unit (AU) Calculator

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Choose whether you are converting FROM astronomical units or TO astronomical units.
Number of astronomical units to convert. 1 AU is the average Earth-Sun distance.
Astronomical Units
1AU

Distance expressed in astronomical units

Kilometres149,597,870.7km
Miles92,955,807.27mi
Light-years0.00001581ly
Parsecs0.00000485pc
Light-minutes8.3167lmin
Light-seconds499ls
Metres149,597,870,700m
1 AU
  • Mercury
  • Venus
  • Earth
  • Mars
  • Jupiter
  • Saturn
  • Uranus
  • Neptune

1 AU: the Earth-Sun distance, the ruler of the solar system.

  • This is approximately 1 AU, the average Earth-Sun distance, the baseline of astronomical measurement.
  • Light (and radio signals) take about 8.3 minutes to travel this distance.

Next stepUse the reference table below to compare this distance to known solar system objects, or switch the mode to convert back from km, miles, or light-years.

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