Free Astronomical Unit Converter

Convert between Astronomical Units (AU) and kilometres, miles, and light-minutes.

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AU

Kilometres

149,597,870.7 km

Miles92,955,807.3 mi
Light-Minutes8.3167 light-min

Kilometres vs Distance

View formula & how it works →

The Astronomical Unit

1 AU = 149 597 870.7 km (exact, IAU 2012)

Light takes about 8.317 minutes to travel 1 AU. The AU is the fundamental baseline for solar system distances.

Example Calculation

Jupiter orbits at about 5.2 AU.

  1. 01km = 5.2 × 149 597 870.7 ≈ 778 million km
  2. 02Light-minutes = 5.2 × 8.317 = 43.2
  3. 03Light takes about 43 minutes to reach Jupiter from the Sun.

Frequently Asked Questions

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