Astronomical Unit Conversions

Use this easy and mobile-friendly calculator to convert between Astronomical Units and other units of Astronomy.
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1 Astronomical Unit ≈
0.000015812507 Light Years
result rounded
Decimal places
Astronomical Units
An astronomical unit is the average distance between the Earth and the Sun. Estimates of this distance have varied over time. It is now defined as exactly 149,597,870.7 kilometers.
Light Years
A light year is the distance that light travels in one year. The year used by the International Astronomical Union is 365.25 days. A light year is defined as exactly 9,460,730,472,580.8 kilometers.