Astronomical units to light-years Converter

This page allows you to convert length values expressed in astronomical units to their equivalent in light-years.

Enter the value in astronomical units in the top field (the one marked "au"), then press the "Convert" button or the "Enter" key. The converter also works the other way round: if you enter the value in light-years in the "ly" field, the equivalent value in astronomical units is calculated and displayed in the top field.

Astronomical unit

Astronomical units are used to measure the huge distances in space. One astronomical unit is approximately 149 597 870 691 meters.

Light-year

The light-year is the distance light travels in vacuum in one year. It's equivalent to approximately 9,460,730,472,580.8 km.