Unidade Astronômica (UA)

The Astronomical Unit (AU) calculator converts values in AU to kilometers and light-years. An Astronomical Unit is a distance measure based on the average distance between Earth and the Sun, approximately 93 million miles or 149.6 million kilometers. This tool is useful for astronomers, students, and space enthusiasts who need to compare distances within the Solar System or beyond.

It works simply: you enter a value in AU and the calculator applies the relation 1 AU = 149,600,000 km to obtain kilometers. For light-years, it uses the equivalence 1 light-year ≈ 63,241 AU. Results are displayed instantly, making astronomical scales easier to understand.

Use this calculator when studying planetary orbits, distances between celestial bodies, or space missions. For instance, Jupiter's distance from the Sun is about 5.2 AU, equivalent to roughly 778 million km. The conversion to light-years is useful for comparing interstellar distances, such as Proxima Centauri (4.246 light-years).

Caution: the exact definition of AU was updated in 2012 to 149,597,870,700 meters. This calculator uses the approximate value of 149.6 million km, sufficient for educational purposes. For scientific precision, use the official value. Note that light-years are used for much larger distances, and the reverse conversion (light-years to AU) is not provided here.