Mercury is not measured in light years from the sun. Light years are used to measure extremely vast distances between stars and galaxies, not within our solar system.

Mercury's average distance from the sun is 0.39 Astronomical Units (AU). One AU is the average distance between the Earth and the Sun, which is about 93 million miles (150 million kilometers).

Therefore, Mercury is about 36 million miles (58 million kilometers) from the sun.