How Big Is Pluto and How Big Is the Planet Pluto Compared To Earth and Mercury?

Pluto is the smallest planet in the solar system.

The dwarf planet has a diameter of 1,425 miles (2,280 km), which is less than half the width of the United States.

It is about 50 percent of the size of Mercury, and 66 percent the size of Earth’s moon.

Pluto’s moon, Charon, has a diameter of about 739 miles (1,182 km).

Originally classified as a planet, Pluto is now considered the largest member of a distinct population known as the Kuiper belt.

A few scientists and astronomers continue to believe that the dwarf planet Pluto should be classified as a planet.