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Pluto is not a planet so that would be Mercury is 13.72% smaller. Venus is 0.23% smaller. Mars is 9.42% smaller. So that means 3 planets are smaller than Earth. 48 people found this useful.
Mercury is the smallest planet in the Solar System. Its radius is a mere 2,439.7 km. It is so small that the moons of other planets such as Ganymede and Titan are larger than Mercury. Despite being the smallest planet in the Solar System, Mercury is denser than any of the larger gas giants such as Neptune, Uranus, Jupiter or Saturn.