A planet's size and mass determines its gravitational force it has on objects and people. Five planets are smaller than Earth and only two are larger.
To understand how each planet's gravitational force differs from Earth's, consider Earth as having a pull of 100%. Mercury and Mars are the two smallest planets, and their pull is 38% of Earth's. Uranus comes in third at 80% and Venus is 91%. The planet decorated with rings, Saturn has the closest pull to Earth's at 93%. Things get a bit heavier on Neptune, which has a pull of 20% more than Earth, and the massive planet of Jupiter has an incredible pull of 254%, which would make a person 154% heavier than on Earth.