How strong is the gravity on Saturn? Although Saturn is much larger than Earth, its surface gravity is less than the surface gravity on Earth. This is because Saturn is made up of gases and is not solid like Earth. This makes Saturn very light for its size. Actually, Saturn has the lowest density of all the planets in our solar system! The surface gravity on Saturn is about 74% of the surface gravity on Earth, so if you weigh 100 pounds on Earth, you would weigh 74 pounds on Saturn.