Below should be a table of the planets. The relative size means that the planet is some number time the size of the earth. A 4.00 would mean that the planet is 4 time the size of the earth and a 0.5 would mean it was about half the size of the earth.

Planet Diameter (km) Relative size to earth
Jupiter142800 11.20
Mars 6785 0.53
Mercury 4878 0.38
Neptune 49493 3.88
Pluto 2301 0.18
Saturn 119871 9.40
Earth 12753 1.00
Uranus 51488 4.04
Venus 12140 0.95