The size of planets is usually indicated in terms of their diameter. The diameter of a planet is defined as the "distance through the center of the planet from one point on the equator to the opposite side". The diameter of a planet is usually measured in kilometers (km) or miles.
Density is an indication of the amount of mass per volume in a planet. This does not include the atmosphere of a planet. Density is usually measured in kg/`~m^3` or lbs/`~ft^3`.
The diameter of Mercury is 4879 km. Its density is 5427 kg/`~m^3` .
The diameter of Venus is 12,104 km. Its density is 5243 kg/`~m^3` .
The diameter of Earth is 12,756 km. Its density is 5514 kg/`~m^3` .
The diameter of Mars is 6792 km. Its density is 3933 kg/`~m^3` .
The diameter of Jupiter is 142,984 km. Its density is 1326 kg/`~m^3` .
The diameter of Saturn is 120,536 km. Its density is 687 kg/`~m^3` .
The diameter of Uranus is 51,118 km. Its density is 1271 kg/`~m^3` .
The diameter of Neptune is 49,528 km. Its density is 1638 lbs/`~m^3` .
The diameter of Pluto (technically not considered a planet anymore) is 2370 km. Its density is 2095 lbs/`~m^3` .
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