There are several things in our solar system bigger than the Earth; the Sun and all the gas giants like Jupiter. But of the four terrestrial planets - the rocky worlds you could actually walk on if appropriately attired (Venus has a strict jacket and tie requirement) - the Earth is the largest. You have to take the Earth’s shape into consideration when measuring its diameter as the planet bulges along its equator at 24,901.5 miles circumference and is slightly shorter if you measure around its poles with a circumference of 24,859 miles. The difference is due to the planet’s rotation.
Earth’s mass comes in at about 6.0 X 1024 kilograms (derived by using Newton’s Law of Gravity - F=GmM/r2 ) but the measurement of mass is out of date almost as soon as its made. The Earth is constantly gaining mass from dust and material that falls into its gravity well.
To see how the Earth stacks up in size relative to the other planets in our solar system, visit Rense.com. This site has a mind boggling set of pictures that show how everything stacks up. Even better, it shows how truly tiny the Sun is relative to some other monstrous stars.