What is the size of each planet in our solar system compared to Earth?
The link below it to NASA's Planetary Fact Sheet which has lots of different information on the planets. I've obtained the relevant information from that source to provide the diameter and mass of each planet compared to Earth's. In order of distance from the sun, they are:
Mercury: 0.0553 x Earth's mass, 0.383 x Earth's diameter
Venus: 0.815x Earth's mass, 0.949 x Earth's diameter
Mars: 0.107 x Earth's mass, 0.532 x Earth's diameter
Jupiter: 317.8 x Earth's mass, 11.21 x Earth's diameter
Saturn: 95.2 x Earth's mass, 0.9.45 x Earth's diameter
Uranus: 14.5 x Earth's mass, 4.01 x Earth's diameter
Neptune: 17.1 x Earth's mass, 3.88 x Earth's diameter
Pluto: 0.0025 x Earth's mass, 0.186 x Earth's diameter
I've attached an image that gives you a visual comparison of the sizes of the planets.