How large is Juptier compared to Earth? Jupiter has a diameter of about 88,695 miles (142,800 kilometers) which is more than 11 times the diameter of Earth. It's volume is over 1,300 times the volume of Earth. This means that Jupiter is so big that over 1,300 Earths could fit inside of it. Jupiter is so big that it weighs two and a half times the weight of all of the other eight planets put together!