The sun has a radius of about 432,450 miles and a diameter of about 864,938 miles and is the largest object in the solar system. The sun's circumference measures approximately 2.7 million miles.
The sun is also the most massive object in the solar system. It contains 99.8 percent of the solar system's total mass and is about 333,000 times the mass of the Earth. With a volume of 1.4 x 1027 cubic meters, about 1.3 million Earths could fit inside the sun. However, compared to other stars, the sun is just average in size. There are stars that are 700 times bigger than the sun.