What Is the Diameter of the Earth?
The Earth has a diameter of 7,926.3 miles at the equator, and its circumference, or the distance around the earth at the equator, is 24,901.55 miles. The Earth is widest at the equator.
The diameter of the Earth at the poles is 7,899.8 miles. There is an equatorial bulge of 27 miles due to the rotation of the Earth.
The Earth's diameter is larger than that of Mercury at 3,032 miles, Mars at 4,222 miles and Venus at 7,521 miles. After Earth's, the next two largest diameters belong to Neptune at 30,778 miles and Uranus at 31,763 miles. Saturn has the second-largest diameter at 74,898 miles, and Jupiter has the largest at 88,846 miles. The diameter of Earth is about 2.6 times that of the smallest planet, Mercury, but Jupiter has a diameter that is more than 28.5 times that of Mercury.