how big is the earth

The Earth has an equatorial diameter of about 12,756 kilometers (7,926 miles), making it the fifth largest planet in the solar system. It is not a perfect sphere but an oblate spheroid, slightly flattened at the poles and bulging at the equator. The surface area of Earth is approximately 510 million square kilometers (197 million square miles), with about 71% covered by oceans. The polar diameter is slightly smaller at about 12,725 kilometers (7,907 miles). Earth's circumference is approximately 40,075 kilometers (24,901 miles) around the equator and about 40,008 kilometers (24,860 miles) passing through the poles.