How big is Earth?
The Earth is a relatively small planet in our solar system. Its diameter is about 7,918 miles (12,742 kilometres) at the equator and 7,900 miles (12,714 kilometres) at the poles. The circumference of the Earth at the equator is about 40,075 kilometres (24,901 miles), and its total surface area is about 510 million square kilometres (196.9 million square miles). The Earth has a mass of about 5.97 x 10^24 kilograms, and its gravity is about 9.8 metres per second squared (32.2 feet per second squared).