The Earth is about 12,742 kilometers (7,918 miles) wide.

Earth’s size is easy to grasp because we live on it. Its diameter measures roughly 12,742 kilometers, which is about the distance you’d travel flying from London to New York and back again. This size makes Earth a medium-sized planet in our solar system, bigger than Mars but smaller than Jupiter. Knowing Earth’s size helps us understand distances, travel times, and the scale of life on our planet.