The diameter is roughly 5500 miles and the size of it around
would be (estimate) around 13,000 miles.
The diameter of the earth at the equator is 12,756.32 kilometers, or 7,926.41 miles. The diameter of the earth through the poles is 12,715.43 kilometers, or 7,901 miles. Thus the earth is 41 km or 25 miles wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like ball).