That depends on how you define size, which can be measured in many different ways, including as diameter, circumference, surface area, volume, mass, or even gravitational influence. In terms of diameter, Earth has a diameter of approximately 12,742 kilometers (7,918 miles) at the equator. However, if you measure size by mass, Earth has a mass of approximately 5.97 x 10^24 kilograms (1.32 x 10^25 pounds).

Earth has a circumference of approximately 40,075 kilometers (24,901 miles) at the equator. Its total surface area is about 510.1 million square kilometers (196.9 million square miles). In terms of volume, Earth has a total volume of about 1.08 trillion cubic kilometers (259.9 billion cubic miles).

Another way to measure the size of a planet is by its gravitational influence. Earth's gravitational force is about 9.8 meters per second squared (32.2 feet per second squared), which is denoted as 1*g*, or one unit of gravitational acceleration.
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