There are 57,506,000 square miles of land surfaces in the world, including much that is uninhabitable by humans (Antarctica, arctic climes, swamps, mountains, and deserts).
The metric equivalent is 148,940,000 km2 and this represents 29.2% of the Earth's total surface area.
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The total surface area of Earth is approximately 510.1 million square kilometers.
Mars has a total surface area of approximately 55.9 million square miles.
The Earth's total surface area is approximately 510.1 million square kilometers.
Earth has a total land surface area of approximately 57.5 million square miles, which is equivalent to 36.8 billion acres.
The largest island on Earth is Greenland, with an area of approximately 836,300 square miles.