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The total surface area of the Moon is 37.9 million square kilometers, or 14.6 million square miles.
Need some context? The surface area of the Earth is 510 million square kilometers. In other words, the total surface area of the Moon is only 7.4% the surface area of the Earth. If you could unwrap the Moon and lay it out flat on the Earth, it wouldn’t fill up Asia, which has an area of 44.4 million square kilometers.
Wondering about some other aspects of the Moon? Here’s an article about the mass of the Moon, and here’s one about the diameter of the Moon.
Want some more general information about the Moon? Check out NASA’s Lunar and Planetary Science page. And here’s the Solar System Exploration Guide.
You can listen to a very interesting podcast about the formation of the Moon from Astronomy Cast, Episode 17: Where Did the Moon Come From?