Fact Check: Is the Moon Really Smaller Than Earth? the Exact Math Behind Planetary Scale
By Maya Lin-Takahashi
Linear measurements tell only part of the story. Because volume scales cubically relative to radius ($V = \frac{4}{3}\pi r^3$), small differences in diameter translate to massive discrepancies in internal capacity.
When running a direct lunar volume comparison, Earth holds roughly 1.083 trillion cubic kilometers of material. The Moon contains approximately 21.95 billion cubic kilometers. Dividing the two demonstrates that Earth's three-dimensional envelope could hold nearly 50 complete Moons packed inside.
Surface area follows a similar mathematical expansion. Earth’s surface area sits at 510.1 million square kilometers, with water covering roughly 71% of that space. The Moon’s entire surface area measures 37.9 million square kilometers, which represents just 7.4% of Earth's total exterior. The total surface area of the Moon is actually smaller than the continent of Asia, which covers roughly 44.6 million square kilometers. An explorer could traverse the entire lunar crust and still cover less territory than Asia and Africa combined.
Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.
