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Earth vs Moon Size Comparison

An earth is about 3.7 times wider than the Moon: 7,920 miles (12,740 km) against 2,160 miles (3,475 km). By volume, about 49 moons would fit inside an earth.

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Which is bigger, an earth or the Moon?

An earth is bigger. An earth is 3.7× the size of the Moon: about 3.7 moons lined up would match it.

Measure	Earth	Moon
Size	7,920 miles (12,740 km) across	2,160 miles (3,475 km) across
Record size	—	—
Weight	—	—
Volume	≈ 1.1 × 10²¹ m³	≈ 2.2 × 10¹⁹ m³

How many moons fit in an earth?

By volume, about 49 moons would fit inside an earth. An earth is 3.7× the size of the Moon: about 3.7 moons lined up would match it. Volume grows with the cube of length, which is why the volume number is so much bigger.

Where do these numbers come from?

Sizes are typical adult or reported values, rounded for readability. Read how we measure and compare sizes.