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Earth vs Mars Size Comparison

An earth is about 1.9 times wider than a mars: 7,920 miles (12,740 km) against 4,210 miles (6,779 km). By volume, about 6.6 marses would fit inside an earth.

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Which is bigger, an earth or a mars?

An earth is bigger. An earth is 3,710 miles (5,963 km) wider than a mars. That makes an earth 1.9× the size of a mars.

Measure	Earth	Mars
Size	7,920 miles (12,740 km) across	4,210 miles (6,779 km) across
Record size	—	—
Weight	—	—
Volume	≈ 1.1 × 10²¹ m³	≈ 1.6 × 10²⁰ m³

How many marses fit in an earth?

By volume, about 6.6 marses would fit inside an earth. That makes an earth 1.9× the size of a mars. 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.