Results for “how big is mars compared to earth” · retrieved September 22, 2026
Mars is about half the size of Earth in diameter and has only about 11% of Earth's mass.
Answer details
Diameter Comparison
Mars has an equatorial diameter of approximately 6,791 to 6,792 kilometers, which is roughly 53% of Earth's diameter of about 12,742 kilometers.
Mass Comparison
The mass of Mars is approximately 0.107 to 0.11 times that of Earth, meaning it is significantly less massive.
Volume Comparison
Mars has a volume of about 163 billion cubic kilometers, which is approximately 15% of Earth's total volume.
Surface Area Context
Although Mars is much smaller overall, its surface area is roughly equivalent to the total land area of Earth because most of Earth's surface is covered by oceans.
Sources 8
About this answerMars Fact Sheet
| | Mars | Earth | Ratio (Mars/Earth) || --- | --- | --- | --- || Mass (10 24 kg) | 0.64169 | 5.9722 | 0.107 || Volume (10 10 km 3) | 16.312 | 108.321 | 0.151 || Equatorial radius (km) | 3396.2 | 6378.1 | 0.532 || Polar radius (km) | 3376.2 | 6356.8 | 0.531 || Volumetric mean radius (km) | 3389.5 | 6371.0 | 0.532 || Core radius (km) | 1830 | 3485 | 0.525 || Ellipticity (Flattening) | 0.00589 | 0.00335 | 1.76 || Mean density (kg/m 3) | 3934 | 5
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Mars: Facts
With a radius of 2,106 miles (3,390 kilometers), Mars is about half the size of Earth. If Earth were the size of a nickel, Mars would be about as big as a raspberry....When the solar system settled into its current layout about 4.5 billion years ago, Mars formed when gravity pulled swirling gas and dust in to become the fourth planet from the Sun. Mars is about half the size of Earth, and like its fellow terrestrial planets, it has a central core
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How Big is Mars? | Size, Compared to Earth, Mass, Gravity ...
Mars is a small planet, larger than only Mercury and slightly more than half the size of Earth. Its equatorial radius measures 3,396 kilometers (2,110 miles), with a mean polar radius of 3,379 kilometers (2,100 miles). By comparison, Earth’s equatorial radius is 6,378 kilometers (3,963 miles)....The mass of Mars is only one-tenth of Earth’s mass, a difference that contributes to the smaller planet’s lower gravitational pull. Mars’s gravitational
September 18, 2026
Planet Sizes and Locations in Our Solar System
Mars Mars, the red planet, is the seventh largest planet in our solar system. Mars is about half the width of Earth, and has an equatorial diameter of about 4,221 miles (6,792 kilometers). Mars is the fourth planet from the Sun, orbiting at an average distance of 141.6 million miles (227.9 million kilometers). Mars is about 49 million miles (79 million kilometers) farther from the Sun than Earth. Explore Mars The global mosaic of Mars was cr
April 22, 2025
Mars vs Earth — How the Two Planets Compare (Side by Side)
Earth is the bigger of the two. Mars's diameter is about 6,791 km (4,219 miles), which is roughly half of Earth's 12,742 km (7,918 miles). If Earth were a tennis ball, Mars would be a golf ball....Mars also weighs a lot less. It has only about 11% of Earth's mass, partly because it's smaller and partly because its core has less iron in it. That smaller mass is the reason Martian gravity is much weaker than ours....| Feature | Earth | Mars || ---
May 6, 2026
1. Earth-Mars Comparison
This image compares Mars and Earth in their correct relative sizes. Mars (diameter 6790 kilometers) is only slightly more than half the size of Earth (diameter 12750 kilometers). Note the difference in color between the two planets. Almost 70% of Earth's surface is covered by liquid water. In contrast, Mars now has no liquid water on its surface and is covered with bare rock and dust. The four dark circles in the Mars image are the Tharsis shield
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Planetary Fact Sheet - Ratio to Earth
| | MERCURY | VENUS | EARTH | MOON | MARS | JUPITER...NEPTUNE...| Mass | 0.0553 | 0.815 | 1 | 0.0123 | 0.107 | 317.8 | 95.2 | 14.5 | 17.1 | 0.0022 |
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Mars Compared to Earth
In terms of their size and mass, Earth and Mars are quite different. With a mean radius of 6371 km and a mass of...5.97×1024kg..., Earth is the fifth largest and fifth most-massive planet in the Solar System, and the largest of the terrestrial planets. Mars, meanwhile, has a radius of approximately 3,396 km at its equator (3,376 km at its polar regions), which is the equivalent of roughly 0.53 Earths. However, it's mass is just 6.4185 x 10²³ kg,
December 5, 2015
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