<p>Mars has a mass that is 10.7% that of Earth (<a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html" rel="nofollow noreferrer">NASA Planetary datasheet</a>).
The numerical value of the mass quoted for Mars in your question appears to be correct.</p>
<p>I don't think there are &quot;many different figures around&quot; and the phys.org article, which quotes the correct masses for both planets in the same paragraph, has clearly just calculated the percentage incorrectly.</p>

CC BY-SA 4.0
2024-09-07T16:00:57.660Z
2024-09-07T16:00:57.660Z
ProfRob
<p>According to,</p>
<p><a href="https://phys.org/news/2015-12-mars-earth.html#google_vignette" rel="nofollow noreferrer">phys.org</a></p>
<blockquote>
<p>it's mass is just 6.4185 x 10<span class="math-container">$^{23}$</span> kg, which is around 15% that of
Earth's</p>
</blockquote>
<p>According to,</p>
<p><a href="https://www.universetoday.com/22603/mars-compared-to-earth/" rel="nofollow noreferrer">Universe Today</a></p>
<blockquote>
<p>However, it’s mass is just 6.4185 x 10²³ kg, which is around 10.7%
that of Earth’s.</p>
</blockquote>
<p>According to,</p>
<p><a href="https://letstalkscience.ca/educational-resources/backgrounders/earth-vs-mars#:%7E:text=Though%20Mars%20is%2015%25%20of,of%20gravity%20on%20Earth%27s%20surface." rel="nofollow noreferrer">Letstalkscience.ca</a></p>
<blockquote>
<p>Though Mars is 15% of Earth’s volume, it is only 11% of Earth’s mass.</p>
</blockquote>
<p>What's the real figure of Mars's mass compared to Earth?</p>

CC BY-SA 4.0
2024-09-07T19:39:02.553Z
Using https://ssd.jpl.nasa.gov/astro_par.html, ~10.74468%. That Mars GM includes Phobos & Deimos, but that doesn't affect the first 6 digits of the mass ratio.
PM 2Ring
<mars><mass>
What's Mars mass compared to Earth since there are many different figures around?
Pablo
# What's Mars mass compared to Earth since there are many different figures around?

(Asked by: username_0 on 2024-09-07)

According to,

[phys.org](https://phys.org/news/2015-12-mars-earth.html#google_vignette)

> it's mass is just 6.4185 x 10$^{23}$ kg, which is around 15% that of
> Earth's

According to,

[Universe Today](https://www.universetoday.com/22603/mars-compared-to-earth/)

> However, it’s mass is just 6.4185 x 10²³ kg, which is around 10.7%
> that of Earth’s.

According to,

[Letstalkscience.ca](https://letstalkscience.ca/educational-resources/backgrounders/earth-vs-mars#:%7E:text=Though%20Mars%20is%2015%25%20of,of%20gravity%20on%20Earth%27s%20surface.)

> Though Mars is 15% of Earth’s volume, it is only 11% of Earth’s mass.

What's the real figure of Mars's mass compared to Earth?

**Tags:** mars, mass

> **Comments:**
> **username_1**: Using https://ssd.jpl.nasa.gov/astro_par.html, ~10.74468%. That Mars GM includes Phobos & Deimos, but that doesn't affect the first 6 digits of the mass ratio.  

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## 1 answers

### Answer by username_2 on 2024-09-07. Score: 4 | Accepted answer

Mars has a mass that is 10.7% that of Earth ([NASA Planetary datasheet](https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html)).
The numerical value of the mass quoted for Mars in your question appears to be correct.

I don't think there are "many different figures around" and the phys.org article, which quotes the correct masses for both planets in the same paragraph, has clearly just calculated the percentage incorrectly.


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