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Olympus Mons is taller and vastly broader than Mount Everest, but published height figures for the Martian volcano vary by NASA source and measurement context. NASA/JPL gives Olympus Mons a height of 27 km (17 miles) and a base diameter of 600 km (373 miles). Everest rises about 8.85 km above Earth’s surface. Those figures make the scale difference clear without implying that every source measures Olympus Mons from the same base or reference level.
How tall is Olympus Mons compared with Mount Everest?
In NASA/JPL’s June 2024 comparison, Olympus Mons rises 27 km (17 miles), while NASA sources put Everest’s elevation at about 8,848 m (roughly 8.85 km). On those published figures, Olympus Mons is about three times as tall. This is a comparison of the stated measurements, not a newly harmonized calculation from a shared measurement standard.
NASA pages give different heights for Olympus Mons. The figures below should be read with their source and context rather than treated as interchangeable measurements:
| Source | Olympus Mons figure | Everest figure or context |
|---|---|---|
| NASA/JPL, June 27, 2024 | 27 km (17 miles) high | Not stated on this page |
| NASA Science Photojournal, image added August 11, 2023 | 21.9 km (13.6 miles; 72,000 feet) tall | 29,032 feet |
| NASA educational resource; publication date not stated on the reviewed page | 25 km (16 miles) high | Not stated in the cited figure |
| NASA Science, Mars: Facts; publication date not stated on the reviewed page | More than 40 km (25 miles; 132,000 feet) from base to summit | 8,848 m (29,029 feet) above Earth’s surface |
The pages do not establish a shared reference datum and base boundary that explains the differences among all four Olympus Mons figures. For Everest, the NASA pages also publish slightly different elevations: the Mars facts page gives 8,848 m (29,029 feet), while the Photojournal comparison gives 29,032 feet. Keep each value attached to its source rather than selecting one as if the pages agreed on a single comparison method.
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A Photojournal number that is not the volcano’s total height
The NASA Photojournal page also gives 7,757 m (25,449 feet), but that is the elevation change across the photographed escarpment, not the total height of Olympus Mons. It should not be used as the volcano’s height in a comparison with Everest.
How big is Olympus Mons by footprint?
Olympus Mons is a shield volcano on Mars. NASA/JPL gives its base diameter as 600 km (373 miles), while NASA Science describes its base area as comparable to the state of Arizona. These descriptions convey the volcano’s enormous footprint as well as its height.
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The cited NASA sources do not provide a comparable base-width measurement for Mount Everest, so a direct width ratio cannot be established from them. Everest is Earth’s highest peak; Olympus Mons is described by NASA as the solar system’s largest volcano.
Why are the two landforms so different?
Olympus Mons: a Martian shield volcano
Olympus Mons was built by volcanic activity. NASA’s explanation is that Mars had very active volcanoes early in its history and lacks tectonic plates that move over hotspots as they do on Earth. Without that plate motion, one volcanic site could continue building rather than being carried away from its magma source. NASA also says Mars’s lower gravity could let magma be pushed to greater heights. These factors help explain the scale of Martian volcanoes in NASA’s account.
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Everest: a mountain formed by continental collision
Everest’s geological story is tied to the Indian subcontinent colliding with Asia. NASA says that process began around 40 million years ago. The summit rock is marine limestone, a remnant of an ancient marine environment—not volcanic rock. The two peaks therefore differ not just in scale, but in how they formed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is the fairest way to compare their heights?
Everest’s figures describe elevation above Earth’s surface, while Olympus Mons is described using volcano-height figures that vary across NASA pages, including a specific base-to-summit description on the Mars facts page. Because the cited materials do not provide a common measurement definition for all Olympus Mons values, a precise universal ratio would imply more consistency than the sources establish.
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For a concise, recent comparison, use NASA/JPL’s June 2024 figures—27 km (17 miles) for Olympus Mons and approximately 8.85 km for Everest—while noting that other NASA pages publish different Olympus Mons heights. For scale beyond height, the 600 km (373-mile) base diameter and Arizona-sized base-area comparison are useful, but they are different ways of describing the volcano’s footprint.
Quick Recap
Sources
- NASA Science: Mars: Facts
- NASA/JPL: NASA’s Mars Odyssey Captures Huge Volcano, Nears 100,000 Orbits
- NASA Science Photojournal: Olympus Mons (PIA26055)
- NASA: How Big Is It?
- NASA/JPL-Caltech: Mars in a Minute: How Did Mars Get Such Enormous Mountains?
- NASA: The World’s Tallest Mountain
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