To compare a mountain on Mars with one on Earth, first check what its height is measured from. A summit’s elevation above a planet-wide reference surface is not the same as the mountain’s rise from its local base. NASA reports different Olympus Mons figures under different comparison setups, so “three times taller than Everest” is not a universal, definition-free result.
Why the baseline matters
On Earth, elevations are commonly given relative to sea level. Mars has no ocean sea level. In its Mars Global Surveyor Laser Altimeter dataset documentation, NASA’s Planetary Data System says Martian topography is referenced to an equipotential surface called the areoid. That is a reference surface—not a Martian sea—and it is not automatically equivalent to Earth’s sea-level reference. NASA Planetary Data System: Mars Global Surveyor MOLA MEGDR
As an Amazon Associate I earn from qualifying purchases.
For any comparison, keep two questions separate: how high is the summit above the chosen datum, and how far does the mountain rise above the terrain around its base? Those measurements can differ, especially for a broad volcano. A number without its baseline leaves the comparison ambiguous.
What NASA’s Olympus Mons and Everest figures say
NASA Science currently describes Olympus Mons as more than 25 miles (more than 132,000 feet, or 40 km) tall from base to summit. The same page gives Mount Everest as 29,029 feet (8,848 m) above Earth’s surface. These are the figures and definitions stated on that page; they should not be silently mixed with values framed differently elsewhere. NASA Science: Mars Facts
#1 Best Overall
- Mars in Motion – A Realistic Look at the Red Planet - Golden-red surface tones with volcanic ridges and weathered terrain bring Mars to life. An inspiring piece for space lovers and science fans alike.
- Self-Rotating Technology Powered by Light - MOVA’s patented design silently spins the globe using ambient light and the Earth’s magnetic field — no batteries or cords required.
- Premium Build with Seamless Movement - A fluid-suspended inner globe rotates within a clear acrylic outer shell, offering a smooth, almost magical visual experience.
- Perfectly Sized for Personal Spaces - Measuring 4.5 inches in diameter (about softball size), it fits beautifully on desks, shelves, and side tables as a compact cosmic accent.
- Gift-Worthy for Dreamers and Thinkers - A thoughtful present for science enthusiasts, educators, students, and anyone fascinated by space. MOVA Globes spark imagination and lasting conversations.
A NASA/JPL educational poster instead describes Olympus Mons as over 27 km (about 90,000 ft) tall and Everest as about 9 km (about 29,000 ft), calling Olympus Mons about three times Everest’s height. Treat that as the poster’s attributed comparison, not as an exact ratio that applies to every definition of height. NASA/JPL: How High Are the Mountains?
These NASA materials give differently framed Olympus Mons figures. Do not average them or present them as interchangeable: the comparison depends on the measurement definition and source.
Rank #2
- Mars in Motion – A Realistic Look at the Red Planet - Golden-red surface tones with volcanic ridges and weathered terrain bring Mars to life. An inspiring piece for space lovers and science fans alike.
- Self-Rotating Technology Powered by Light - MOVA’s patented design silently spins the globe using ambient light and the Earth’s magnetic field — no batteries or cords required.
- Premium Build with Seamless Movement - A fluid-suspended inner globe rotates within a clear acrylic outer shell, offering a smooth, almost magical visual experience.
- More to Explore - Our larger Mars globe offers richer surface detail and stronger visual presence, ideal for offices and display cabinets.
- Gift-Worthy for Dreamers and Thinkers - A thoughtful present for science enthusiasts, educators, students, and anyone fascinated by space. MOVA Globes spark imagination and lasting conversations.
How to make a fair comparison
- Identify the measurement. Check whether each number is summit elevation above a datum or base-to-summit relief.
- Name the reference surface. For Mars, the cited MOLA dataset uses the areoid; for the Earth figures discussed here, sources refer to sea level or Earth’s surface. Do not imply those zero surfaces are physically identical.
- Check how the local base was chosen. A broad shield volcano does not have a single obvious edge, and choosing a different surrounding plain can change its stated base-to-summit height.
- Compare like with like. For a numerical ratio, use measurements defined consistently for both mountains. NASA’s cited educational comparisons do not establish one standardized local-base measurement for every named peak.
Why mountain comparison graphics can mislead
NASA’s Mount Sharp comparison explicitly uses different baselines: Mount Sharp’s elevation is relative to the floor of Gale Crater, while Mount Rainier, Mount McKinley and Mount Everest are measured relative to Earth’s sea level. The graphic is useful for visual context, but its labels do not describe all four heights from the same kind of starting point. NASA: Mount Sharp Compared to Earth Mountains
Free tools Windows power users keep installed
One-click scans. No signup required.
Earth mountains also change height with the measure
Everest’s commonly cited elevation is not the only meaningful way to describe a mountain’s vertical scale. NASA Goddard’s educational comparison gives Mauna Kea at about 10 km when measured from the ocean floor, illustrating how a mountain’s rise from its base can differ from its elevation above sea level. NASA Goddard: Earth-Mars Volcano Comparisons: Elevation Color-Mapped Mars
Rank #3
- Globe Diameter : 24cm / 9.5"
- Item Size : 9.5"D X 14"H X 10"W / D 24cm X H 36cm X W 26cm / Diameter X Height X Width
- Name : Explorer Red Mars Globe, 24cm/9.5"
- Color : Red (Mars surface) / Uses images from NASA
- Base Material : Plastic Dark Brown (ABS)
That comparison also gives Olympus Mons at about 23 km, but its description does not provide enough detail to equate that value with every other source’s Olympus Mons definition. It is another reason to retain the source’s stated setup rather than forcing all reported values into one ranking.
Quick Recap
Rank #4
- Size : 12"D X 18"H X 13"W / D 30cm X H 45cm X 33cm
- Material(Globe / Meridian / Base) : Plastic Dark Brown (ABS)
- Technique : Vacuum formed (Erasable markers ; Write-on, wipe-off)
- Language : Latin & English, Color : Red, Scale : 1 / 22,640,000, Rotation axis : 23.5°
- Over 600 place names including. Includes illustrations.(Landers/Rovers)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
