Mountain Elevation: Why Some Peaks Are in Feet and Others in Meters

The short answer

Mountain elevation is reported in feet or meters depending on which country’s geological survey is the authoritative source. In the United States, peaks are typically in feet because the US Geological Survey publishes elevations in feet. In the rest of the world, peaks are typically in meters, including all the great ranges in Asia, Europe, South America, Africa, and Oceania. International climbing literature increasingly uses meters as a global standard, especially for the famous “eight-thousanders” (peaks above 8,000 m).

This guide walks through the unit conventions, the major peaks of each continent, and the historical reasons why the same mountain can be reported as “29,029 ft” or “8,848 m” depending on the source.

Why two systems coexist

The countries that maintain elevation surveys decide what units to publish. The US Geological Survey (USGS) uses feet. The Survey of India, Topographical Service of Nepal, Geographic Information Bureau of China, and the equivalent agencies in Pakistan, France, Switzerland, Argentina, and most other major mountainous countries use meters.

Once a survey publishes a number in its native unit, international sources convert as needed. The conversion is mechanical: meters multiplied by 3.28084 gives feet, or the exact value via the international foot definition. What can vary is which underlying survey is treated as canonical.

The classic case is Mount Everest. The 1856 Indian Trigonometric Survey gave 29,002 ft. The 1955 Indian survey gave 29,028 ft (8,848 m). The 1999 US National Geographic Society GPS survey gave 29,035 ft (8,850 m). The 2020 joint China-Nepal measurement gave 29,031.7 ft (8,848.86 m). All of these are correct within their measurement methods. The differences are real but reflect changes in survey technique and reference datum, not changes in the mountain.

The seven summits

The “seven summits” are the highest peaks on each continent, a popular target for ambitious mountaineers.

There is a long-running debate about whether the Australia/Oceania peak should be Mount Kosciuszko (2,228 m, the highest peak in mainland Australia) or Carstensz Pyramid (4,884 m, in Papua, which is part of the Australian tectonic plate and the Australasia geographic region). Both lists exist. Carstensz is more demanding to climb and is the version preferred by serious mountaineers.

In feet, Denali is reported by USGS as 20,310 ft, sometimes rounded to 20,320. The Survey of India used 20,237 ft for many years before the modern GPS survey corrected it.

The eight-thousanders

The fourteen peaks above 8,000 m are all in the Himalaya or Karakoram, the two great ranges of central Asia. The threshold is arbitrary (it could equally have been 7,500 m or 8,500 m) but has stuck because Reinhold Messner used it to mark his 1986 achievement of climbing all of them without supplemental oxygen.

Climbers refer to these peaks almost always by meters in international literature. “K2 is 8,611 m” is the canonical phrasing. Saying “K2 is 28,251 ft” sounds American and slightly out of place in international climbing conversation, although both are correct.

The “death zone”

Above 8,000 m (26,247 ft) is what climbers call the death zone, where the partial pressure of oxygen is so low that the human body cannot acclimatize. Cells start to die from lack of oxygen, and climbers can stay only for hours before serious harm.

The death-zone threshold is also why the 8,000 m club is meaningful. Climbing to 7,900 m and 8,100 m feels very different in the body, even though the height difference is only 200 m (656 ft). Above the threshold, the climber is racing against physiological deterioration.

For perspective on what 8,000 m means in other contexts: it is roughly the altitude of commercial cruise flight (see our flight levels guide), but humans in a pressurized cabin do not feel the effect. Mountain climbers experience the actual ambient pressure, which is the difference.

Common US peaks in feet (and meters)

For comparison, the highest peaks in the contiguous United States, where USGS uses feet:

Colorado alone has 53 peaks above 14,000 ft, called “fourteeners.” The Colorado fourteeners are a popular hiking goal because they are accessible, well-mapped, and within driving distance of Denver.

The highest peak in any US state outside Alaska is Mt. Whitney in California at 14,505 ft (4,421 m). The highest peak in Alaska is Denali at 20,310 ft (6,190 m), which is also the highest in North America.

The “altitude” vs “elevation” distinction

In strict usage, elevation is the height of a fixed point on the ground above a reference (usually mean sea level), and altitude is the height of a moving object above a reference. Mountains have elevations. Aircraft have altitudes.

In casual usage, both terms are often interchangeable, especially in journalism. Most readers do not notice the distinction. Climbers, surveyors, and pilots use the terms precisely.

The reference for both is mean sea level (MSL) for surface measurements, or the World Geodetic System 1984 ellipsoid (WGS84) for GPS measurements. GPS-measured elevations differ from MSL elevations by up to about 30 m depending on the location, because the geoid (the surface of mean sea level extended through continents) is not the same as the ellipsoid (a mathematical approximation of Earth’s shape). Modern surveys correct for the geoid-ellipsoid difference and report elevations relative to MSL.

Convert any peak elevation

For any peak elevation in meters or feet, the meters-to-feet calculator gives the exact conversion. Common peak elevations have dedicated pages: see 8,848 m for Everest or 6,190 m for Denali for examples.

For more on the historical reason countries chose different units, see our background guide Why is one foot exactly 0.3048 meters?.

Sources and further reading:

• USGS: Topographic maps and elevations
• Wikipedia: List of highest mountains on Earth
• Wikipedia: Seven Summits
• Wikipedia: Eight-thousander
• Our guide: Why aircraft cruise at 36,000 ft