Mauna Kea measures about 33,500 feet (10,210 meters) from its base on the ocean floor to its summit, making it the tallest mountain on Earth.
Quick Fact
Measured from its base on the ocean floor, Mauna Kea reaches 33,500 feet (10,210 meters) tall, including the 13,796 feet (4,205 meters) visible above sea level.
That beats Mount Everest’s 29,032-foot (8,848-meter) elevation above sea level. The crazy part? Most of that height sits underwater. Its base stretches about 19,700 feet (6,000 meters) below the ocean surface. Scientists use this “true” height because it shows the full rise from seafloor to peak. USGS backs these numbers up with sonar and seismic studies.
Geographic Context
Mauna Kea is located on Hawaiʻi Island (the Big Island), about 250 miles (400 km) southeast of Honolulu, with coordinates at 19°49'14.4"N 155°28'05.0"W.
It’s one of five shield volcanoes that make up the island, sitting within the Hawaiian-Emperor seamount chain. This chain formed from a volcanic hotspot under the Pacific Plate. Here’s the weird thing—about 80% of Mauna Kea’s height hides beneath the waves. Those gentle, broad slopes? Classic shield volcano shape, built over half a million to a million years of lava flow. The USGS keeps a close eye on it for safety and science.
Key Details
Mauna Kea’s total height from base to summit is approximately 33,500 feet (10,210 meters), with 13,796 feet (4,205 meters) above sea level.
| Volcano | Height Above Sea Level | Estimated Total Height | Status |
|---|
| Mauna Kea | 13,796 ft (4,205 m) | ~33,500 ft (10,210 m) | Dormant |
| Mauna Loa | 13,681 ft (4,169 m) | ~30,085 ft (9,170 m) | Active |
| Kīlauea | 4,091 ft (1,247 m) | ~16,000 ft (4,900 m) | Active (Paused as of 2026) |
These totals include the underwater sections. Mauna Loa still wins as the largest active volcano by volume, while Kīlauea’s one of the world’s most active. The above-sea-level heights are exact; the underwater parts come from sonar and bathymetric data by University of Hawaiʻi at Mānoa.
Interesting Background
Mauna Kea, or “White Mountain,” earned its name from its snow-capped summit in winter, and it holds deep cultural and scientific significance.
In Hawaiian tradition, the mountain’s sacred, tied to deities Poliʻahu and Lilinoe. Its dry, stable air and high elevation—above 40% of Earth’s atmosphere—make it perfect for astronomy. You’ll find 13 international observatories up there, like the Keck Observatory and Subaru Telescope. Geologically, it started forming nearly a million years ago and last erupted about 4,500 years back. For more on its history and science, Britannica has you covered.
Practical Information
Visitors should travel in a 4WD vehicle, acclimate at 9,200 feet, and check weather and road conditions before summiting.
Don’t even think about taking a regular car to the top—those last 8 miles are rough. Stop at the Onizuka Center for International Astronomy first to adjust to the altitude. Oxygen drops 40% above 13,000 feet, and temps can dip below freezing even in summer. Always check road closures and cultural access rules on their site. Keep an eye on volcanic activity via USGS updates, especially after Mauna Loa’s 2022 eruption. And respect the mountain—stick to approved trails and honor its sacred status.
