What Is the Air Pressure at Mount Everest Summit (8,849 m)?
The atmospheric pressure at the Everest summit (~8,849 m) is approximately 314 hPa — about one-third of sea level.
How to use this tool
- Enter your altitude in metres above sea level.
- The calculator uses the international standard atmosphere barometric formula to compute pressure.
- Results are shown in hectopascals (hPa), PSI, and as a percentage of sea-level pressure.
At the summit of Mount Everest (8,849 m), air pressure is only about one-third of sea-level pressure, making supplemental oxygen essential.
Frequently asked questions
- How does altitude affect air pressure?
- Atmospheric pressure decreases with altitude because there is less air above. At 1000 m, pressure is about 89% of sea level. At 5000 m (similar to high-altitude treks), pressure drops to around 54% of sea level.
- What is the barometric formula?
- The standard barometric formula is P = 1013.25 × (1 − 2.2557×10⁻⁵ × h)^5.25588, where h is altitude in metres and P is pressure in hPa. It is valid up to about 11,000 m.
- How does altitude affect the human body?
- At altitudes above 2400 m (8000 ft), reduced oxygen availability can cause altitude sickness (AMS). Above 5500 m, acclimatisation becomes very difficult and supplemental oxygen may be needed.