Calculate air pressure, density and boiling point at a given altitude.
Pressure falls roughly exponentially with altitude, reaching about three quarters of sea level at 2,500 metres. Water boils lower as a direct consequence, which is why cooking times lengthen in the mountains. Oxygen remains 21 per cent of the air at any altitude; it is the falling pressure rather than the composition that causes altitude sickness.
Air Pressure Altitude
Pressure = sea level pressure × (1 − 2.25577×10⁻⁵ × altitude)^5.25588
Pressure = sea level pressure × (1 − 2.25577×10⁻⁵ × altitude)^5.25588 Pressure falls roughly exponentially with altitude, reaching about three quarters of sea level at 2,500 metres. Water boils lower as a direct consequence, which is why cooking times lengthen in the mountains.
Oxygen remains 21 per cent of the air at any altitude; it is the falling pressure rather than the composition that causes altitude sickness.
This calculator takes 3 inputs: Altitude, Sea level pressure, Air temperature. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.