Air Pressure at Altitude Calculator

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ISA uses the ICAO 1976 standard sea-level conditions. Custom lets you enter measured pressure and temperature.
Altitude above mean sea level (MSL).
m
Air pressureHigh-altitude air
701.09

Atmospheric pressure at the specified altitude

Pressure (Pa)70,108.5
Pressure (hPa / mbar)701.09
Pressure (atm)0.6919
Pressure (mmHg / Torr)525.86
Pressure (inHg)20.703
ISA temperature-4.5C
Air density0.9091kg/m3
Fraction of sea-level pressure69.2%
69.2% % of sea-level
Extreme altitude<30%Very high altitude30%-50%High altitude50%-75%Low altitude75%-98%Sea level98%+

Air pressure at 3000 m: 701.09 hPa

  • At this altitude the air pressure is 69.2% of standard sea-level pressure (101,325 Pa).
  • Air density is 0.9091 kg/m3, compared to 1.2250 kg/m3 at sea level - a reduction of 25.8%.
  • ISA standard temperature at this altitude is -4.5 C.
  • Aircraft cabins are typically pressurized to an equivalent altitude of 1,800 to 2,400 m for passenger comfort.

Next stepFor aviation density-altitude calculations, combine this pressure with temperature to find the effective altitude for aircraft performance.

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