Altitude Units to Pressure Units Conversion Table

Convert from an altitude in feet or metres above sea level to a pressure reading in millibar (mbar, mb or mbr), hectopascals (hPa), pounds per square inch (psi), millimetres of mercury at zero degrees celsius (mmHg @ 0 deg C) or inches of mercury at zero degrees celsius ( inHg @ 0 deg C).

The height relative to sea level conversions are derived using the US Standard Atmosphere 1976 barometric formula for geopotential altitude with the following physical constants and multi-valued (*) constants for sea level up to a height of 36,089 ft (11,000m)

1. *Standard atmospheric pressure of 1013.25 mb absolute at sea level
2. *Standard temperature of 288.15 K (15C)
3. *Standard thermal gradient or lapse rate of -0.0065 K/m increase in altitude
4. Standard acceleration due to gravity of 9.80665 m/s2
5. Gas constant for air of 8.31432 J/Kmol K
6. Molar mass of air of 0.0289644 kg/mole

Please note that the calculated altitude values are not absolutely precise conversions and should not be treated as such.




Altitude to Pressure Conversion Table

-5000ft-1524.0mis1210.23mb/hPa17.553psi907.75mmHg35.738inHg
-4000ft-1219.2mis1168.55mb/hPa16.948psi876.48mmHg34.507inHg
-3000ft-914.40mis1128.03mb/hPa16.361psi846.09mmHg33.311inHg
-2000ft-609.60mis1088.66mb/hPa15.790psi816.56mmHg32.148inHg
-1000ft-304.80mis1050.41mb/hPa15.235psi787.87mmHg31.018inHg
-900ft-274.32mis1046.64mb/hPa15.180psi785.05mmHg30.907inHg
-800ft-243.84mis1042.89mb/hPa15.126psi782.23mmHg30.796inHg
-700ft-213.36mis1039.15mb/hPa15.072psi779.42mmHg30.686inHg
-600ft-182.88mis1035.41mb/hPa15.017psi776.62mmHg30.576inHg
-500ft-152.40mis1031.69mb/hPa14.963psi773.83mmHg30.466inHg
-400ft-121.92mis1027.98mb/hPa14.910psi771.05mmHg30.356inHg
-300ft-91.440mis1024.28mb/hPa14.856psi768.28mmHg30.247inHg
-200ft-60.960mis1020.59mb/hPa14.802psi765.51mmHg30.138inHg
-100ft-30.480mis1016.92mb/hPa14.749psi762.75mmHg30.030inHg
-50ft-15.240mis1015.08mb/hPa14.723psi761.37mmHg29.975inHg
0ft0mis1013.25mb/hPa14.696psi760.00mmHg29.921inHg
50ft15.240mis1011.42mb/hPa14.669psi758.63mmHg29.867inHg
100ft30.480mis1009.59mb/hPa14.643psi757.26mmHg29.813inHg
200ft60.960mis1005.95mb/hPa14.590psi754.52mmHg29.706inHg
300ft91.440mis1002.31mb/hPa14.537psi751.80mmHg29.598inHg
400ft121.92mis998.689mb/hPa14.485psi749.08mmHg29.491inHg
500ft152.40mis995.075mb/hPa14.432psi746.37mmHg29.385inHg
600ft182.88mis991.472mb/hPa14.380psi743.67mmHg29.278inHg
700ft213.36mis987.880mb/hPa14.328psi740.97mmHg29.172inHg
800ft243.84mis984.298mb/hPa14.276psi738.28mmHg29.066inHg
900ft274.32mis980.727mb/hPa14.224psi735.61mmHg28.961inHg
1000ft304.80mis977.166mb/hPa14.173psi732.93mmHg28.856inHg
2000ft609.60mis942.129mb/hPa13.664psi706.65mmHg27.821inHg
3000ft914.40mis908.117mb/hPa13.171psi681.14mmHg26.817inHg
4000ft1219.2mis875.105mb/hPa12.692psi656.38mmHg25.842inHg
5000ft1524.0mis843.073mb/hPa12.228psi632.36mmHg24.896inHg
6000ft1828.8mis811.996mb/hPa11.777psi609.05mmHg23.978inHg
7000ft2133.6mis781.854mb/hPa11.340psi586.44mmHg23.088inHg
8000ft2438.4mis752.624mb/hPa10.916psi564.51mmHg22.225inHg
9000ft2743.2mis724.285mb/hPa10.505psi543.26mmHg21.388inHg
10000ft3048.0mis696.817mb/hPa10.106psi522.66mmHg20.577inHg
15000ft4572.0mis571.820mb/hPa8.2935psi428.90mmHg16.886inHg
20000ft6096.0mis465.633mb/hPa6.7534psi349.25mmHg13.750inHg
25000ft7620.0mis376.009mb/hPa5.4536psi282.03mmHg11.104inHg
30000ft9144.0mis300.896mb/hPa4.3641psi225.69mmHg8.8855inHg
35000ft10668mis238.423mb/hPa3.4580psi178.83mmHg7.0406inHg

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