# 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 (15°C)
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

 -5000 ft -1524 m is 1210.23 mb/hPa 17.553 psi 907.75 mmHg 35.738 inHg -4000 ft -1219.2 m is 1168.55 mb/hPa 16.948 psi 876.48 mmHg 34.507 inHg -3000 ft -914.4 m is 1128.03 mb/hPa 16.361 psi 846.09 mmHg 33.311 inHg -2000 ft -609.6 m is 1088.66 mb/hPa 15.79 psi 816.56 mmHg 32.148 inHg -1000 ft -304.8 m is 1050.41 mb/hPa 15.235 psi 787.87 mmHg 31.018 inHg -900 ft -274.32 m is 1046.64 mb/hPa 15.18 psi 785.05 mmHg 30.907 inHg -800 ft -243.84 m is 1042.89 mb/hPa 15.126 psi 782.23 mmHg 30.796 inHg -700 ft -213.36 m is 1039.15 mb/hPa 15.072 psi 779.42 mmHg 30.686 inHg -600 ft -182.88 m is 1035.41 mb/hPa 15.017 psi 776.62 mmHg 30.576 inHg -500 ft -152.4 m is 1031.69 mb/hPa 14.963 psi 773.83 mmHg 30.466 inHg -400 ft -121.92 m is 1027.98 mb/hPa 14.91 psi 771.05 mmHg 30.356 inHg -300 ft -91.44 m is 1024.28 mb/hPa 14.856 psi 768.28 mmHg 30.247 inHg -200 ft -60.96 m is 1020.59 mb/hPa 14.802 psi 765.51 mmHg 30.138 inHg -100 ft -30.48 m is 1016.92 mb/hPa 14.749 psi 762.75 mmHg 30.03 inHg -50 ft -15.24 m is 1015.08 mb/hPa 14.723 psi 761.37 mmHg 29.975 inHg 0 ft 0 m is 1013.25 mb/hPa 14.696 psi 760 mmHg 29.921 inHg 50 ft 15.24 m is 1011.42 mb/hPa 14.669 psi 758.63 mmHg 29.867 inHg 100 ft 30.48 m is 1009.59 mb/hPa 14.643 psi 757.26 mmHg 29.813 inHg 200 ft 60.96 m is 1005.95 mb/hPa 14.59 psi 754.52 mmHg 29.706 inHg 300 ft 91.44 m is 1002.31 mb/hPa 14.537 psi 751.8 mmHg 29.598 inHg 400 ft 121.92 m is 998.689 mb/hPa 14.485 psi 749.08 mmHg 29.491 inHg 500 ft 152.4 m is 995.075 mb/hPa 14.432 psi 746.37 mmHg 29.385 inHg 600 ft 182.88 m is 991.472 mb/hPa 14.38 psi 743.67 mmHg 29.278 inHg 700 ft 213.36 m is 987.88 mb/hPa 14.328 psi 740.97 mmHg 29.172 inHg 800 ft 243.84 m is 984.298 mb/hPa 14.276 psi 738.28 mmHg 29.066 inHg 900 ft 274.32 m is 980.727 mb/hPa 14.224 psi 735.61 mmHg 28.961 inHg 1000 ft 304.8 m is 977.166 mb/hPa 14.173 psi 732.93 mmHg 28.856 inHg 2000 ft 609.6 m is 942.129 mb/hPa 13.664 psi 706.65 mmHg 27.821 inHg 3000 ft 914.4 m is 908.117 mb/hPa 13.171 psi 681.14 mmHg 26.817 inHg 4000 ft 1219.2 m is 875.105 mb/hPa 12.692 psi 656.38 mmHg 25.842 inHg 5000 ft 1524 m is 843.073 mb/hPa 12.228 psi 632.36 mmHg 24.896 inHg 6000 ft 1828.8 m is 811.996 mb/hPa 11.777 psi 609.05 mmHg 23.978 inHg 7000 ft 2133.6 m is 781.854 mb/hPa 11.34 psi 586.44 mmHg 23.088 inHg 8000 ft 2438.4 m is 752.624 mb/hPa 10.916 psi 564.51 mmHg 22.225 inHg 9000 ft 2743.2 m is 724.285 mb/hPa 10.505 psi 543.26 mmHg 21.388 inHg 10000 ft 3048 m is 696.817 mb/hPa 10.106 psi 522.66 mmHg 20.577 inHg 15000 ft 4572 m is 571.82 mb/hPa 8.2935 psi 428.9 mmHg 16.886 inHg 20000 ft 6096 m is 465.633 mb/hPa 6.7534 psi 349.25 mmHg 13.75 inHg 25000 ft 7620 m is 376.009 mb/hPa 5.4536 psi 282.03 mmHg 11.104 inHg 30000 ft 9144 m is 300.896 mb/hPa 4.3641 psi 225.69 mmHg 8.8855 inHg 35000 ft 10668 m is 238.423 mb/hPa 3.458 psi 178.83 mmHg 7.0406 inHg

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