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Altitude to Pressure Conversion Table

Convert an altitude in feet or metres of height above sea level to a pressure reading in millibar (mbar, mb or mbr), 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).

Atmospheric pressure measurement products
ft m mbar psi mmHg inHg
-5000 -1524.0 1210.23 17.553 907.75 35.738
-4000 -1219.2 1168.55 16.948 876.48 34.507
-3000 -914.40 1128.03 16.361 846.09 33.311
-2000 -609.60 1088.66 15.790 816.56 32.148
-1000 -304.80 1050.41 15.235 787.87 31.018
-900 -274.32 1046.64 15.180 785.05 30.907
-800 -243.84 1042.89 15.126 782.23 30.796
-700 -213.36 1039.15 15.072 779.42 30.686
-600 -182.88 1035.41 15.017 776.62 30.576
-500 -152.40 1031.69 14.963 773.83 30.466
-400 -121.92 1027.98 14.910 771.05 30.356
-300 -91.440 1024.28 14.856 768.28 30.247
-200 -60.960 1020.59 14.802 765.51 30.138
-100 -30.480 1016.92 14.749 762.75 30.030
-50 -15.240 1015.08 14.723 761.37 29.975
0 0 1013.25 14.696 760.00 29.921
50 15.240 1011.42 14.669 758.63 29.867
100 30.480 1009.59 14.643 757.26 29.813
200 60.960 1005.95 14.590 754.52 29.706
300 91.440 1002.31 14.537 751.80 29.598
400 121.92 998.689 14.485 749.08 29.491
500 152.40 995.075 14.432 746.37 29.385
600 182.88 991.472 14.380 743.67 29.278
700 213.36 987.880 14.328 740.97 29.172
800 243.84 984.298 14.276 738.28 29.066
900 274.32 980.727 14.224 735.61 28.961
1000 304.80 977.166 14.173 732.93 28.856
2000 609.60 942.129 13.664 706.65 27.821
3000 914.40 908.117 13.171 681.14 26.817
4000 1219.2 875.105 12.692 656.38 25.842
5000 1524.0 843.073 12.228 632.36 24.896
6000 1828.8 811.996 11.777 609.05 23.978
7000 2133.6 781.854 11.340 586.44 23.088
8000 2438.4 752.624 10.916 564.51 22.225
9000 2743.2 724.285 10.505 543.26 21.388
10000 3048.0 696.817 10.106 522.66 20.577
15000 4572.0 571.820 8.2935 428.90 16.886
20000 6096.0 465.633 6.7534 349.25 13.750
25000 7620.0 376.009 5.4536 282.03 11.104
30000 9144.0 300.896 4.3641 225.69 8.8855
35000 10668 238.423 3.4580 178.83 7.0406
40000 12192 187.54 2.7200 140.67 5.5381
45000 13716 147.48 2.1390 110.62 4.3550
50000 15240 115.97 1.6821 86.987 3.4247
55000 16764 91.199 1.3227 68.405 2.6931
60000 18288 71.717 1.0402 53.792 2.1178
65000 19812 56.397 0.8180 42.301 1.6654
70000 21336 44.377 0.6436 33.286 1.3105
75000 22860 34.978 0.5073 26.236 1.0329
80000 24384 27.615 0.4005 20.713 0.8155
85000 25908 21.837 0.3167 16.379 0.6448
90000 27432 17.296 0.2509 12.973 0.5107
95000 28956 13.721 0.1990 10.291 0.4052
100000 30480 10.902 0.1581 8.1769 0.3219
Vacuum range absolute pressure measurement products

The height relative to sea level conversions are derived using the US Standard Atmosphere 1976 barometric formula for geopotential altitude with the following values[1-6] at heights from 5,000 ft (1524 m) below to 100,000 ft (30,480 m) above mean sea level.

  1. Standard atmospheric pressure of 1013.25 mb at 0 m, 226.321 mb at 11,000 m, 54.7489 mb at 20,000 m above mean sea level.
  2. Standard temperature of 288.15K (15°C) at 0 m, 216.65K (-56.5°C) at 11,000 m and 20,000 m above mean sea level.
  3. Standard thermal gradient or lapse rate of -0.0065 K/m from 0 to 11,000 m, 0 K/m from 11,000 to 20,000 m, 0.001 k/m from 20,000 to 32,000 m above mean sea level.
  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.

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

Atmospheric pressure measurement products