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
- Air flow normalising calculation barometric pressure transmitter
- Barometric & Atmospheric Pressure Gauges
- 23 to 33 inHg barometric range pressure transducer with a 10 volt hi-resolution output
- Low pressure inflatable control with atmospheric pressure changes
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
- Vacuum gauge to measure both absolute & negative gauge pressure
- Depression vacuum 1 bar absolute range 0-5V output automotive test pressure sensor
- 50 kPa absolute vacuum air pressure gauge with 1/4 NPT male fitting
- Vacuum insulation 15 psi absolute range millivolt output pressure sensor for air extraction use
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.
- 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.
- 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.
- 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.
- Standard acceleration due to gravity of 9.80665 m/s².
- Gas constant for air of 8.31432 J/Kmol K.
- 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
- Barometric Pressure Transmitters
- 500-1100 mbar absolute range 0-5 volts output barometric pressure sensor
- 10 metre range non-vented submersible absolute range pressure and barometric sensor
- Wide barometric range high precision pressure transmitter