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).
Featured atmospheric pressure measurement products
800 to 1200 mbar atmospheric pressure transmitter - Reliable barometric pressure sensor for OEM applications requiring atmospheric pressure compensation in scientific and process instrumentation.
Barometric & Atmospheric Pressure Gauges - Barometric pressure gauges with ranges up to 2 bar absolute, vital for industrial verification, environmental monitoring, and compensating measurements like humidity, air density, and airflow.
| 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 |
Featured vacuum range absolute pressure measurement products
Baroli 02 Precision Digital Pressure Gauge - Precision digital pressure gauge with ranges from 100 mbar (1.5 psi) up to 600 bar (9000 psi) for measuring to an accuracy of 0.125% FS BSL.
DMP331P Hygienic Flush Pressure Transmitter - Sanitary pressure sensor wth exposed diaphragm with no crevices for high temperatures up to 300 Degrees Celsius in ranges from 100mb up to 40 bar gauge or absolute
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.
Featured atmospheric pressure measurement products
Barometric pressure sensor for hurricane tracking on uncrewed surface vessel - Barometric pressure measurement in harsh marine environments. This application required a corrosion-resistant, IP67-rated pressure sensor for an uncrewed surface vessel used in hurricane research, capable of withstanding saltwater spray and high humidity.
Non-vented submersible absolute range pressure and barometric sensor for measuring 10m water level - Learn how to use a non-vented submersible sensor with a barometric pressure sensor for accurate water level measurement in challenging installations.