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
IMPLR Low Range All Stainless Steel OEM Pressure Sensor - Low cost sensor for measuring small pressure ranges from 0-50 mbar (10 inH2O) to 0-1000 mbar (15 psi) of liquids or gases.
Ex rated ambient pressure sensor with 800-1100 mbar range - Could you give details of a high accuracy pressure sensor which measures ambient pressure (800 to 1100 mb) for environmental purposes.
| 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
PGS40 Mid Pressure Calibration Hand Pump - PGS40 pneumatic hand pump for applying test and calibration pressures with precision from -0.96 up to 40 bar gauge. 
760mmHg absolute range digital vacuum gauge - Digital vacuum gauge for measuring over the 0 to 760mmHg (millimetres of Mercury) absolute pressure range.
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
33X High Accuracy Digital Output Pressure Sensor - High precision pressure transducer with an accuracy of 0.05% full scale with a RS485, USB or RS232 digital interface for connecting to a PC.
LEX1 (Ei) High Accuracy Digital Pressure Gauge - High precision digital pressure gauge with an accuracy of 0.05% full scale in pressure ranges from 0...30 mbar up to 0...1000 bar.