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
- 5-18 psi absolute RS485 output air pressure sensor for flow monitoring density correction use
- 700 to 1100 millibar scaled 4 to 20mA output pressure sensor for barometric pressure measurement
- Atmospheric range for 4-20mA pressure sensor
- 500-1100 mbar absolute range 0-5 volts output barometric pressure sensor
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
- High resolution, 1 bar absolute, 0-10 Vdc out pressure sensor
- Vacuum gauge to measure both absolute & negative gauge pressure
- 300 mmHg absolute vacuum pressure transducer with 10 volts output
- 15 psi absolute range RS485 Modbus RTU protocol interface vacuum sensor for research 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 & Atmospheric Pressure Gauges
- Marine approved atmospheric pressure sensor
- 5-18 psi absolute RS485 output air pressure sensor for flow monitoring density correction use
- 750-1250mb absolute range OEM barometric pressure transmitter