# Altitude above Sea Level and Air Pressure

## Elevation above sea level - in feet and meter - with barometric and atmospheric pressure - inches mercury, psia, kg/cm2 and kPa

Air pressure above sea level can be calculated as

p = 101325 (1 - 2.25577 10-5 h)5.25588                           (1)

where

101325 = normal temperature and pressure at sea level (Pa)

p = air pressure (Pa)

h = altitude above sea level (m)

### Example - Air pressure at Elevation 10000 m

The air pressure at altitude 10000 m can be calculated as

p = 101325 (1 - 2.25577 10-5 (10000 m))5.25588

= 26436 Pa

= 26.4 kPa

The table below indicates air pressure at elevations below and above sea level.

Altitude Above Sea LevelAbsolute BarometerAbsolute Atmospheric Pressure
feetmetersinches Hgmm Hgpsiakg/cm2kPa
-5000 -1524 35.7 908 17.5 1.23 121
-4500
aprox. deepest point under sea level of Sognefjorden, Norway
-1372 35.1 892 17.2 1.21 119
-4000 -1219 34.5 876 16.9 1.19 117
-3500 -1067 33.9 861 16.6 1.17 115
-3000 -914 33.3 846 16.4 1.15 113
-2500 -762 32.7 831 16.1 1.13 111
-2000 -610 32.1 816 15.8 1.11 109
-1500
shore of the Dead Sea, Palestine, Israel and Jordan (-1371 ft)
-457 31.6 802 15.5 1.09 107
-1000 -305 31.0 788 15.2 1.07 105
-500 -152 30.5 774 15.0 1.05 103
01) 0 29.9 760 14.7 1.03 101
500
aprox. Møllehøj, Denmark
152 29.4 746 14.4 1.01 99.5
1000 305 28.9 733 14.2 0.997 97.7
1500 457 28.3 720 13.9 0.979 96.0
2000 610 27.8 707 13.7 0.961 94.2
2500 762 27.3 694 13.4 0.943 92.5
3000 914 26.8 681 13.2 0.926 90.8
3500 1067 26.3 669 12.9 0.909 89.1
4000 1219 25.8 656 12.7 0.893 87.5
4500
aprox. Ben Nevis, Scotland, UK
1372 25.4 644 12.5 0.876 85.9
5000 1524 24.9 632 12.2 0.860 84.3
6000 1829 24.0 609 11.8 0.828 81.2
7000 2134 23.1 586 11.3 0.797 78.2
8000 2438 22.2 564 10.9 0.768 75.3
9000 2743 21.4 543 10.5 0.739 72.4
10000 3048 20.6 523 10.1 0.711 69.7
15000 4572 16.9 429 8.29 0.583 57.2
20000
6096 13.8 349 6.75 0.475 46.6
25000 7620 11.1 282 5.45 0.384 37.6
30000
aprox. Mount Everest, Nepal - Tibet
9144 8.89 226 4.36 0.307 30.1
35000 10668 7.04 179 3.46 0.243 23.8
40000 12192 5.52 140 2.71 0.191 18.7
45000 13716 4.28 109 2.10 0.148 14.5
50000 15240 3.27 83 1.61 0.113 11.1

1) Sea Level

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