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Pressure Altitude

This page can be used to translate pressure readings into altitude.  The table below indicates air pressure at elevations below and above sea level.

Air pressure above sea level can be calculated as

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

where

p = air pressure (Pa)

h = altitude above sea level (m)

Altitude Above Sea LevelAbsolute BarometerAbsolute Atmospheric Pressure
feetmeterinches Hgmm Hgpsiakg/cm2kPa
-5,000-1,52635.58903.717.481.229120.5
-4,500-1,37335.00889.017.191.209118.5
-4,000-1,22034.42874.316.91.188116.5
-3,500-1,06833.84859.516.621.169114.6
-3,000-91533.27845.116.341.149112.7
-2,500-76332.70830.616.061.129110.7
-2,000-61032.14816.415.781.109108.8
-1,500-45831.58802.115.511.091106.9
-1,000-30531.02787.915.231.071105.0
-500-15330.47773.914.961.052103.1
01)029.92760.014.6961.0333101.33
50015329.38746.314.431.01599.49
1,00030528.86733.014.160.99697.63
1,50045828.33719.613.910.97895.91
2,00061027.82706.613.660.96094.19
2,50076327.32693.913.410.94392.46
3,00091526.82681.213.170.92690.81
3,5001,06826.33668.812.930.90989.15
4,0001,22025.84656.312.690.89287.49
4,5001,37325.37644.412.460.87685.91
5,0001,52624.90632.512.230.8684.33
6,0001,83123.99609.311.780.82881.22
7,0002,13623.10586.711.340.79778.19
8,0002,44122.23564.610.910.76775.22
9,0002,74621.39543.310.50.73872.40
10,0003,05020.58522.710.10.7169.64
15,0004,57716.89429.08.290.58357.16
20,0006,10213.76349.56.760.47546.61
25,0007,62811.12282.45.460.38437.65
30,0009,1538.903226.14.370.30730.13
35,00010,6797.06179.33.470.24423.93
40,00012,2045.558141.22.730.19218.82
45,00013,7304.375111.12.150.15114.82
50,00015,2553.44487.51.690.11911.65
55,00016,7812.71268.91.330.0949.17
60,00018,3062.13554.21.050.0747.24
70,00021,3571.32533.70.650.0464.48
80,00024,4080.827321.00.410.0292.83
90,00027,4590.52013.20.260.0181.79
100,00030,5100.3298.360.160.0111.10

1) Sea Level