The table below indicates air pressure at elevations below and above sea level.
Altitude Above Sea Level
Absolute Barometer
Absolute Atmospheric Pressure
feet
meter
inches Hg
mm Hg
psia
kg/cm2
kPa
-3,000
-915
33.27
845.1
16.34
1.149
112.7
-2,500
-763
32.70
830.6
16.06
1.129
110.7
-2,000
-610
32.14
816.4
15.78
1.109
108.8
-1,500
-458
31.58
802.1
15.51
1.091
106.9
-1,000
-305
31.02
787.9
15.23
1.071
105.0
-500
-153
30.47
773.9
14.96
1.052
103.1
0
0
29.92
760.0
14.696
1.0333
101.33
500
153
29.38
746.3
14.43
1.015
99.49
1,000
305
28.86
733.0
14.16
0.996
97.63
1,500
458
28.33
719.6
13.91
0.978
95.91
2,000
610
27.82
706.6
13.66
0.960
94.19
2,500
763
27.32
693.9
13.41
0.943
92.46
3,000
915
26.82
681.2
13.17
0.926
90.81
3,500
1,068
26.33
668.8
12.93
0.909
89.15
4,000
1,220
25.84
656.3
12.69
0.892
87.49
4,500
1,373
25.37
644.4
12.46
0.876
85.91
5,000
1,526
24.90
632.5
12.23
0.86
84.33
6,000
1,831
23.99
609.3
11.78
0.828
81.22
7,000
2,136
23.10
586.7
11.34
0.797
78.19
8,000
2,441
22.23
564.6
10.91
0.767
75.22
9,000
2,746
21.39
543.3
10.5
0.738
72.40
10,000
3,050
20.58
522.7
10.1
0.71
69.64
15,000
4,577
16.89
429.0
8.29
0.583
57.16
20,000
6,102
13.76
349.5
6.76
0.475
46.61
25,000
7,628
11.12
282.4
5.46
0.384
37.65
30,000
9,153
8.903
226.1
4.37
0.307
30.13
35,000
10,679
7.06
179.3
3.47
0.244
23.93
40,000
12,204
5.558
141.2
2.73
0.192
18.82
45,000
13,730
4.375
111.1
2.15
0.151
14.82
50,000
15,255
3.444
87.5
1.69
0.119
11.65
55,000
16,781
2.712
68.9
1.33
0.094
9.17
60,000
18,306
2.135
54.2
1.05
0.074
7.24
70,000
21,357
1.325
33.7
0.65
0.046
4.48
80,000
24,408
0.8273
21.0
0.41
0.029
2.83
90,000
27,459
0.520
13.2
0.26
0.018
1.79
100,000
30,510
0.329
8.36
0.16
0.011
1.10
