Pressure To Altitude Conversion Chart

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Pressure to Altitude
Pressure
Pressure
Pressure
Pressure
Altitude
Altitude
(hPa)
(mmHg)
(inHg)
(atm)
(ft)
(m)
1013.25
760
29.92
1.000
0
0
1000
750
29.53
0.987
364
111
950
713
28.05
0.938
1773
540
900
675
26.58
0.888
3243
989
850
638
25.10
0.839
4781
1457
800
600
23.62
0.790
6394
1949
750
563
22.15
0.740
8091
2466
700
525
20.67
0.691
9882
3012
650
488
19.19
0.642
11780
3591
600
450
17.72
0.592
13801
4206
550
413
16.24
0.543
15962
4865
500
375
14.76
0.493
18289
5574
450
338
13.29
0.444
20812
6344
400
300
11.81
0.395
23574
7185
350
263
10.34
0.345
26631
8117
300
225
8.86
0.296
30065
9164
250
188
7.38
0.247
33999
10363
200
150
5.91
0.197
38632
11775
150
113
4.43
0.148
44321
13509
100
75
2.95
0.099
51828
15797
50
38
1.48
0.049
63395
19323
The Maths
Altitude = (10^(log(P/P_0)/5.2558797)-1/(-6.8755856*10^-6)
Where P = is atmospheric pressure at Altitude and
P_0 = the Sea Level pressure
Altitude is in feet
P & P_0 are unit independent and expressed as a ratio

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