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Air Pressure and Altitude above Sea Level

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

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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)

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

Altitude Above Sea Level		Absolute Barometer		Absolute Atmospheric Pressure
feet	meters	inches Hg	mm Hg	psia	kg/cm²	kPa
-5000	-1524	35.7	914	17.5	1.23	121
-4500	-1372	35.1	898	17.2	1.21	119
-4000	-1219	34.5	882	16.9	1.19	117
-3500	-1067	33.9	867	16.6	1.17	115
-3000	-914	33.3	852	16.4	1.15	113
-2500	-762	32.7	837	16.1	1.13	111
-2000	-610	32.1	822	15.8	1.11	109
-1500	-457	31.6	807	15.5	1.09	107
-1000	-305	31.0	793	15.2	1.07	105
-500	-152	30.5	779	15.0	1.05	103
0¹⁾	0	29.9	765	14.7	1.03	101
500	152	29.4	751	14.4	1.01	99.5
1000	305	28.9	738	14.2	0.997	97.7
1500	457	28.3	724	13.9	0.979	96.0
2000	610	27.8	711	13.7	0.961	94.2
2500	762	27.3	698	13.4	0.943	92.5
3000	914	26.8	686	13.2	0.926	90.8
3500	1067	26.3	673	12.9	0.909	89.1
4000	1219	25.8	661	12.7	0.893	87.5
4500	1372	25.4	649	12.5	0.876	85.9
5000	1524	24.9	637	12.2	0.860	84.3
6000	1829	24.0	613	11.8	0.828	81.2
7000	2134	23.1	590	11.3	0.797	78.2
8000	2438	22.2	568	10.9	0.768	75.3
9000	2743	21.4	547	10.5	0.739	72.4
10000	3048	20.6	526	10.1	0.711	69.7
15000	4572	16.9	432	8.29	0.583	57.2
20000	6096	13.8	352	6.75	0.475	46.6
25000	7620	11.1	284	5.45	0.384	37.6
30000	9144	8.89	227	4.36	0.307	30.1
35000	10668	7.04	180	3.46	0.243	23.8
40000	12192	5.52	141	2.71	0.191	18.7
45000	13716	4.28	109	2.10	0.148	14.5
50000	15240	3.27	83.6	1.61	0.113	11.1

¹⁾ Sea Level

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