Altitude Units to Pressure Units Conversion

Convert here from an altitude in feet or metres above sea level to a pressure reading in millibar (mb or mbar), hectoPascals (hPa), pounds per square inch (psi), millimetres of mercury at zero degrees celsius (mmHg @ 0 deg C) or inches of mercury at zero degrees celsius ( inHg @ 0 deg C).

Altitude to Pressure Conversion Table

-5000	ft	-1524.0	m	convert to	1210.23	mb/hPa	17.553	psi	907.75	mmHg	35.738	inHg
-4000	ft	-1219.2	m	convert to	1168.55	mb/hPa	16.948	psi	876.48	mmHg	34.507	inHg
-3000	ft	-914.40	m	convert to	1128.03	mb/hPa	16.361	psi	846.09	mmHg	33.311	inHg
-2000	ft	-609.60	m	convert to	1088.66	mb/hPa	15.790	psi	816.56	mmHg	32.148	inHg
-1000	ft	-304.80	m	convert to	1050.41	mb/hPa	15.235	psi	787.87	mmHg	31.018	inHg
-900	ft	-274.32	m	convert to	1046.64	mb/hPa	15.180	psi	785.05	mmHg	30.907	inHg
-800	ft	-243.84	m	convert to	1042.89	mb/hPa	15.126	psi	782.23	mmHg	30.796	inHg
-700	ft	-213.36	m	convert to	1039.15	mb/hPa	15.072	psi	779.42	mmHg	30.686	inHg
-600	ft	-182.88	m	convert to	1035.41	mb/hPa	15.017	psi	776.62	mmHg	30.576	inHg
-500	ft	-152.40	m	convert to	1031.69	mb/hPa	14.963	psi	773.83	mmHg	30.466	inHg
-400	ft	-121.92	m	convert to	1027.98	mb/hPa	14.910	psi	771.05	mmHg	30.356	inHg
-300	ft	-91.440	m	convert to	1024.28	mb/hPa	14.856	psi	768.28	mmHg	30.247	inHg
-200	ft	-60.960	m	convert to	1020.59	mb/hPa	14.802	psi	765.51	mmHg	30.138	inHg
-100	ft	-30.480	m	convert to	1016.92	mb/hPa	14.749	psi	762.75	mmHg	30.030	inHg
-50	ft	-15.240	m	convert to	1015.08	mb/hPa	14.723	psi	761.37	mmHg	29.975	inHg
0	ft	0	m	convert to	1013.25	mb/hPa	14.696	psi	760.00	mmHg	29.921	inHg
50	ft	15.240	m	convert to	1011.42	mb/hPa	14.669	psi	758.63	mmHg	29.867	inHg
100	ft	30.480	m	convert to	1009.59	mb/hPa	14.643	psi	757.26	mmHg	29.813	inHg
200	ft	60.960	m	convert to	1005.95	mb/hPa	14.590	psi	754.52	mmHg	29.706	inHg
300	ft	91.440	m	convert to	1002.31	mb/hPa	14.537	psi	751.80	mmHg	29.598	inHg
400	ft	121.92	m	convert to	998.689	mb/hPa	14.485	psi	749.08	mmHg	29.491	inHg
500	ft	152.40	m	convert to	995.075	mb/hPa	14.432	psi	746.37	mmHg	29.385	inHg
600	ft	182.88	m	convert to	991.472	mb/hPa	14.380	psi	743.67	mmHg	29.278	inHg
700	ft	213.36	m	convert to	987.880	mb/hPa	14.328	psi	740.97	mmHg	29.172	inHg
800	ft	243.84	m	convert to	984.298	mb/hPa	14.276	psi	738.28	mmHg	29.066	inHg
900	ft	274.32	m	convert to	980.727	mb/hPa	14.224	psi	735.61	mmHg	28.961	inHg
1000	ft	304.80	m	convert to	977.166	mb/hPa	14.173	psi	732.93	mmHg	28.856	inHg
2000	ft	609.60	m	convert to	942.129	mb/hPa	13.664	psi	706.65	mmHg	27.821	inHg
3000	ft	914.40	m	convert to	908.117	mb/hPa	13.171	psi	681.14	mmHg	26.817	inHg
4000	ft	1219.2	m	convert to	875.105	mb/hPa	12.692	psi	656.38	mmHg	25.842	inHg
5000	ft	1524.0	m	convert to	843.073	mb/hPa	12.228	psi	632.36	mmHg	24.896	inHg
6000	ft	1828.8	m	convert to	811.996	mb/hPa	11.777	psi	609.05	mmHg	23.978	inHg
7000	ft	2133.6	m	convert to	781.854	mb/hPa	11.340	psi	586.44	mmHg	23.088	inHg
8000	ft	2438.4	m	convert to	752.624	mb/hPa	10.916	psi	564.51	mmHg	22.225	inHg
9000	ft	2743.2	m	convert to	724.285	mb/hPa	10.505	psi	543.26	mmHg	21.388	inHg
10000	ft	3048.0	m	convert to	696.817	mb/hPa	10.106	psi	522.66	mmHg	20.577	inHg
15000	ft	4572.0	m	convert to	571.820	mb/hPa	8.2935	psi	428.90	mmHg	16.886	inHg
20000	ft	6096.0	m	convert to	465.633	mb/hPa	6.7534	psi	349.25	mmHg	13.750	inHg
25000	ft	7620.0	m	convert to	376.009	mb/hPa	5.4536	psi	282.03	mmHg	11.104	inHg
30000	ft	9144.0	m	convert to	300.896	mb/hPa	4.3641	psi	225.69	mmHg	8.8855	inHg
35000	ft	10668	m	convert to	238.423	mb/hPa	3.4580	psi	178.83	mmHg	7.0406	inHg

The above height above sea level conversions to pressure units are derived using the US Standard Atmosphere 1976 barometric formula for geopotential altitude with the following physical constants and multi-valued (*) constants for sea level up to a height of 36,089 ft (11,000m)

1. *Standard atmospheric pressure of 1013.25 mb absolute at sea level
2. *Standard temperature of 288.15 K (15°C)
3. *Standard thermal gradient or lapse rate of -0.0065 K/km increase in altitude
4. Standard acceleration due to gravity of 9.80665 m/s2
5. Gas constant for air of 8.31432 J/Kmol K
6. Molar mass of air of0.0289644 kg/mole

Please note that the values above are not derived from absolutely precise values due to limitations of significant figures and decimal places and therefore should not be treated as exact values.

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Site Last Updated: 14/05/08

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