Altitude Units to Pressure Units Conversion Table

Convert from an altitude in feet or metres above sea level to a pressure reading in millibar (mbar, mb or mbr), 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).

The height relative to sea level conversions 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/m 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 of 0.0289644 kg/mole

Please note that the calculated altitude values are not absolutely precise conversions and should not be treated as such.

Altitude to Pressure Conversion Table

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