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How many inch of mercury in 1 atmosphere [standard]?
The answer is 29.92125830014.
We assume you are converting between inch of mercury [0 °C] and atmosphere [standard].
You can view more details on each measurement unit:
inch of mercury or atmosphere [standard]
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529983071445 inch of mercury, or 9.8692316931427E-6 atmosphere [standard].
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches of mercury and atmospheres.
Type in your own numbers in the form to convert the units!
1 inch of mercury to atmosphere [standard] = 0.03342 atmosphere [standard]
10 inch of mercury to atmosphere [standard] = 0.33421 atmosphere [standard]
20 inch of mercury to atmosphere [standard] = 0.66842 atmosphere [standard]
30 inch of mercury to atmosphere [standard] = 1.00263 atmosphere [standard]
40 inch of mercury to atmosphere [standard] = 1.33684 atmosphere [standard]
50 inch of mercury to atmosphere [standard] = 1.67105 atmosphere [standard]
100 inch of mercury to atmosphere [standard] = 3.34211 atmosphere [standard]
200 inch of mercury to atmosphere [standard] = 6.68421 atmosphere [standard]
You can do the reverse unit conversion from atmosphere [standard] to inch of mercury, or enter any two units below:
inch of mercury to foot of head
inch of mercury to petapascal
inch of mercury to sthene/square meter
inch of mercury to torr
inch of mercury to kilogram-force/square meter
inch of mercury to barad
inch of mercury to decibar
inch of mercury to kilogram-force/square millimeter
inch of mercury to gigabar
inch of mercury to micron of mercury
Inches of mercury or inHg is a non-SI unit for pressure. It is still widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.
It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity.
1 inHg = 3,386.389 pascals at 0 °C.
Aircraft operating at higher altitudes (above 18,000 feet) set their barometric altimeters to a standard pressure of 29.92 inHg or 1,013.2 hPa (1 hPa = 1 mbar) regardless of the actual sea level pressure, with inches of mercury used in the U.S. and Canada. The resulting altimeter readings are known as flight levels.
Piston engine aircraft with constant-speed propellers also use inHg to measure manifold pressure, which is indicative of engine power produced.
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