›› Convert inch of mercury [0 C] to atmosphere [standard]


Did you mean to convert inHg to atmosphere [standard]
atmosphere [technical]

›› More information from the unit converter

How many inHg in 1 atmosphere? 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:
inHg or atmosphere
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529983071445 inHg, or 9.8692316931427E-6 atmosphere.
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!

›› Quick conversion chart of inHg to atmosphere

1 inHg to atmosphere = 0.03342 atmosphere

10 inHg to atmosphere = 0.33421 atmosphere

20 inHg to atmosphere = 0.66842 atmosphere

30 inHg to atmosphere = 1.00263 atmosphere

40 inHg to atmosphere = 1.33684 atmosphere

50 inHg to atmosphere = 1.67105 atmosphere

100 inHg to atmosphere = 3.34211 atmosphere

200 inHg to atmosphere = 6.68421 atmosphere

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You can do the reverse unit conversion from atmosphere to inHg, or enter any two units below:

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›› Common pressure conversions

inHg to centibar
inHg to gigapascal
inHg to centihg
inHg to kilopond/square meter
inHg to meganewton/square meter
inHg to kilogram/square centimeter
inHg to yoctopascal
inHg to zeptopascal
inHg to nanobar
inHg to ounce/square inch

›› Definition: Inch 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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