›› Convert inch of water column to inch mercury [0 C]

inch water column
in Hg



›› More information from the unit converter

How many inch water column in 1 in Hg? The answer is 13.5951001967.
We assume you are converting between inch of water column and inch mercury [0 C].
You can view more details on each measurement unit:
inch water column or in Hg
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00401463078662 inch water column, or 0.000295299830714 in Hg.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches water column and inches mercury.
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›› Definition: Inch 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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