›› Convert millihg to inch of mercury [0 °C]

inch of mercury

›› More information from the unit converter

How many millihg in 1 inch of mercury? The answer is 25.399999704976.
We assume you are converting between millihg and inch of mercury [0 °C].
You can view more details on each measurement unit:
millihg or inch of mercury
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.0075006156130264 millihg, or 0.00029529983071445 inch of mercury.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between millihg and inches of mercury.
Type in your own numbers in the form to convert the units!

›› Quick conversion chart of millihg to inch of mercury

1 millihg to inch of mercury = 0.03937 inch of mercury

10 millihg to inch of mercury = 0.3937 inch of mercury

20 millihg to inch of mercury = 0.7874 inch of mercury

30 millihg to inch of mercury = 1.1811 inch of mercury

40 millihg to inch of mercury = 1.5748 inch of mercury

50 millihg to inch of mercury = 1.9685 inch of mercury

100 millihg to inch of mercury = 3.93701 inch of mercury

200 millihg to inch of mercury = 7.87402 inch of mercury

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You can do the reverse unit conversion from inch of mercury to millihg, or enter any two units below:

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›› Common pressure conversions

millihg to terapascal
millihg to foot mercury
millihg to decipascal
millihg to torr
millihg to gigabar
millihg to meter of air
millihg to foot of head
millihg to kilogram-force/square millimeter
millihg to foot of water
millihg to centimeter mercury

›› Definition: Millihg

The SI prefix "milli" represents a factor of 10-3, or in exponential notation, 1E-3.

So 1 millihg = 10-3 hg.

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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