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!

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

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

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

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

So 1 millihg = 10^{-3} hg.

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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