How many inch of mercury in 1 millihg?
The answer is 0.039370079197446.

We assume you are converting between **inch of mercury [0 °C]** and **millihg**.

You can view more details on each measurement unit:

inch of mercury or
millihg

The SI derived unit for **pressure** is the pascal.

1 pascal is equal to 0.00029529983071445 inch of mercury, or 0.0075006156130264 millihg.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between inches of mercury and millihg.

Type in your own numbers in the form to convert the units!

1 inch of mercury to millihg = 25.4 millihg

2 inch of mercury to millihg = 50.8 millihg

3 inch of mercury to millihg = 76.2 millihg

4 inch of mercury to millihg = 101.6 millihg

5 inch of mercury to millihg = 127 millihg

6 inch of mercury to millihg = 152.4 millihg

7 inch of mercury to millihg = 177.8 millihg

8 inch of mercury to millihg = 203.2 millihg

9 inch of mercury to millihg = 228.6 millihg

10 inch of mercury to millihg = 254 millihg

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

inch of mercury to centihg

inch of mercury to picobar

inch of mercury to sthene/square meter

inch of mercury to atmosphere

inch of mercury to newton/square meter

inch of mercury to zettabar

inch of mercury to exabar

inch of mercury to femtobar

inch of mercury to torr

inch of mercury to foot of water

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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

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

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

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