How many millihg in 1 in Hg? The answer is 25.400002205181. We assume you are converting between millihg and inch mercury [0 °C]. You can view more details on each measurement unit: millihg or in Hg The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0075006156130264 millihg, or 0.00029529980164712 in Hg. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millihg and inches mercury. Type in your own numbers in the form to convert the units!
1 millihg to in Hg = 0.03937 in Hg
10 millihg to in Hg = 0.3937 in Hg
20 millihg to in Hg = 0.7874 in Hg
30 millihg to in Hg = 1.1811 in Hg
40 millihg to in Hg = 1.5748 in Hg
50 millihg to in Hg = 1.9685 in Hg
100 millihg to in Hg = 3.93701 in Hg
200 millihg to in Hg = 7.87402 in Hg
You can do the reverse unit conversion from in Hg to millihg, or enter any two units below:
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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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