How many millihg in 1 inches 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 inches of mercury The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0075006156130264 millihg, or 0.00029529983071445 inches 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 inches of mercury = 0.03937 inches of mercury
10 millihg to inches of mercury = 0.3937 inches of mercury
20 millihg to inches of mercury = 0.7874 inches of mercury
30 millihg to inches of mercury = 1.1811 inches of mercury
40 millihg to inches of mercury = 1.5748 inches of mercury
50 millihg to inches of mercury = 1.9685 inches of mercury
100 millihg to inches of mercury = 3.93701 inches of mercury
200 millihg to inches of mercury = 7.87402 inches of mercury
You can do the reverse unit conversion from inches of mercury 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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