How many inch of mercury in 1 milli-? The answer is 0.029921255347142. We assume you are converting between inch of mercury [0 °C] and milliatmosphere [standard]. You can view more details on each measurement unit: inch of mercury or milli- The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00029529983071445 inch of mercury, or 0.0098692326671601 milli-. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between inches of mercury and milliatmospheres. Type in your own numbers in the form to convert the units!
1 inch of mercury to milli- = 33.42106 milli-
2 inch of mercury to milli- = 66.84212 milli-
3 inch of mercury to milli- = 100.26317 milli-
4 inch of mercury to milli- = 133.68423 milli-
5 inch of mercury to milli- = 167.10529 milli-
6 inch of mercury to milli- = 200.52635 milli-
7 inch of mercury to milli- = 233.9474 milli-
8 inch of mercury to milli- = 267.36846 milli-
9 inch of mercury to milli- = 300.78952 milli-
10 inch of mercury to milli- = 334.21058 milli-
You can do the reverse unit conversion from milli- to inch of mercury, or enter any two units below:
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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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