How many milli- in 1 inch of mercury? The answer is 33.421057652767. We assume you are converting between milliatmosphere [standard] and inch of mercury [0 °C]. You can view more details on each measurement unit: milli- or inch of mercury The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0098692326671601 milli-, 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 milliatmospheres and inches of mercury. Type in your own numbers in the form to convert the units!
1 milli- to inch of mercury = 0.02992 inch of mercury
10 milli- to inch of mercury = 0.29921 inch of mercury
20 milli- to inch of mercury = 0.59843 inch of mercury
30 milli- to inch of mercury = 0.89764 inch of mercury
40 milli- to inch of mercury = 1.19685 inch of mercury
50 milli- to inch of mercury = 1.49606 inch of mercury
100 milli- to inch of mercury = 2.99213 inch of mercury
200 milli- to inch of mercury = 5.98425 inch of mercury
You can do the reverse unit conversion from inch of mercury to milli-, 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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.
ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 70 kg, 150 lbs, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!