How many cm Hg in 1 inch mercury? The answer is 2.5400002205181. We assume you are converting between centimeter mercury [0 °C] and inch mercury [0 °C]. You can view more details on each measurement unit: cm Hg or inch mercury The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00075006156130264 cm Hg, or 0.00029529980164712 inch mercury. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between centimeters mercury and inches mercury. Type in your own numbers in the form to convert the units!
1 cm Hg to inch mercury = 0.3937 inch mercury
5 cm Hg to inch mercury = 1.9685 inch mercury
10 cm Hg to inch mercury = 3.93701 inch mercury
20 cm Hg to inch mercury = 7.87402 inch mercury
30 cm Hg to inch mercury = 11.81102 inch mercury
40 cm Hg to inch mercury = 15.74803 inch mercury
50 cm Hg to inch mercury = 19.68504 inch mercury
75 cm Hg to inch mercury = 29.52756 inch mercury
100 cm Hg to inch mercury = 39.37008 inch mercury
You can do the reverse unit conversion from inch mercury to cm Hg, 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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