How many inch mercury in 1 inH2O? The answer is 0.073555905223332. We assume you are converting between inch mercury [0 °C] and inch of water [4 °C]. You can view more details on each measurement unit: inch mercury or inH2O The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00029529980164712 inch mercury, or 0.0040146307866177 inH2O. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between inches mercury and inches of water. Type in your own numbers in the form to convert the units!
1 inch mercury to inH2O = 13.5951 inH2O
2 inch mercury to inH2O = 27.1902 inH2O
3 inch mercury to inH2O = 40.7853 inH2O
4 inch mercury to inH2O = 54.38041 inH2O
5 inch mercury to inH2O = 67.97551 inH2O
6 inch mercury to inH2O = 81.57061 inH2O
7 inch mercury to inH2O = 95.16571 inH2O
8 inch mercury to inH2O = 108.76081 inH2O
9 inch mercury to inH2O = 122.35591 inH2O
10 inch mercury to inH2O = 135.95102 inH2O
You can do the reverse unit conversion from inH2O to inch 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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