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How many in Hg in 1 atmosphere [standard]? The answer is 29.921252401895. We assume you are converting between inch mercury [0 °C] and atmosphere [standard]. You can view more details on each measurement unit: in Hg or atmosphere [standard] The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00029529980164712 in Hg, or 9.8692326671601E-6 atmosphere [standard]. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between inches mercury and atmospheres. Type in your own numbers in the form to convert the units!
1 in Hg to atmosphere [standard] = 0.03342 atmosphere [standard]
10 in Hg to atmosphere [standard] = 0.33421 atmosphere [standard]
20 in Hg to atmosphere [standard] = 0.66842 atmosphere [standard]
30 in Hg to atmosphere [standard] = 1.00263 atmosphere [standard]
40 in Hg to atmosphere [standard] = 1.33684 atmosphere [standard]
50 in Hg to atmosphere [standard] = 1.67105 atmosphere [standard]
100 in Hg to atmosphere [standard] = 3.34211 atmosphere [standard]
200 in Hg to atmosphere [standard] = 6.68421 atmosphere [standard]
You can do the reverse unit conversion from atmosphere [standard] to in 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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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.
The standard atmosphere (symbol: atm) is a unit of pressure defined as 101325 Pa (1.01325 bar). It is sometimes used as a reference pressure or standard pressure. It is approximately equal to Earth's atmospheric pressure at sea level.
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