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atmosphere [standard] atmosphere [technical] |
to |
inch of mercury |

How many atmosphere [standard] in 1 inch of mercury?
The answer is 0.033421054354366.

We assume you are converting between **atmosphere [standard]** and **inch of mercury [0 °C]**.

You can view more details on each measurement unit:

atmosphere [standard] or
inch of mercury

The SI derived unit for **pressure** is the pascal.

1 pascal is equal to 9.8692316931427E-6 atmosphere [standard], 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 atmospheres and inches of mercury.

Type in your own numbers in the form to convert the units!

1 atmosphere [standard] to inch of mercury = 29.92126 inch of mercury

2 atmosphere [standard] to inch of mercury = 59.84252 inch of mercury

3 atmosphere [standard] to inch of mercury = 89.76377 inch of mercury

4 atmosphere [standard] to inch of mercury = 119.68503 inch of mercury

5 atmosphere [standard] to inch of mercury = 149.60629 inch of mercury

6 atmosphere [standard] to inch of mercury = 179.52755 inch of mercury

7 atmosphere [standard] to inch of mercury = 209.44881 inch of mercury

8 atmosphere [standard] to inch of mercury = 239.37007 inch of mercury

9 atmosphere [standard] to inch of mercury = 269.29132 inch of mercury

10 atmosphere [standard] to inch of mercury = 299.21258 inch of mercury

You can do the reverse unit conversion from inch of mercury to atmosphere [standard], or enter any two units below:

atmosphere [standard] to foot of head

atmosphere [standard] to kilogram/square centimeter

atmosphere [standard] to millimeter water

atmosphere [standard] to exapascal

atmosphere [standard] to barye

atmosphere [standard] to newton/square millimeter

atmosphere [standard] to centipascal

atmosphere [standard] to pound/square foot

atmosphere [standard] to zettapascal

atmosphere [standard] to micron of mercury

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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