How many hPa in 1 inch of mercury?
The answer is 33.863886666667.

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

You can view more details on each measurement unit:

hPa or
inch of mercury

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

1 pascal is equal to 0.01 hPa, 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 hectopascals and inches of mercury.

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

1 hPa to inch of mercury = 0.02953 inch of mercury

10 hPa to inch of mercury = 0.2953 inch of mercury

20 hPa to inch of mercury = 0.5906 inch of mercury

30 hPa to inch of mercury = 0.8859 inch of mercury

40 hPa to inch of mercury = 1.1812 inch of mercury

50 hPa to inch of mercury = 1.4765 inch of mercury

100 hPa to inch of mercury = 2.953 inch of mercury

200 hPa to inch of mercury = 5.906 inch of mercury

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

hPa to sthene/square meter

hPa to yoctopascal

hPa to newton/square meter

hPa to dyne/square centimeter

hPa to femtobar

hPa to kilogram-force/square meter

hPa to centimeter mercury

hPa to zettapascal

hPa to meter of air

hPa to micrometer of water

The SI prefix "hecto" represents a factor of
10^{2}, or in exponential notation, 1E2.

So 1 hectopascal = 10^{2} pascals.

The definition of a pascal is as follows:

The pascal (symbol Pa) is the SI unit of pressure.It is equivalent to one newton per square metre. The unit is named after Blaise Pascal, the eminent French mathematician, physicist and philosopher.

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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