How many millibar in 1 inch mercury?
The answer is 33.86389.

We assume you are converting between **millibar** and .

You can view more details on each measurement unit:

millibar or
inch mercury

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

1 pascal is equal to 0.01 millibar, 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 millibars and inches mercury.

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

1 millibar to inch mercury = 0.02953 inch mercury

10 millibar to inch mercury = 0.2953 inch mercury

20 millibar to inch mercury = 0.5906 inch mercury

30 millibar to inch mercury = 0.8859 inch mercury

40 millibar to inch mercury = 1.1812 inch mercury

50 millibar to inch mercury = 1.4765 inch mercury

100 millibar to inch mercury = 2.953 inch mercury

200 millibar to inch mercury = 5.906 inch mercury

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

millibar to zettabar

millibar to centimeter of mercury

millibar to ton/square foot

millibar to terapascal

millibar to gram/square centimeter

millibar to inch of mercury

millibar to ton/square meter

millibar to microbar

millibar to petabar

millibar to torr

A millibar (mb) is 1/1000th of a bar, a unit for measurement of pressure. It is not an SI unit of measure, however it is one of the units used in meteorology when describing atmospheric pressure. The SI unit is the pascal (Pa), with 1 millibar = 100 pascals (a hectopascal)

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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