How many inch of mercury in 1 millimeter of mercury?
The answer is 0.039370079197446.

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

You can view more details on each measurement unit:

inch of mercury or
millimeter of mercury

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

1 pascal is equal to 0.00029529983071445 inch of mercury, or 0.0075006156130264 millimeter of mercury.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between inches of mercury and millimeters of mercury.

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

1 inch of mercury to millimeter of mercury = 25.4 millimeter of mercury

2 inch of mercury to millimeter of mercury = 50.8 millimeter of mercury

3 inch of mercury to millimeter of mercury = 76.2 millimeter of mercury

4 inch of mercury to millimeter of mercury = 101.6 millimeter of mercury

5 inch of mercury to millimeter of mercury = 127 millimeter of mercury

6 inch of mercury to millimeter of mercury = 152.4 millimeter of mercury

7 inch of mercury to millimeter of mercury = 177.8 millimeter of mercury

8 inch of mercury to millimeter of mercury = 203.2 millimeter of mercury

9 inch of mercury to millimeter of mercury = 228.6 millimeter of mercury

10 inch of mercury to millimeter of mercury = 254 millimeter of mercury

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

inch of mercury to pascal

inch of mercury to kilobar

inch of mercury to newton/square millimeter

inch of mercury to zeptobar

inch of mercury to decipascal

inch of mercury to femtopascal

inch of mercury to dekabar

inch of mercury to exabar

inch of mercury to zeptopascal

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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

The torr (symbol: Torr) or millimetre of mercury (mmHg) is a non-SI unit of pressure. It is the atmospheric pressure that supports a column of mercury 1 millimetre high. The unit is named after Evangelista Torricelli, Italian physicist and mathematician, for his discovery of the principle of the barometer in 1643.

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