›› Convert inch of mercury [0 C] to millimeter of mercury [0 C]


inch of mercury
millimeter of mercury

›› More information from the unit converter

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!


›› Quick conversion chart of inch of mercury to millimeter of mercury

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


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

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›› Common pressure conversions

inch of mercury to millihg
inch of mercury to decitorr
inch of mercury to centimeter of water
inch of mercury to hectopascal
inch of mercury to attobar
inch of mercury to yottapascal
inch of mercury to millitorr
inch of mercury to megabar
inch of mercury to kilobar
inch of mercury to terapascal


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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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


›› Definition: Millimeter of mercury

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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ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 100 kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!