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


inch mercury
millimeter of mercury


›› More information from the unit converter

How many inch mercury in 1 millimeter of mercury? The answer is 0.03937007532212.
We assume you are converting between and millimeter of mercury [0 °C].
You can view more details on each measurement unit:
inch mercury or millimeter of mercury
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529980164712 inch 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 mercury and millimeters of mercury.
Type in your own numbers in the form to convert the units!


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

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

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

3 inch mercury to millimeter of mercury = 76.20001 millimeter of mercury

4 inch mercury to millimeter of mercury = 101.60001 millimeter of mercury

5 inch mercury to millimeter of mercury = 127.00001 millimeter of mercury

6 inch mercury to millimeter of mercury = 152.40001 millimeter of mercury

7 inch mercury to millimeter of mercury = 177.80002 millimeter of mercury

8 inch mercury to millimeter of mercury = 203.20002 millimeter of mercury

9 inch mercury to millimeter of mercury = 228.60002 millimeter of mercury

10 inch mercury to millimeter of mercury = 254.00002 millimeter of mercury



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›› Common pressure conversions

inch mercury to atmosphere
inch mercury to petapascal
inch mercury to poundal/square foot
inch mercury to pieze
inch mercury to centipascal
inch mercury to kilopond/square meter
inch mercury to picopascal
inch mercury to millimeter of water
inch mercury to water column
inch mercury to kilogram/square centimeter


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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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