›› Convert to inch of mercury [0 C]


inch mercury
inch of mercury

›› More information from the unit converter

How many inch mercury in 1 inch of mercury? The answer is 0.99999990156673.
We assume you are converting between and inch of mercury [0 C].
You can view more details on each measurement unit:
inch mercury or inch of mercury
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529980164712 inch mercury, 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 inches mercury and inches of mercury.
Type in your own numbers in the form to convert the units!


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

1 inch mercury to inch of mercury = 1 inch of mercury

5 inch mercury to inch of mercury = 5 inch of mercury

10 inch mercury to inch of mercury = 10 inch of mercury

15 inch mercury to inch of mercury = 15 inch of mercury

20 inch mercury to inch of mercury = 20 inch of mercury

25 inch mercury to inch of mercury = 25 inch of mercury

30 inch mercury to inch of mercury = 30 inch of mercury

40 inch mercury to inch of mercury = 40 inch of mercury

50 inch mercury to inch of mercury = 50 inch of mercury


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

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›› Common pressure conversions

inch mercury to kilogram-force/square millimeter
inch mercury to millimeter mercury
inch mercury to millitorr
inch mercury to zettabar
inch mercury to petabar
inch mercury to foot water
inch mercury to atmosphere
inch mercury to pound/square inch
inch mercury to yottabar
inch mercury to foot of mercury


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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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


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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!