›› Convert inch of mercury [0 C] to pound/square inch [gauge]

inch of mercury
pounds per square inch

The above form works if you are measuring differential pressure, such as the difference in psi between two points.

If you are measuring relative to vacuum and want to resolve the pressure relative to the atmosphere, then you should use the form below.

Note that psig can measure differential pressure in some applications and absolute pressure in others, so you need to know which one fits your calculation.

inch of mercury (relative to vacuum)
pounds per square inch (relative to atmosphere)

Did you mean to convert inch of mercury to pound/square inch
pound/square inch [gauge]
pound/square inch [absolute]


›› More information from the unit converter

How many inch of mercury in 1 pounds per square inch? The answer is 2.0360206576.
We assume you are converting between inch of mercury [0 C] and pound/square inch [gauge].
You can view more details on each measurement unit:
inch of mercury or pounds per square inch
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.000295299830714 inch of mercury, or 0.000145037738007 pounds per square inch.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches of mercury and pounds/square inch.
Type in your own numbers in the form to convert the units!


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

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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

Psig (pound-force per square inch gauge) is a unit of pressure relative to the surrounding atmosphere. By contrast, psia measures pressure relative to a vacuum (such as that in space). At sea level, Earth's atmosphere actually exerts a pressure of 14.7 psi. Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure. If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.7 psi. Thus a reading of 30 psig on a tire gauge represents an absolute pressure of 44.7 psi.


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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!

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