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


pound/square inch
inch of mercury

The above form works if you are measuring differential pressure, such as the difference in psi between two points. It also gives the correct answer for absolute pressure, assuming you are measuring psia, which is the pressure relative to absolute zero vacuum.

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

pound/square inch (relative to atmosphere)
inch of mercury (relative to vacuum)

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

›› More information from the unit converter

How many pound/square inch in 1 inch of mercury? The answer is 0.49115415222661.
We assume you are converting between pound/square inch and inch of mercury [0 C].
You can view more details on each measurement unit:
pound/square inch or inch of mercury
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00014503773800722 pound/square inch, 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 pounds/square inch and inches of mercury.
Type in your own numbers in the form to convert the units!


›› Quick conversion chart of pound/square inch to inch of mercury

1 pound/square inch to inch of mercury = 2.03602 inch of mercury

5 pound/square inch to inch of mercury = 10.1801 inch of mercury

10 pound/square inch to inch of mercury = 20.36021 inch of mercury

15 pound/square inch to inch of mercury = 30.54031 inch of mercury

20 pound/square inch to inch of mercury = 40.72041 inch of mercury

25 pound/square inch to inch of mercury = 50.90052 inch of mercury

30 pound/square inch to inch of mercury = 61.08062 inch of mercury

40 pound/square inch to inch of mercury = 81.44083 inch of mercury

50 pound/square inch to inch of mercury = 101.80103 inch of mercury


›› Want other units?

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

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›› Common pressure conversions

pound/square inch to attobar
pound/square inch to inch of air
pound/square inch to yottabar
pound/square inch to gigabar
pound/square inch to centimeter mercury
pound/square inch to kilopond/square centimeter
pound/square inch to meganewton/square meter
pound/square inch to micropascal
pound/square inch to attopascal
pound/square inch to ton/square foot


›› Definition: Pound/square inch

The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in or lbf/in) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch.


›› 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.


›› Metric conversions and more

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!