›› Convert to pound/square inch


millimeter mercury
pound/square inch

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.

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



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

›› More information from the unit converter

How many millimeter mercury in 1 pound/square inch? The answer is 51.714925105101.
We assume you are converting between and pound/square inch.
You can view more details on each measurement unit:
millimeter mercury or pound/square inch
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.0075006157584566 millimeter mercury, or 0.00014503773800722 pound/square inch.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between millimeters mercury and pounds/square inch.
Type in your own numbers in the form to convert the units!



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

1 millimeter mercury to pound/square inch = 0.01934 pound/square inch

10 millimeter mercury to pound/square inch = 0.19337 pound/square inch

20 millimeter mercury to pound/square inch = 0.38674 pound/square inch

30 millimeter mercury to pound/square inch = 0.5801 pound/square inch

40 millimeter mercury to pound/square inch = 0.77347 pound/square inch

50 millimeter mercury to pound/square inch = 0.96684 pound/square inch

100 millimeter mercury to pound/square inch = 1.93368 pound/square inch

200 millimeter mercury to pound/square inch = 3.86736 pound/square inch



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

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›› Common pressure conversions

millimeter mercury to ton/square foot
millimeter mercury to millihg
millimeter mercury to kilopascal
millimeter mercury to micron mercury
millimeter mercury to decibar
millimeter mercury to kilopond/square meter
millimeter mercury to kip/square inch
millimeter mercury to pieze
millimeter mercury to newton/square millimeter
millimeter mercury to kilonewton/square meter


›› Definition: Millimeter mercury

The millimeter of mercury by definition is 133.322387415 Pa (13.5951 g/cm3 × 9.80665 m/s2 × 1 mm), which is approximated with known accuracies of density of mercury and standard gravity.

The torr is defined as 1/760 of one standard atmosphere, while the atmosphere is defined as 101325 pascals. Therefore, 1 Torr is equal to
101325/760 Pa. The decimal form of this fraction is approximately 133.322368421.

The relationship between the torr and the millimeter of mercury is:

1 Torr = 0.999999857533699 mmHg
1 mmHg = 1.000000142466321 Torr

The difference between one millimeter of mercury and one torr, as well as between one atmosphere (101.325 kPa) and 760 mmHg (101.3250144354 kPa), is less than one part in seven million (or less than 0.000015%). This small difference is negligible for most applications outside metrology.


›› Definition: Pound/square inch

The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lbf/in²) 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.


›› 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!