Convert pound/square inch to millimeter of water [4 °C]


pound/square inch
mmH2O

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)
mmH2O (relative to vacuum)



Did you mean to convert pound/square inch
pound/square inch [gauge]
pound/square inch [absolute]
 to mmH2O

More information from the unit converter

How many pound/square inch in 1 mmH2O? The answer is 0.0014223343334285. We assume you are converting between pound/square inch and millimeter of water [4 °C]. You can view more details on each measurement unit: pound/square inch or mmH2O The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00014503773800722 pound/square inch, or 0.10197162129779 mmH2O. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between pounds/square inch and millimeters of water. Type in your own numbers in the form to convert the units!



Quick conversion chart of pound/square inch to mmH2O

1 pound/square inch to mmH2O = 703.06958 mmH2O

2 pound/square inch to mmH2O = 1406.13916 mmH2O

3 pound/square inch to mmH2O = 2109.20873 mmH2O

4 pound/square inch to mmH2O = 2812.27831 mmH2O

5 pound/square inch to mmH2O = 3515.34789 mmH2O

6 pound/square inch to mmH2O = 4218.41747 mmH2O

7 pound/square inch to mmH2O = 4921.48705 mmH2O

8 pound/square inch to mmH2O = 5624.55663 mmH2O

9 pound/square inch to mmH2O = 6327.6262 mmH2O

10 pound/square inch to mmH2O = 7030.69578 mmH2O


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You can do the reverse unit conversion from mmH2O to pound/square inch, or enter any two units below:

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Common pressure conversions


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, 70 kg, 150 lbs, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!