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


pound/square inch
millimeters water

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)
millimeters water (relative to vacuum)



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

More information from the unit converter

How many pound/square inch in 1 millimeters water? The answer is 0.0014223343334285. We assume you are converting between pound/square inch and millimeter water [4 °C]. You can view more details on each measurement unit: pound/square inch or millimeters water The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00014503773800722 pound/square inch, or 0.10197162129779 millimeters water. 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 water. Type in your own numbers in the form to convert the units!



Quick conversion chart of pound/square inch to millimeters water

1 pound/square inch to millimeters water = 703.06958 millimeters water

2 pound/square inch to millimeters water = 1406.13916 millimeters water

3 pound/square inch to millimeters water = 2109.20873 millimeters water

4 pound/square inch to millimeters water = 2812.27831 millimeters water

5 pound/square inch to millimeters water = 3515.34789 millimeters water

6 pound/square inch to millimeters water = 4218.41747 millimeters water

7 pound/square inch to millimeters water = 4921.48705 millimeters water

8 pound/square inch to millimeters water = 5624.55663 millimeters water

9 pound/square inch to millimeters water = 6327.6262 millimeters water

10 pound/square inch to millimeters water = 7030.69578 millimeters water


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You can do the reverse unit conversion from millimeters water 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!