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


pound/square inch [gauge]
mmH2O

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.

pound/square inch [gauge] (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 [gauge] in 1 mmH2O? The answer is 0.0014223343334285. We assume you are converting between pound/square inch [gauge] and millimeter of water [4 °C]. You can view more details on each measurement unit: pound/square inch [gauge] or mmH2O The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00014503773800722 pound/square inch [gauge], 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 [gauge] to mmH2O

1 pound/square inch [gauge] to mmH2O = 703.06958 mmH2O

2 pound/square inch [gauge] to mmH2O = 1406.13916 mmH2O

3 pound/square inch [gauge] to mmH2O = 2109.20873 mmH2O

4 pound/square inch [gauge] to mmH2O = 2812.27831 mmH2O

5 pound/square inch [gauge] to mmH2O = 3515.34789 mmH2O

6 pound/square inch [gauge] to mmH2O = 4218.41747 mmH2O

7 pound/square inch [gauge] to mmH2O = 4921.48705 mmH2O

8 pound/square inch [gauge] to mmH2O = 5624.55663 mmH2O

9 pound/square inch [gauge] to mmH2O = 6327.6262 mmH2O

10 pound/square inch [gauge] to mmH2O = 7030.69578 mmH2O


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

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Common pressure conversions


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.


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!