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


millimeter of water
psig

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.

millimeter of water (relative to vacuum)
psig (relative to atmosphere)



More information from the unit converter

How many millimeter of water in 1 psig? The answer is 703.06957829636. We assume you are converting between millimeter of water [4 °C] and pound/square inch [gauge]. You can view more details on each measurement unit: millimeter of water or psig The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.10197162129779 millimeter of water, or 0.00014503773800722 psig. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millimeters of water and pounds/square inch. Type in your own numbers in the form to convert the units!



Quick conversion chart of millimeter of water to psig

1 millimeter of water to psig = 0.00142 psig

10 millimeter of water to psig = 0.01422 psig

50 millimeter of water to psig = 0.07112 psig

100 millimeter of water to psig = 0.14223 psig

200 millimeter of water to psig = 0.28447 psig

500 millimeter of water to psig = 0.71117 psig

1000 millimeter of water to psig = 1.42233 psig


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You can do the reverse unit conversion from psig to millimeter of water, 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!