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


pounds per square inch
inch H2O

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.

pounds per square inch (relative to atmosphere)
inch H2O (relative to vacuum)



Did you mean to convert pound/square inch
pound/square inch [gauge]
pound/square inch [absolute]
 to inch H2O

More information from the unit converter

How many pounds per square inch in 1 inch H2O? The answer is 0.036127291827354. We assume you are converting between pound/square inch and inch water [4 °C]. You can view more details on each measurement unit: pounds per square inch or inch H2O The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00014503773800722 pounds per square inch, or 0.0040146307866177 inch H2O. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between pounds/square inch and inches water. Type in your own numbers in the form to convert the units!



Quick conversion chart of pounds per square inch to inch H2O

1 pounds per square inch to inch H2O = 27.6799 inch H2O

2 pounds per square inch to inch H2O = 55.35981 inch H2O

3 pounds per square inch to inch H2O = 83.03971 inch H2O

4 pounds per square inch to inch H2O = 110.71962 inch H2O

5 pounds per square inch to inch H2O = 138.39952 inch H2O

6 pounds per square inch to inch H2O = 166.07943 inch H2O

7 pounds per square inch to inch H2O = 193.75933 inch H2O

8 pounds per square inch to inch H2O = 221.43924 inch H2O

9 pounds per square inch to inch H2O = 249.11914 inch H2O

10 pounds per square inch to inch H2O = 276.79905 inch H2O


Want other units?

You can do the reverse unit conversion from inch H2O to pounds per 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!