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


inch of water
pound/square inch

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.

inch of water (relative to vacuum)
pound/square inch (relative to atmosphere)



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

›› More information from the unit converter

How many inch of water in 1 pound/square inch? The answer is 27.679904842545.
We assume you are converting between inch of water [4 °C] and pound/square inch.
You can view more details on each measurement unit:
inch of water or pound/square inch
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.0040146307866177 inch of water, or 0.00014503773800722 pound/square inch.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches of water and pounds/square inch.
Type in your own numbers in the form to convert the units!



›› Quick conversion chart of inch of water to pound/square inch

1 inch of water to pound/square inch = 0.03613 pound/square inch

10 inch of water to pound/square inch = 0.36127 pound/square inch

20 inch of water to pound/square inch = 0.72255 pound/square inch

30 inch of water to pound/square inch = 1.08382 pound/square inch

40 inch of water to pound/square inch = 1.44509 pound/square inch

50 inch of water to pound/square inch = 1.80636 pound/square inch

100 inch of water to pound/square inch = 3.61273 pound/square inch

200 inch of water to pound/square inch = 7.22546 pound/square inch



›› Want other units?

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

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›› Common pressure conversions

inch of water to millipascal
inch of water to millimeter mercury
inch of water to kilobar
inch of water to millimeter of water
inch of water to millimeter of mercury
inch of water to inch mercury
inch of water to pieze
inch of water to dekapascal
inch of water to yottapascal
inch of water to inch water


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