How many psi in 1 mmH2O?
The answer is 0.00142233433343.

We assume you are converting between **pound/square inch** and **millimeter of water [4 °C]**.

You can view more details on each measurement unit:

psi or
mmH2O

The SI derived unit for **pressure** is the pascal.

1 pascal is equal to 0.000145037738007 psi, or 0.101971621298 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.

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You can do the reverse unit conversion from mmH2O to psi, or enter any two units below:

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The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/inē or lbf/inē) 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.

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