How many water column [millimeter] in 1 pound/square inch [gauge]?
The answer is 703.069578296.

We assume you are converting between **water column [millimeter]** and **pound/square inch [gauge]**.

You can view more details on each measurement unit:

water column [millimeter] or
pound/square inch [gauge]

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

1 pascal is equal to 0.101971621298 water column [millimeter], or 0.000145037738007 pound/square inch [gauge].

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between water column and pounds/square inch.

Type in your own numbers in the form to convert the units!

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.

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