›› Convert millimeter water [4 C] to inch of water column


mm H2O
inch water column


›› More information from the unit converter

How many mm H2O in 1 inch water column? The answer is 25.399999830047.
We assume you are converting between millimeter water [4 C] and inch of water column.
You can view more details on each measurement unit:
mm H2O or inch water column
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.10197162129779 mm H2O, or 0.0040146307866177 inch water column.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between millimeters water and inches water column.
Type in your own numbers in the form to convert the units!


›› Quick conversion chart of mm H2O to inch water column

1 mm H2O to inch water column = 0.03937 inch water column

10 mm H2O to inch water column = 0.3937 inch water column

20 mm H2O to inch water column = 0.7874 inch water column

30 mm H2O to inch water column = 1.1811 inch water column

40 mm H2O to inch water column = 1.5748 inch water column

50 mm H2O to inch water column = 1.9685 inch water column

100 mm H2O to inch water column = 3.93701 inch water column

200 mm H2O to inch water column = 7.87402 inch water column



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You can do the reverse unit conversion from inch water column to mm H2O, or enter any two units below:

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›› Common pressure conversions

mm H2O to attobar
mm H2O to kip/square inch
mm H2O to kilopascal
mm H2O to inch mercury
mm H2O to kilopond/square meter
mm H2O to centihg
mm H2O to pascal
mm H2O to petapascal
mm H2O to microbar
mm H2O to picobar


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