How many mm H2O in 1 inches of water? The answer is 25.399999830047. We assume you are converting between millimeter water [4 °C] and inch of water [4 °C]. You can view more details on each measurement unit: mm H2O or inches of water The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.10197162129779 mm H2O, or 0.0040146307866177 inches of water. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millimeters water and inches of water. Type in your own numbers in the form to convert the units!
1 mm H2O to inches of water = 0.03937 inches of water
10 mm H2O to inches of water = 0.3937 inches of water
20 mm H2O to inches of water = 0.7874 inches of water
30 mm H2O to inches of water = 1.1811 inches of water
40 mm H2O to inches of water = 1.5748 inches of water
50 mm H2O to inches of water = 1.9685 inches of water
100 mm H2O to inches of water = 3.93701 inches of water
200 mm H2O to inches of water = 7.87402 inches of water
You can do the reverse unit conversion from inches of water to mm H2O, or enter any two units below:
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