How many mm H2O in 1 inch water?
The answer is 25.399999830047.
We assume you are converting between millimeter water [4 °C] and inch water [4 °C].
You can view more details on each measurement unit:
mm H2O or
inch water
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.10197162129779 mm H2O, or 0.0040146307866177 inch 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 water.
Type in your own numbers in the form to convert the units!
1 mm H2O to inch water = 0.03937 inch water
10 mm H2O to inch water = 0.3937 inch water
20 mm H2O to inch water = 0.7874 inch water
30 mm H2O to inch water = 1.1811 inch water
40 mm H2O to inch water = 1.5748 inch water
50 mm H2O to inch water = 1.9685 inch water
100 mm H2O to inch water = 3.93701 inch water
200 mm H2O to inch water = 7.87402 inch water
You can do the reverse unit conversion from inch water to mm H2O, or enter any two units below:
mm H2O to centimeter of mercury
mm H2O to dekapascal
mm H2O to foot of air
mm H2O to kilonewton/square meter
mm H2O to foot of mercury
mm H2O to ounce/square inch
mm H2O to micrometer of water
mm H2O to petabar
mm H2O to meter of head
mm H2O to water column
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!