How many inch mercury in 1 millimeter of water?
The answer is 0.0028959017998228.

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

You can view more details on each measurement unit:

inch mercury or
millimeter of water

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

1 pascal is equal to 0.00029529980164712 inch mercury, or 0.10197162129779 millimeter of water.

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

Use this page to learn how to convert between inches mercury and millimeters of water.

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

1 inch mercury to millimeter of water = 345.31558 millimeter of water

2 inch mercury to millimeter of water = 690.63115 millimeter of water

3 inch mercury to millimeter of water = 1035.94673 millimeter of water

4 inch mercury to millimeter of water = 1381.26231 millimeter of water

5 inch mercury to millimeter of water = 1726.57788 millimeter of water

6 inch mercury to millimeter of water = 2071.89346 millimeter of water

7 inch mercury to millimeter of water = 2417.20904 millimeter of water

8 inch mercury to millimeter of water = 2762.52461 millimeter of water

9 inch mercury to millimeter of water = 3107.84019 millimeter of water

10 inch mercury to millimeter of water = 3453.15577 millimeter of water

You can do the reverse unit conversion from millimeter of water to inch mercury, or enter any two units below:

inch mercury to ton/square inch

inch mercury to attopascal

inch mercury to zettapascal

inch mercury to millibar

inch mercury to decibar

inch mercury to kilogram-force/square meter

inch mercury to zeptobar

inch mercury to petabar

inch mercury to kilopascal

inch mercury to kip/square inch

Inches of mercury or inHg is a non-SI unit for pressure. It is still widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.

It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity.

1 inHg = 3,386.389 pascals at 0 °C.

Aircraft operating at higher altitudes (above 18,000 feet) set their barometric altimeters to a standard pressure of 29.92 inHg or 1,013.2 hPa (1 hPa = 1 mbar) regardless of the actual sea level pressure, with inches of mercury used in the U.S. and Canada. The resulting altimeter readings are known as flight levels.

Piston engine aircraft with constant-speed propellers also use inHg to measure manifold pressure, which is indicative of engine power produced.

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