How many inch of water in 1 inch mercury?
The answer is 13.595101534864.

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

You can view more details on each measurement unit:

inch of water or
inch mercury

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

1 pascal is equal to 0.0040146307866177 inch of water, or 0.00029529980164712 inch mercury.

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

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

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

1 inch of water to inch mercury = 0.07356 inch mercury

10 inch of water to inch mercury = 0.73556 inch mercury

20 inch of water to inch mercury = 1.47112 inch mercury

30 inch of water to inch mercury = 2.20668 inch mercury

40 inch of water to inch mercury = 2.94224 inch mercury

50 inch of water to inch mercury = 3.6778 inch mercury

100 inch of water to inch mercury = 7.35559 inch mercury

200 inch of water to inch mercury = 14.71118 inch mercury

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

inch of water to millimeter of mercury

inch of water to foot mercury

inch of water to decibar

inch of water to kilogram-force/square meter

inch of water to zettabar

inch of water to pascal

inch of water to petabar

inch of water to foot water

inch of water to kilopond/square millimeter

inch of water to ounce/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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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