How many inch of water in 1 inch of mercury?
The answer is 13.595100196653.

We assume you are converting between **inch of water [4 °C]** and **inch of mercury [0 °C]**.

You can view more details on each measurement unit:

inch of water or
inch of mercury

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

1 pascal is equal to 0.0040146307866177 inch of water, or 0.00029529983071445 inch of 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 of mercury.

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

1 inch of water to inch of mercury = 0.07356 inch of mercury

10 inch of water to inch of mercury = 0.73556 inch of mercury

20 inch of water to inch of mercury = 1.47112 inch of mercury

30 inch of water to inch of mercury = 2.20668 inch of mercury

40 inch of water to inch of mercury = 2.94224 inch of mercury

50 inch of water to inch of mercury = 3.6778 inch of mercury

100 inch of water to inch of mercury = 7.35559 inch of mercury

200 inch of water to inch of mercury = 14.71118 inch of mercury

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

inch of water to nanopascal

inch of water to megabar

inch of water to inch of air

inch of water to petapascal

inch of water to nanobar

inch of water to water column

inch of water to zeptopascal

inch of water to pound/square inch

inch of water to atmosphere

inch of water to poundal/square foot

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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