›› Convert inch of mercury [0 C] to inch water [4 C]


inch of mercury
inch water

›› More information from the unit converter

How many inch of mercury in 1 inch water? The answer is 0.073555912463681.
We assume you are converting between inch of mercury [0 C] and inch water [4 C].
You can view more details on each measurement unit:
inch of mercury or inch water
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529983071445 inch of mercury, 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 inches of mercury and inches water.
Type in your own numbers in the form to convert the units!


›› Quick conversion chart of inch of mercury to inch water

1 inch of mercury to inch water = 13.5951 inch water

2 inch of mercury to inch water = 27.1902 inch water

3 inch of mercury to inch water = 40.7853 inch water

4 inch of mercury to inch water = 54.3804 inch water

5 inch of mercury to inch water = 67.9755 inch water

6 inch of mercury to inch water = 81.5706 inch water

7 inch of mercury to inch water = 95.1657 inch water

8 inch of mercury to inch water = 108.7608 inch water

9 inch of mercury to inch water = 122.3559 inch water

10 inch of mercury to inch water = 135.951 inch water


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›› Common pressure conversions

inch of mercury to dyne/square centimeter
inch of mercury to megabar
inch of mercury to nanopascal
inch of mercury to yottapascal
inch of mercury to inch mercury
inch of mercury to centitorr
inch of mercury to millimeter of mercury
inch of mercury to ounce/square inch
inch of mercury to ton/square inch
inch of mercury to petapascal


›› Definition: Inch of mercury

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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


›› Metric conversions and more

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!