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

inch of mercury
inch of water

›› More information from the unit converter

How many inch of mercury in 1 inch of water? The answer is 0.073555912463681.
We assume you are converting between inch of mercury [0 C] and inch of water [4 C].
You can view more details on each measurement unit:
inch of mercury or inch of water
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529983071445 inch of mercury, or 0.0040146307866177 inch of 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 of water.
Type in your own numbers in the form to convert the units!

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

1 inch of mercury to inch of water = 13.5951 inch of water

2 inch of mercury to inch of water = 27.1902 inch of water

3 inch of mercury to inch of water = 40.7853 inch of water

4 inch of mercury to inch of water = 54.3804 inch of water

5 inch of mercury to inch of water = 67.9755 inch of water

6 inch of mercury to inch of water = 81.5706 inch of water

7 inch of mercury to inch of water = 95.1657 inch of water

8 inch of mercury to inch of water = 108.7608 inch of water

9 inch of mercury to inch of water = 122.3559 inch of water

10 inch of mercury to inch of water = 135.951 inch of water

›› Want other units?

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

Enter two units to convert


›› Common pressure conversions

inch of mercury to foot of head
inch of mercury to attobar
inch of mercury to barad
inch of mercury to terapascal
inch of mercury to centimeter water
inch of mercury to millimeter of mercury
inch of mercury to centimeter of mercury
inch of mercury to kip/square inch
inch of mercury to gigapascal
inch of mercury to barye

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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