›› Convert to inch of water column


inch mercury
inch water column


›› More information from the unit converter

How many inch mercury in 1 inch water column? The answer is 0.073555905223332.
We assume you are converting between and inch of water column.
You can view more details on each measurement unit:
inch mercury or inch water column
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.00029529980164712 inch mercury, or 0.0040146307866177 inch water column.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between inches mercury and inches water column.
Type in your own numbers in the form to convert the units!


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

1 inch mercury to inch water column = 13.5951 inch water column

2 inch mercury to inch water column = 27.1902 inch water column

3 inch mercury to inch water column = 40.7853 inch water column

4 inch mercury to inch water column = 54.38041 inch water column

5 inch mercury to inch water column = 67.97551 inch water column

6 inch mercury to inch water column = 81.57061 inch water column

7 inch mercury to inch water column = 95.16571 inch water column

8 inch mercury to inch water column = 108.76081 inch water column

9 inch mercury to inch water column = 122.35591 inch water column

10 inch mercury to inch water column = 135.95102 inch water column



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›› Common pressure conversions

inch mercury to centimeter mercury
inch mercury to decipascal
inch mercury to zeptopascal
inch mercury to kip/square foot
inch mercury to newton/square millimeter
inch mercury to foot of mercury
inch mercury to micrometer of water
inch mercury to meter of head
inch mercury to foot mercury
inch mercury to kilopascal


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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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