How many torr in 1 inch of mercury?
The answer is 25.400003816103.
We assume you are converting between torr and inch of mercury [0 °C].
You can view more details on each measurement unit:
torr or inch of mercury
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.0075006168270417 torr, 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 torrs and inches of mercury.
Type in your own numbers in the form to convert the units!
1 torr to inch of mercury = 0.03937 inch of mercury
10 torr to inch of mercury = 0.3937 inch of mercury
20 torr to inch of mercury = 0.7874 inch of mercury
30 torr to inch of mercury = 1.1811 inch of mercury
40 torr to inch of mercury = 1.5748 inch of mercury
50 torr to inch of mercury = 1.9685 inch of mercury
100 torr to inch of mercury = 3.93701 inch of mercury
200 torr to inch of mercury = 7.87401 inch of mercury
You can do the reverse unit conversion from inch of mercury to torr, or enter any two units below:
torr to gram/square centimeter
torr to attopascal
torr to yoctopascal
torr to kip/square foot
torr to inch water
torr to kilogram-force/square millimeter
torr to hectopascal
torr to yottabar
torr to kilopascal
torr to kilopond/square centimeter
The torr is a non-SI unit of pressure, named after Evangelista Torricelli. Its symbol is Torr.
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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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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