How many torr in 1 inch mercury?
The answer is 25.400006316309.

We assume you are converting between **torr** and .

You can view more details on each measurement unit:

torr or
inch mercury

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

1 pascal is equal to 0.0075006168270417 torr, or 0.00029529980164712 inch mercury.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between torrs and inches mercury.

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

1 torr to inch mercury = 0.03937 inch mercury

10 torr to inch mercury = 0.3937 inch mercury

20 torr to inch mercury = 0.7874 inch mercury

30 torr to inch mercury = 1.1811 inch mercury

40 torr to inch mercury = 1.5748 inch mercury

50 torr to inch mercury = 1.9685 inch mercury

100 torr to inch mercury = 3.93701 inch mercury

200 torr to inch mercury = 7.87401 inch mercury

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

torr to atmosphere

torr to micron mercury

torr to dyne/square centimeter

torr to millimeter of water

torr to terabar

torr to millimeter mercury

torr to kilopond/square meter

torr to meganewton/square meter

torr to nanopascal

torr to ton/square inch

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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