How many torr in 1 inches of mercury?
The answer is 25.4000035153.

We assume you are converting between **torr** and **inch of mercury [0 °C]**.

You can view more details on each measurement unit:

torr or
inches of mercury

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

1 pascal is equal to 0.00750061673821 torr, or 0.000295299830714 inches 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!

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widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.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