How many mm Hg in 1 torr?
The answer is 0.9999998575337.

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

You can view more details on each measurement unit:

mm Hg or
torr

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

1 pascal is equal to 0.0075006157584566 mm Hg, or 0.0075006168270417 torr.

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

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

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

1 mm Hg to torr = 1 torr

5 mm Hg to torr = 5 torr

10 mm Hg to torr = 10 torr

15 mm Hg to torr = 15 torr

20 mm Hg to torr = 20 torr

25 mm Hg to torr = 25 torr

30 mm Hg to torr = 30 torr

40 mm Hg to torr = 40.00001 torr

50 mm Hg to torr = 50.00001 torr

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

mm Hg to kip/square inch

mm Hg to dyne/square centimeter

mm Hg to kilonewton/square meter

mm Hg to poundal/square foot

mm Hg to pieze

mm Hg to picobar

mm Hg to centibar

mm Hg to kilogram-force/square millimeter

mm Hg to foot of mercury

mm Hg to foot of water

The millimeter of mercury by definition is 133.322387415 Pa (13.5951 g/cm3 × 9.80665 m/s2 × 1 mm), which is approximated with known accuracies of density of mercury and standard gravity.

The torr is defined as 1/760 of one standard atmosphere, while the atmosphere is defined as 101325 pascals. Therefore, 1 Torr is equal to

101325/760 Pa. The decimal form of this fraction is approximately 133.322368421.

The relationship between the torr and the millimeter of mercury is:

1 Torr = 0.999999857533699 mmHg

1 mmHg = 1.000000142466321 Torr

The difference between one millimeter of mercury and one torr, as well as between one atmosphere (101.325 kPa) and 760 mmHg (101.3250144354 kPa), is less than one part in seven million (or less than 0.000015%). This small difference is negligible for most applications outside metrology.

The torr is a non-SI unit of pressure, named after Evangelista Torricelli. Its symbol is Torr.

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