How many millimeter of water in 1 millimeter mercury?
The answer is 13.5951.

We assume you are converting between **millimeter of water [4 °C]** and .

You can view more details on each measurement unit:

millimeter of water or
millimeter mercury

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

1 pascal is equal to 0.10197162129779 millimeter of water, or 0.0075006157584566 millimeter mercury.

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

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

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

1 millimeter of water to millimeter mercury = 0.07356 millimeter mercury

10 millimeter of water to millimeter mercury = 0.73556 millimeter mercury

20 millimeter of water to millimeter mercury = 1.47112 millimeter mercury

30 millimeter of water to millimeter mercury = 2.20668 millimeter mercury

40 millimeter of water to millimeter mercury = 2.94224 millimeter mercury

50 millimeter of water to millimeter mercury = 3.6778 millimeter mercury

100 millimeter of water to millimeter mercury = 7.35559 millimeter mercury

200 millimeter of water to millimeter mercury = 14.71118 millimeter mercury

You can do the reverse unit conversion from millimeter mercury to millimeter of water, or enter any two units below:

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.

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