›› Convert to inch of water [4 °C]

millimeter mercury
inch of water

›› More information from the unit converter

How many millimeter mercury in 1 inch of water? The answer is 1.8683201911017.
We assume you are converting between and inch of water [4 °C].
You can view more details on each measurement unit:
millimeter mercury or inch of water
The SI derived unit for pressure is the pascal.
1 pascal is equal to 0.0075006157584566 millimeter mercury, or 0.0040146307866177 inch of water.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between millimeters mercury and inches of water.
Type in your own numbers in the form to convert the units!

›› Quick conversion chart of millimeter mercury to inch of water

1 millimeter mercury to inch of water = 0.53524 inch of water

5 millimeter mercury to inch of water = 2.6762 inch of water

10 millimeter mercury to inch of water = 5.3524 inch of water

20 millimeter mercury to inch of water = 10.7048 inch of water

30 millimeter mercury to inch of water = 16.0572 inch of water

40 millimeter mercury to inch of water = 21.40961 inch of water

50 millimeter mercury to inch of water = 26.76201 inch of water

75 millimeter mercury to inch of water = 40.14301 inch of water

100 millimeter mercury to inch of water = 53.52402 inch of water

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

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›› Common pressure conversions

millimeter mercury to technical atmosphere
millimeter mercury to inch of air
millimeter mercury to exapascal
millimeter mercury to zeptopascal
millimeter mercury to centimeter of mercury
millimeter mercury to poundal/square foot
millimeter mercury to kip/square inch
millimeter mercury to pieze
millimeter mercury to micrometer of mercury
millimeter mercury to ton/square foot

›› Definition: Millimeter mercury

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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