How many mm h2o in 1 mm Hg?
The answer is 13.5951002636.

We assume you are converting between **millimeter water [4 °C]** and **millimeter mercury [0 °C]**.

You can view more details on each measurement unit:

mm h2o or
mm Hg

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

1 pascal is equal to 0.101971621298 mm h2o, or 0.00750061561303 mm Hg.

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

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

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You can do the reverse unit conversion from mm Hg to mm h2o, or enter any two units below:

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The torr (symbol: Torr) or millimetre of mercury (mmHg) is a non-SI unit of pressure. It is the atmospheric pressure that supports a column of mercury 1 millimetre high. The unit is named after Evangelista Torricelli, Italian physicist and mathematician, for his discovery of the principle of the barometer in 1643.

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