How many mm Hg in 1 psi?
The answer is 51.7149241024.

We assume you are converting between **millimeter mercury [0 °C]** and **pound/square inch**.

You can view more details on each measurement unit:

mm Hg or
psi

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

1 pascal is equal to 0.00750061561303 mm Hg, or 0.000145037738007 psi.

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

Use this page to learn how to convert between millimeters mercury and pounds/square inch.

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You can do the reverse unit conversion from psi to mm Hg, 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.

The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/inē or lbf/inē) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch.

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