**Full name:** millimeter of mercury [0 °C]

**Plural form:** millimeters of mercury

**Symbol:** mmHg

**Alternate spelling:** mm of mercury

**Category type:** pressure

**Scale factor:** 133.32239

The SI derived unit for pressure is the pascal.

1 pascal is equal to 0.00750061561303 mmHg.

Valid units must be of the **pressure** type.

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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.

mmHg to kilogram-force/square metre

mmHg to attopascal

mmHg to pound/square inch [absolute]

mmHg to nanobar

mmHg to inch of mercury [0 °C]

mmHg to microbar

mmHg to pound/square foot

mmHg to centimeter of water [4 °C]

mmHg to centihg