**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 torr

mmHg to gigapascal

mmHg to centipascal

mmHg to gram/square centimetre

mmHg to meganewton/square metre

mmHg to pound/square inch [gauge]

mmHg to water column [inch]

mmHg to centimeter of mercury [0 °C]

mmHg to foot water [4 °C]