**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 yottapascal

mmHg to megapascal

mmHg to inch of air [15 °C]

mmHg to dekabar

mmHg to water column [millimeter]

mmHg to ton/square foot [long]

mmHg to meter of head

mmHg to zeptobar

mmHg to micrometer of water [4 °C]