Torr Pressure Unit

Torr is a pressure unit which is defined as 1 standard atmosphere divided by 760 (1 atm/760 or 101325 Pa/760). Used mostly for measuring high vacuum, the torr has largely been superseded by the hPa (mbar) pressure unit. 1 torr equals 133.322 pascals.

The torr is closely related to millimetres of mercury (mmHg) and the two values are almost exactly the same. However the torr is an exact quantity, whereas the mmHg is not due to variations in local gravity and temperature, and therefore the two pressure units should not be treated as the same.

The type of instrumentation that uses torr units are low vacuum sensors such a Pirani or Ionisation Gauges. The torr is also used to specify the lowest pressure rating for high vacuum equipment such as vacuum pumps, valves and chambers.

Please use the table below to convert torr into other pressure units or click on the relevant engineering unit to view the value for converting to torr.

Please try our converter for pressure units if you are looking to convert a number of values to or from torr.

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Conversion Factors

• 0.00133322 bar
• 0.0193368 psi
• 1.33322 mbar
• 133.322 N/m²
• 133.322 Pa
• 1.33322 hPa
• 0.133322 kPa
• 0.000133322 MPa
• 0.00135951 kg/cm²
• 13.5951 mmH2O 4°C (39.2°F)
• 1.35951 cmH2O 4°C (39.2°F)
• 0.0135951 mH2O 4°C (39.2°F)
• 0.535240 inH2O 4°C (39.2°F)
• 0.0446033 ftH2O 4°C (39.2°F)
• 1.000000 mmHg 0°C (32°F)
• 0.1000000 cmHg 0°C (32°F)
• 0.0393701 inHg 0°C (32°F)
• 1 Torr
• 1000 mTorr
• 0.00131579 atm
• 0.00135951 at
• 1333.22 dyn/cm²
• 0.309388 oz/in²
• 1000.000 µHg 0°C (32°F)
• 0.00000863249 tsi (uk, long)
• 0.00000966839 tsi (usa, short)
• 0.00139225 tsf (usa, short)
• 2.78450 psf
• 1.35951 g/cm²

Please note that the conversion factors above are accurate to 6 significant figures.

Conversion Tables

Select a look up table for converting a pressure reading in Torr to other measurement units.

• mbar  »  1 to 1000 Torr → 1.33322 to 1,333.22 mbar
• bar  »  1 to 1000 Torr → 0.00133322 to 1.33322 bar
• psi  »  1 to 1000 Torr → 0.0193368 to 19.3368 psi

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