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 Used mostly for measuring high vacuum, the torr has largely been superseded by the hPa (mbar) pressure unit. 1 torr equals 133.322 pascals.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.

**Vacuum measurement products**

- Negative room pressure monitor and logger for multiple zones
- Negative 500 mmH2O g range 4-20mA output pressure sensor
- Vacuum Pressure Transducers
- 400 mbar absolute (not relative) battery supplied vacuum sensing display

## 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

**Vacuum measurement products**

- 901 Prescal Pressure Switch Specification and Data Sheet
- LEX1 (Ei) High Accuracy Digital Pressure Gauge
- Vacuum drying pressure data logger
- Negative 250mbarg range 4-20mA out suction range pressure sensor

## Measurement Unit Related Terms

More pages related to measurement unit technical terms.

- at – Technical Atmosphere Pressure Unit
- atm – Standard Atmosphere Pressure Unit
- bar Pressure Unit
- cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
- cmHg – Centimetres of Mercury at 0 deg C Pressure Unit
- daPa – Dekapascal Pressure Unit
- dyn/cm² – Dyne per Square Centimetre Pressure Unit
- ftH2O – Feet of Water Column at 4 deg C Pressure Unit
- g – Acceleration due to Gravity
- g/cm² – Grams per Square Centimetre Pressure Unit
- hPa – Hectopascal Pressure Unit
- inH2O – Inches of Water Column at 4 deg C Pressure Unit
- inHg – Inches of Mercury at 0 degrees C Pressure Unit
- kg/cm² – Kilogram per Square Centimetre Pressure Unit
- kg/mm² – Kilogram per Square Millimetre Pressure Unit
- kPa – Kilopascal Pressure Unit
- ksi – Kilopounds per Square Inch Pressure Unit
- mbar – Millibar Pressure Unit
- mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
- mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
- mmHg – Millimetres of Mercury at 0 deg C Pressure Unit
- MPa – Megapascal Pressure Unit
- mPa – Millipascal Pressure Unit
- mTorr – Millitorr Pressure Unit
- N/cm² – Newton per Square Centimetre Pressure Unit
- N/m2 – Newton per Square Metre Pressure Unit
- N/mm² – Newton per Square Millimetre Pressure Unit
- oz/in² – Ounce per Square Inch Pressure Unit
- Pa – Pascal Pressure Unit
- Pressure
- Pressure Units
- psf – Pounds per Square Foot Pressure Unit
- psi – Pounds per Square Inch Pressure Unit
- Specific Gravity
- tsf – Tons per Square Foot (USA, Short) Pressure Unit
- tsi – Tons per Square Inch (UK, Long) Pressure Unit
- tsi – Tons per Square Inch (USA, Short) Pressure Unit
- Water Density
- µHg – Micron of Mercury at 0 deg C Pressure Unit