Millitorr is a very small pressure unit used for high vacuum measurements and is a 1/1000x multiple of the Torr pressure unit. 1 mTorr equals 0.133322 pascals.

The millitorr is not a commonly used pressure unit and tends to be used in scientific research or specialised manufacturing fields where very high vacuum pressures are measured.

Please use the list below to find the conversion factor from torr into another pressure unit.

To find how many mTorr there are when converting from another pressure unit please click on the relevant unit below.

From our main pressure conversion page you can convert from or to any pressure unit by entering the value and selecting the units to convert.

**Vacuum measurement products**

- LEO1 (Ei) Digital Pressure Gauge
- Flush mountable vacuum transmitter
- Electronic Vacuum Switches
- Bi-directional 15psig 4-20mA out air pressure sensor for research use

## Conversion Factors

- 0.00000133322 bar
- 0.0000193368 psi
- 0.00133322 mbar
- 0.133322 N/m²
- 0.133322 Pa
- 0.00133322 hPa
- 0.000133322 kPa
- 0.000000133322 MPa
- 0.00000135951 kg/cm²
- 0.0135951 mmH2O 4°C (39.2°F)
- 0.00135951 cmH2O 4°C (39.2°F)
- 0.0000135951 mH2O 4°C (39.2°F)
- 0.000535240 inH2O 4°C (39.2°F)
- 0.0000446033 ftH2O 4°C (39.2°F)
- 0.001000000 mmHg 0°C (32°F)
- 0.0001000000 cmHg 0°C (32°F)
- 0.0000393701 inHg 0°C (32°F)
- 0.001 Torr
- 1 mTorr
- 0.00000131579 atm
- 0.00000135951 at
- 1.33322 dyn/cm²
- 0.000309388 oz/in²
- 1.000000 µHg 0°C (32°F)
- 0.00000000863249 tsi (uk, long)
- 0.00000000966839 tsi (usa, short)
- 0.00000139225 tsf (usa, short)
- 0.00278450 psf
- 0.00135951 g/cm²

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

**Vacuum measurement products**

- -760mmHg to +20 kg/cm² pressure transmitter with HART coms
- Precision hand pump with 1/4 NPT test gauge mount for -0.9 to 40 bar
- 30 inHg low relative vacuum range digital display vacuum pressure gauge and logger
- Vacuum gauge to measure both absolute & negative gauge pressure

## Help

*What does 10 millitorr equal in inHg gauge?*

The gauge reference does not influence the conversion unless the other pressure value does not have the same pressure reference.

10 mTorr = 0.00393701 inHg

**Vacuum measurement products**

- Low vacuum leak detection 4-20mA current loop sensor & gauge
- 0 to -300 mmH2O vacuum transmitter
- 1000 mbar absolute vacuum range 0-10Vdc output air pressure sensor for research use
- DMP331i High Accuracy Pressure Transmitter

## 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
- 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
- Torr Pressure Unit
- 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