Torr (Torr)

The torr is 1/760 of an atmosphere, very nearly one millimeter of mercury.

Convert torr to any pressure unit

1 torr = 0.0193367747 pounds per square inch

Quick facts

Unit
Torr
Symbol
Torr
Measures
Pressure / Stress
System
Atmospheres & mercury
Equals
133.322368421 pascals
Definition
1/760 of a standard atmosphere (about 133.32 Pa).

1 torr in other units

Pounds per square inch0.0193367747 psi
Bars0.001333223684 bar
Kilopascals0.1333223684 kPa
Pascals133.3223684 Pa
Standard atmospheres0.001315789474 atm
Millimeters of mercury0.9999998575 mmHg
Hectopascals1.333223684 hPa
Megapascals0.000133322368 MPa

What is a torr?

The torr is 1/760 of an atmosphere, very nearly one millimeter of mercury. It is named after Evangelista Torricelli, who invented the barometer in 1643, and is used for vacuum measurements.

Where the torr sits among pressure units

The torr is number 14 of 44 on our scale of pressure units, ordered from smallest to largest.

Pound per square foot1 Torr = 2.7845 psf Centimeter of water1 Torr = 1.35951 cmH₂O Hectopascal1 Torr = 1.33322 hPa Millibar1 Torr = 1.33322 mbar Torrthis unit Millimeter of mercury1 mmHg = 1 Torr Inch of water1 inH₂O = 1.86832 Torr Kilopascal1 kPa = 7.50062 Torr Inch of mercury1 inHg = 25.4 Torr

Torr in real life

  • A good laboratory vacuum is below 10⁻⁶ Torr
  • Atmospheric pressure is 760 Torr

Top torr conversions

Common amounts of torr

Convert torr to all 45 other units

Metric (SI)

Atmospheres & mercury

Water column

US & imperial

Gravitational metric & CGS

Scientific

Convert to torr

Frequently asked questions

What is a torr?

The torr is 1/760 of an atmosphere, very nearly one millimeter of mercury.

How is the torr defined?

1/760 of a standard atmosphere (about 133.32 Pa).

How many pounds per square inch are in a torr?

One torr equals 0.0193367747 pounds per square inch.

How many bars are in a torr?

One torr equals 0.001333223684 bars.

How many kilopascals are in a torr?

One torr equals 0.1333223684 kilopascals.