Torr - 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 Used mostly for measuring high vacuum, the Torr has largely been superceded by the hPa (mbar) pressure unit. 1 Torr equals 133.322 Pascals.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.

Torr Pressure 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.

Home > Pressure Measurement Glossary

Ask a Question

Site Last Updated: 08/02/12

Save

Tools

Pressure Conversion

Converts to

Reference

Glossary - Find explanations for terminology used in specifying and using pressure instruments

Pressure Conversion - Look up conversion factors or select a conversion table for a particular pressure unit

Pressure Measuring Guide - Collection of guidance notes for sourcing, setting up and using pressure measurement equipment

News Articles - Archive of application notes, product releases and technical information

Answers - Search for questions already answered or submit a new question about a pressure measurement topic or product

Specify

Pressure Sensor Specification - Select parameters with PSAT to generate a spec for your own use or to submit as an enquiry

Product Finder - Choose multiple product and application types to filter out a suitable product

Articles

27/03/09 : Measuring vacuum pressure with negative gauge or absolute pressure ranges
29/11/08 : What is the difference between a pressure transducer and a transmitter
15/09/08 : What is the difference between gauge and absolute pressure measurement
17/08/08 : What to consider when selecting a differential pressure sensor
10/02/08 : What affects the performance of low pressure sensors
19/01/08 : Supply voltage and load resistance considerations for pressure transmitters
06/01/08 : Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
18/09/07 : Interpreting specifications of pressure sensor accuracy