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 Used mostly for measuring high vacuum, the Torr has largely been superceded by the hPa (mbar) pressure unit. 1 Torr equals 133.322 Pascals.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

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