Pressure Unit Conversion and Converter

Convert pressure units here with the pressure unit converting tool, identify a pressure unit and its association with other pressure units or look up the relevant Pascal unit pressure conversion factor below.

Enter the pressure value and select the unit you want to convert on the left hand side, then select the pressure unit you want a conversion for on the right hand side.



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Pressure Transmitters (mA)

Pressure Transducers (V)

Digital Pressure Sensors



Pressure Units Converter



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Digital Pressure Gauges

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Pressure Conversion Tables

bar to psi, inHg, mH2O and ftH2O

psi to mbar, hPa, Bar, inHg, mH2O, inH2O and ftH2O

mH2O to ftH2O, bar, psi and inHg

inH2O to mmH2O, mbar, psi and mmHg



Tyre pressure for cars, trucks, cycles, motorbikes or aircraft

Barometric mbar (hPa) to psi, inhg, mmHg and torr

Altitude in feet or meters to pressure



Pressure Unit Conversion Factors

The following list shows each pressure unit and its equivalent value converted into Pascals (Pa) which is the SI unit of measure for pressure:

bar

Bar convert to 100,000 Pascals exactly

psi

Pounds per Square Inch convert to 6894.76 Pascals

mb or mbar

Millibar convert to 100 Pascals exactly

hPa

Hectopascal convert to 100 Pascals exactly

kPa

Kilopascal convert to 1,000 Pascals

MPa

Megapascal convert to 1,000,000 Pascals

Kgf/cm² or kg/cm²

Kilogram force per Square Centimetre convert to 98,066.5 Pascals

N/m²

Newton per Square Metre convert to 1 Pascal (SI unit for pressure)

torr

Torr convert to 133.322 Pascals

mtorr

Millitorr convert to 0.133322 Pascals

1 atm

1 Atmosphere convert to 101325 Pascals exactly

Dynes/cm² or D/cm²

Dynes per Square Centmetre convert to 0.1 Pascals exactly

oz/in²

Ounces per Square Inch convert to 430.922 Pascals

tsi (UK) or tfsi (UK)

Tonnes Force per Square Inch (Long, UK) convert to 15444300 Pascals

tsi (USA) or tfsi (USA)

Ton Force per Square Inch (Short, USA) convert to 13789500 Pascals

tsf (USA) or tfsf (USA)

Tons Force per Square Foot (Short, USA) convert to 95760.5 Pascals

psf

Pounds per Square Foot convert to 47.8803 Pascals

g/cm² or gf/cm²

Grammes Force per Square Centimetre convert to 98.0665 Pascals



Manometric Pressure Unit Conversion Factors

The following units are known as manometric pressure units and are derived from the pressure exerted by a column of liquid under the acceleration of earth's gravity.

Since the pressure of the fluid column can vary with changes in liquid density and local gravity it is important to quantify these factors when using these units and these are highlighted at the bottom of this manometric units section.

The use of manometric units is discouraged by national standard organisations because they do not precisely represent the true pressure and there are various conventions used for the temperature and density of the liquid which can lead to confusion.

mmH2O, mmWG or mmWC @ 4°C

Millimetres of Water Gauge or Column at 4 Degrees Celsius convert to 9.80665 Pascals

cmH2O, cmWG or cmWC @ 4°C

Centimetres of Water Gauge or Column at 4 Degrees Celsius convert to 98.0665 Pascals

mH2O, mWG or mWC @ 4°C

Metres of Water Gauge or Column at 4 Degrees Celsius convert to 9,806.65 Pascals

inH2O, inWG or inWC @ 4°C

Inches of Water Gauge or Column at 4 Degrees Celsius convert to 249.089 Pascals

ftH2O, ftWG or ftWC @ 4°C

Feet of Water Gauge or Column at 4 Degrees Celsius convert to 2,989.07 Pascals

mmHg @ 0°C

Millimetres of Mercury at 0 Degrees Celsius convert to 133.322 Pascals

inHg @ 0°C

Inches of Mercury at 0 Degrees Celsius convert to 3,386.39 Pascals

µHg or micronsHg @ 0°C

Microns of Mercury at 0 degrees Celsius convert to 0.133322 Pascals

The above manometric pressure units assume the following in their derivation and although they are not physical constants they have been accepted as popular conventions and are used universally:

Standard acceleration due to gravity of 9.80665m/s2
Density of pure water at 4 deg C is 1000 kg/m3
Density of mercury at 0 deg C is 13,595.08 kg/m3

Please note that the above pressure units converter produces results rounded to 3 decimal places and the pressure conversion factors are rounded to 6 significant figures, therefore they should not be treated as exact conversions unless otherwise stated.



Pressure Units Grouped By Relationship

Pressure units derived from 'Pascal' the SI unit for pressure

Pa, hPa, kPa, MPa,N/m2

bar, mbar, mb

dynes/cm2, dyne/cm2, D/cm2



Force related pressure units

kgf/cm2, kg/cm2, gf/cm2, g/cm2

psi, oz/in2

tsi, tfsi, tsf, tfsf, psf



Water related pressure units

mm-H2O 4 deg C, cm-H2O 4 deg C, mH2O 4 deg C

mm-WG 4 deg C, cm-WG 4 deg C, mWG 4 deg C

mm-WC 4 deg C, cm-WC 4 deg C, mWC 4 deg C

in-H2O 4 deg C, ft-H2O 4 deg C

in-WG 4 deg C, ft-WG 4 deg C

in-WC 4 deg C, ft-WC 4 deg C



Mercury related pressure units

mm-Hg 0 deg C, cm-Hg 0 deg C, in-Hg 0 deg C

microns Hg 0 deg C, micron Hg 0 deg C



Pressure units derived from 1 atmosphere (1 atm = 101325 Pascals)

torr, mtorr



Pressure Measurement Resource Links

Convert a pressure unit

Convert temperature units to and from degrees celsius, fahrenheit or kelvin

Explain an IP rating for ingress protection

Explanations for pressure measurement terms


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Site Last Updated:  03/07/09

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Pressure Measurement Glossary - Find explanations of terminology used for specifying and using pressure instruments

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