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Pressure Unit Conversion and Converter

Convert pressure units with the pressure unit converting tool, look up a conversion from the tables, identify a pressure unit and its group association with other pressure units or find the relevant pressure conversion factor in Pascals.


Sections: Converter | Tables | Factors | Groups


Pressure Converter






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Please note that the above pressure unit converter limits the entry of numbers to 10 digits or less. There is no restriction on the number of digits displayed in the answer, but some long answers may display in exponential form (e.g. 1.5e-4 = 0.00015).



Pressure Conversion Tables

Choose a look up table for converting a particular pressure unit or for a specific pressure conversion application.

Pressure Unit

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

More: Conversion Tables


Application Specific

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

More: Conversion Tables




Pressure Unit Conversion Factors

The following list shows each pressure unit and its equivalent value converted into Pascals (Pa). The Pascal is the SI unit for measuring pressure.

bar

Bar converts to 100,000 Pascals exactly

psi, pfsi, lb/in² or lbf/in²

Pounds per Square Inch or Pounds Force per Square Inch converts to 6,894.76 Pascals

mbar, mb or mbr

Millibar converts to 100 Pascals exactly

N/m²

Newton per Square Metre converts to 1 Pascal exactly

Pa

Pascal converts to 1 Pascal exactly (SI unit for pressure)

hPa

Hectopascal converts to 100 Pascals exactly

kPa

Kilopascal converts to 1,000 Pascals exactly

MPa

Megapascal converts to 1,000,000 Pascals exactly

kg/cm² or kgf/cm²

Kilogram per Square Centimeter or Kilogram Force per Square Centimetre converts to 98,066.5 Pascals exactly

Torr

Torr converts to 133.322 Pascals

mTorr

Millitorr converts to 0.133322 Pascals

atm

Standard Atmosphere converts to 101,325 Pascals exactly

at

Technical Atmosphere converts to 98,066.5 Pascals exactly

dyn/cm², dyne/cm² or dynes/cm²

Dyne per Square Centimeter converts to 0.1 Pascals exactly

oz/in² or ozf/in²

Ounce per Square Inch or Ounce Force per Square Inch converts to 430.922 Pascals

tsi or tfsi (uk, long)

Tons per Square Inch or Tons Force per Square Inch (uk, long) converts to 15,444,300 Pascals

tsi or tfsi (usa, short)

Tons per Square Inch or Tons Force per Square Inch (usa, short) converts to 13,789,500 Pascals

tsf or tfsf (usa, short)

Tons per Square Foot or Tons Force per Square Foot (usa, short) converts to 95,760.5 Pascals

psf or pfsf

Pounds per Square Foot or Pounds Force per Square Foot converts to 47.8803 Pascals

g/cm² or gf/cm²

Gram per Square Centimetre or Gram Force per Square Centimeter converts to 98.0665 Pascals exactly

Please note that the above pressure conversion factors are rounded to 6 significant figures, therefore they should not be treated as exact numbers unless the value in Pascals is proceeded by "exactly".


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. Each manometric pressure unit is shown with its equivalent value converted into Pascals (Pa). The Pascal is the SI unit for measuring pressure.

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 differing conventions used for the temperature and density of the liquid which can lead to slightly different values.

mmH2O, mmWG or mmWC @ 4°C

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

cmH2O, cmWG or cmWC @ 4°C

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

mH2O, mWG or mWC @ 4°C

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

inH2O, inWG or inWC @ 4°C

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

ftH2O, ftWG or ftWC @ 4°C

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

mmHg @ 0°C

Millimetres of Mercury at 0 Degrees Celsius converts to 133.322 Pascals

cmHg @ 0°C

Centimetres of Mercury at 0 Degrees Celsius converts to 1333.22 Pascals

inHg @ 0°C

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

µHg or µmHg @ 0°C

Microns of Mercury or Micrometres of Mercury at 0 degrees Celsius converts 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/s^2
Density of pure water at 4 deg C is 1000 kg/m^3
Density of mercury at 0 deg C is 13,595.1 kg/m^3

Please note that the above pressure conversion factors are rounded to 6 significant figures, therefore they should not be treated as exact numbers unless the value in Pascals is proceeded by "exactly".


Pressure Units Grouped by Relationship

Many units have a similar application or derivation, the use of each varies depending on country, industry and pressure value


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

Pa, hPa, kPa, MPa, N/m²

bar, mbar, mb, mbr

dyn/cm², dyne/cm², dynes/cm², d/cm²


Force related pressure units

kg/cm², kgf/cm², at, g/cm², gf/cm²

psi, pfsi, lb/in², lbf/in², oz/in², ozf/in²

tsi (uk, long), tfsi (uk, long), tsi (usa, short), tfsi (usa, short), tsf (usa, short), tfsf (usa, short), psf, pfsf


Water related pressure units

mm H2O, cm H2O, m H2O

mm WG, cm WG, m WG

mm WC, cm WC, m WC

in H2O, ft H2O

in WG, ft WG

in WC, ft WC


Mercury related pressure units

mm Hg, cm Hg, in Hg

µ Hg, µm Hg, micron Hg


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

 atm, Torr, mTorr


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Site Last Updated:  04/02/12

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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

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

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