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
N.B. The above pressure unit converter limits the answer value to 9 significant figures and long values will display in exponential form, e.g. 1.5032e+8 = 150320000.
Choose a look up table for converting a particular pressure unit or for a specific pressure conversion application.
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 converts to 100,000 Pascals exactly | |
Pounds per Square Inch or Pounds Force per Square Inch converts to 6894.75729316836... Pascals | |
Millibar converts to 100 Pascals exactly | |
Newton per Square Metre converts to 1 Pascal exactly | |
Pascal converts to 1 Pascal exactly (SI unit for pressure) | |
Hectopascal converts to 100 Pascals exactly | |
Kilopascal converts to 1,000 Pascals exactly | |
Megapascal converts to 1,000,000 Pascals exactly | |
Kilogram per Square Centimeter or Kilogram Force per Square Centimetre converts to 98,066.5 Pascals exactly | |
Torr converts to 133.322368421053... Pascals | |
Millitorr converts to 0.133322368421053... Pascals | |
Standard Atmosphere converts to 101,325 Pascals exactly | |
Technical Atmosphere converts to 98,066.5 Pascals exactly | |
Dyne per Square Centimeter converts to 0.1 Pascals exactly | |
Ounce per Square Inch or Ounce Force per Square Inch converts to 430.922330823023... Pascals | |
Tons per Square Inch or Tons Force per Square Inch (uk, long) converts to 15,444,256.3366971... Pascals | |
Tons per Square Inch or Tons Force per Square Inch (usa, short) converts to 13,789,514.5863367... Pascals | |
Tons per Square Foot or Tons Force per Square Foot (usa, short) converts to 95,760.5179606717... Pascals | |
Pounds per Square Foot or Pounds Force per Square Foot converts to 47.8802589803358... Pascals | |
Gram per Square Centimetre or Gram Force per Square Centimeter converts to 98.0665 Pascals exactly |
N.B. Numbers which include [...] on the end are rounded.
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.
Millimetres of Water Gauge or Millimetres of Water Column at 4 Degrees Celsius converts to 9.80665 Pascals | |
Centimetres of Water Gauge or Centimetres of Water Column at 4 Degrees Celsius converts to 98.0665 Pascals | |
Metres of Water Gauge or Metres of Water Column at 4 Degrees Celsius converts to 9,806.65 Pascals | |
Inches of Water Gauge or Inches of Water Column at 4 Degrees Celsius converts to 249.08891 Pascals | |
Feet of Water Gauge or Feet of Water Column at 4 Degrees Celsius converts to 2,989.06692 Pascals | |
mmHg @ 0°C | Millimetres of Mercury at 0 Degrees Celsius converts to 133.322387415 Pascals |
cmHg @ 0°C | Centimetres of Mercury at 0 Degrees Celsius converts to 1,333.22387415 Pascals |
inHg @ 0°C | Inches of Mercury at 0 Degrees Celsius converts to 3,386.388640341 Pascals |
Microns of Mercury or Micrometres of Mercury at 0 degrees Celsius converts to 0.133322387415 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
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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