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.
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
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
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
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.
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
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
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
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