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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.
Pressure Converter
Please note that the above pressure unit converter limits input to 10 digits, produces results rounded to a maximum of 9 decimal places and uses conversion factors limited to 10 significant figures.
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.
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 or less 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
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
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
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