Pressure Converter and Conversion Guide

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Pressure Conversion Guide

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 Conversion Tables

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

Select one of these pressure units to jump to the section of the page which includes links to tables for converting the chosen unit to another unit:

Apps | bar | psi | mbar | Pa | kPaMPAkg/cm²mmH2O | mH2O | inH2O | ftH2O | mmHg | inHg | Torr

Applications ↓

 

bar ↓

  • psi, inHg, mH2O and ftH2O
  • psi  »  1 to 1,000 bar → 14.5038 to 14,503.8 psi
  • Pa  »  0.01 to 10.00 bar → 1000 to 1,000,000 Pa
  • kPa  »  0.1 to 100.0 bar → 10.0000 to 10,000.0 kPa
  • MPa  »  1 to 1000 bar → 0.1 to 100.0 MPa
  • kg/cm²  »  1 to 1000 bar → 1.01972 to 1019.72 kg/cm²
  • mH2O  »  0.01 to 10.00 bar → 0.101972 to 101.972 mH2O
  • inH2O  »  0.001 to 1.000 bar → 0.401463 to 401.463 inH2O
  • ftH2O  »  0.01 to 10.00 bar → 0.334553 to 334.553 ftH2O
  • atm  »  0.1 to 100.0 bar → 0.0986923 to 98.6923 atm

 

psi ↓

  • mbar, hPa, Bar, inHg, mH2O, inH2O and ftH2O
  • bar  »  1 to 100,000 psi → 0.0689476 to 6,894.76 bar
  • mbar  »  0.1 psi to 100.0 psi → 6.89476 to 6,894.76 mbar
  • Pa  »  0.01 psi to 20.00 psi → 68.9476 to 137,895 Pa
  • hPa  »  0.1 psi to 100.0 psi → 6.89476 to 6,894.76 hPa
  • kPa  »  1 to 1,000 psi → 6.89476 to 6,894.76 kPa
  • MPa  »  100 to 100,000 psi → 0.689476 to 689.476 MPa
  • kg/cm²  »  1 to 100,000 psi  → 0.0703070 to 7,030.70 kg/cm²
  • mH2O  »  1 to 1000 psi → 0.703070 to 703.070 mH2O
  • inH2O  »  0.1 to 100.0 psi → 2.76799 to 2767.99 inH2O
  • ftH2O  »  1 to 1,000 psi → 2.30666 to 2,306.66 ftH2O
  • mmHg  »  0.01 to 20.00 psi → 0.517149 to 1,034.30 mmHg
  • inHg  »  0.01 to 20.00 psi → 0.0203602 to 40.7204 mmHg

 

mbar ↓

  • psi  »  1 to 2,000 mbar → 0.0145038 to 29.0075 psi
  • Pa  »  1 to 2,000 mbar → 100 to 200,000 Pa
  • kPa  »  1 to 2,000 mbar → 0.1 to 200.0 kPa
  • inH2O  »  1 to 2,000 mbar → 0.401463 to 802.926 inH2O
  • mmHg  »  1 to 2,000 mbar → 0.750062 to 1,500.12 mmHg
  • inHg  »  1 to 2,000 mbar → 0.0295300 to 59.0600 inHg
  • Torr  »  1 to 2,000 mbar → 0.750062 to 1,500.12 Torr

 

Pa ↓

  • psi  »  100 to 100,000 Pa → 0.0145038 to 14.5038 psi
  • mmH2O  »  1 to 1000 Pa → 0.101972 to 101.972 mmH2O
  • inH2O  »  1 to 1000 Pa → 0.00401463 to 4.01463 inH2O
  • mmHg  »  1 to 1000 Pa → 0.00750062 to 7.50062 mmHg
  • Torr  »  1 to 1,000 Pa → 0.00750062 to 7.50062 Torr

 

kPa ↓

  • psi  »  1 to 1000 kPa → 0.145038 to 145.038 psi
  • kg/cm²  »  1 to 1000 kPa → 0.0101972 to 10.1972 kg/cm²
  • mH2O  »  1 to 1000 kPa → 0.101972 to 101.972 mH2O
  • inH2O  »  1 to 1000 kPa → 4.01463 to 4014.63 inH2O
  • ftH2O  »  1 to 1000 kPa → 0.334553 to 334.553 ftH2O
  • mmHg  »  1 to 1000 kPa → 7.50062 to 7500.62 mmHg
  • Torr  »  1 to 1,000 kPa → 7.50062 to 7500.62 Torr

 

MPa ↓

  • psi  »  1 to 1000 MPa → 145.038 to 145038 psi
  • kg/cm²  »  1 to 1000 MPa → 10.1972 to 10197.2 kg/cm²
  • ksi  »  1 to 1000 MPa → 0.145038 to 145.038 ksi

 

kg/cm² ↓

  • bar  »  1 to 1000 kg/cm² → 0.980665 to 980.665 bar
  • psi  »  1 to 1000 kg/cm² → 14.2233 to 14,223.3 psi
  • kPa  »  0.01 to 100.00 kg/cm² → 0.98067 to 980.665 kPa
  • MPa  »  1 to 1000 kg/cm² → 0.0980665 to 98.0665 MPa
  • N/mm²  »  1 to 1000 kg/cm² → 0.0980665 to 98.0665 N/mm²

 

mmH2O ↓

  • mmHg  »  10 to 10,000 mmH2O → 0.735559 to 735.559 ftH2O

 

mH2O ↓

 

inH2O ↓

 

ftH2O ↓

  • mH2O  »  1 to 1000 ftH2O → 0.30480 to 304.800 mH2O

 

mmHg ↓

  • kPa  »  1 to 1000 mmHg → 0.133322 to 133.322 kPa

 

inHg ↓

  • mbar  »  23.00 to 36.00 inHg → 778.869 to 1219.10 mbar
  • mmHg  »  23.00 to 36.00 inHg → 584.200 to 914.400 mmHg

 

Torr ↓

  • mbar  »  1 to 1000 Torr → 1.33322 to 1,333.22 mbar

 

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.

Unique Conversion Factors

These units have a defined conversion value which is internationally agreed and are always the same value

Symbol Name Pascals Value
bar Bar 100,000
psi, pfsi, lb/in², lbf/in² Pounds Force/Sq. Inch 6894.75729316836…
mbar, mb, mbr Millibar 100
N/m² Newton/Sq. Metre 1
Pa Pascal 1
hPa Hectopascal 100
kPa Kilopascal 1,000
MPa Megapascal 1,000,000
kg/cm², kgf/cm² Kilogram Force/Sq. Centimetre 98,066.5
Torr Torr 133.322368421053…
mTorr Millitorr 0.133322368421053…
atm Standard Atmosphere 101,325
at Technical Atmosphere 98,066.5
dyn/cm², dyne/cm² Dyne/Sq. Centimetre 0.1
oz/in², ozf/in² Ounce Force/Sq. Inch 430.922330823023…
tsi, tfsi (uk, long) Tons Force/Sq. Inch (uk, long) 15,444,256.3366971…
tsi, tfsi (usa, short) Tons Force/Sq. Inch (usa, short) 13,789,514.5863367…
tsf, tfsf (usa, short) Tons Force/Sq. Foot (usa, short) 95,760.5179606717…
psf, pfsf Pounds Force/Sq. Foot 47.8802589803358…
g/cm², gf/cm² Gram Force/Sq. Centimetre 98.0665

 

N.B. Numbers which include [...] on the end are rounded.

 

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. The physical assumptions that these conversions factors are based can be found at the bottom of this 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 variation in accuracy.

Symbol Name Pascals Value
mmH2O, mmWG, mmWC Millimetres of Water 9.80665
cmH2O, cmWG, cmWC Centimetres of Water 98.0665
mH2O, mWG, mWC Metres of Water 9,806.65
inH2O, inWG, inWC Inches of Water 249.08891
ftH2O, ftWG, ftWC Feet of Water 2,989.06692
mmHg Millimetres of Mercury 133.322387415
cmHg Centimetres of Mercury 1,333.22387415
inHg Inches of Mercury 3,386.388640341
µHg, µmHg Microns of Mercury 0.133322387415

 

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 9.80665 m/s²
  • Density of pure water at 4 deg C is 1000 kg/m³
  • Density of mercury at 0 deg C is 13,595.1 kg/m³

 

Pressure Unit Groups

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

 

Force related pressure units

 

Water related pressure units

 

Mercury related pressure units

 

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

 

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