Pressure Conversion
Convert pressure between PSI, bar, pascal, atmosphere, torr, and 35+ units instantly. Essential for engineering, HVAC, and automotive applications. See also our Air Pressure Calculator and Bar to PSI Converter.
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Popular Pressure Converters:
What is a Pressure Converter?
A pressure converter is a tool that converts measurements between different units of pressure such as pascal, bar, PSI, atmosphere, and torr. It is essential for engineering, meteorology, tire maintenance, HVAC systems, and any application involving fluid or gas pressure.
How to Convert Pressure Units
Select the pressure unit you want to convert from and the unit you want to convert to using the dropdown menus. Enter your value in the input field and the converter will instantly calculate the equivalent pressure. Use the popular conversion links below for common conversions like bar to PSI.
Pressure Conversion Formulas
History of Pressure Measurement
Torricelli invented the mercury barometer in 1643, enabling the first atmospheric pressure measurements. Blaise Pascal demonstrated that pressure decreases with altitude and formulated Pascal's law in the 1640s. The SI unit pascal (Pa) is named in his honor and equals one newton per square meter.
About This Pressure Converter
This pressure converter supports 35 different units including pascal, kilopascal, megapascal, bar, millibar, PSI, KSI, standard atmosphere, torr, mmHg, inHg, and various force-per-area combinations. It covers units used in engineering, meteorology, and industrial applications.
Frequently Asked Questions
How do I convert bar to PSI?
Multiply bar by 14.5038 to get PSI. For example, 2 bar = 2 × 14.5038 = 29.01 PSI.
What is standard atmospheric pressure?
Standard atmospheric pressure is 1 atm = 101,325 Pa = 1.01325 bar = 14.696 PSI = 760 mmHg. This is the average pressure at sea level.
What is the difference between PSI and bar?
PSI (pounds per square inch) is common in the US, while bar is used in most other countries. 1 bar = 14.5038 PSI. Bar is close to atmospheric pressure (1 atm ≈ 1.013 bar).
How do I convert kPa to PSI?
Multiply kilopascals by 0.145038 to get PSI. For example, 200 kPa = 200 × 0.145038 = 29.01 PSI.
What pressure unit is used for tire pressure?
In the US, tire pressure is measured in PSI (typically 30-35 PSI for cars). In Europe and most other countries, bar or kPa is used (2.0-2.5 bar or 200-250 kPa).
Metric Conversion Factor Tables for Pressure Converter
| Units to convert | Multiply By The Number | Convert as Unit |
|---|---|---|
| Bar | 14.5038 | PSI |
| PSI | 0.0689476 | Bar |
| Bar | 100000 | Pascal (Pa) |
| Pascal (Pa) | 0.00001 | Bar |
| Bar | 0.986923 | Atmosphere (atm) |
| Atmosphere (atm) | 1.01325 | Bar |
| Atmosphere (atm) | 101325 | Pascal (Pa) |
| Atmosphere (atm) | 14.696 | PSI |
| PSI | 6894.76 | Pascal (Pa) |
| PSI | 6.89476 | Kilopascal (kPa) |
| Kilopascal (kPa) | 0.145038 | PSI |
| Torr | 133.322 | Pascal (Pa) |
| Atmosphere (atm) | 760 | Torr |
| Bar | 1000 | Millibar (mbar) |
Pressureconverters & it's abbreviations
| Unit | Abbreviation | Unit | Abbreviation | Unit | Abbreviation |
|---|---|---|---|---|---|
| pascal | Pa | kilopascal | kPa | megapascal | MPa |
| gigapascal | GPa | terapascal | TPa | bar | bar |
| millibar | mbar | microbar | µbar | psi | psi |
| ksi | ksi | Standard atmosphere | atm | torr | Torr |
| millimeter mercury | mmHg | inch mercury | inHg | inch water | inAq |
| micropascal | µPa | millipascal | mPa | nanopascal | nPa |
| picopascal | pPa |
Complete list of Pressure conversion units and its conversion.
- 1 bar = 14.5037738007 psi
bar to psi → - 1 bar = 100000 pascal [Pa]
bar to pascal → - 1 bar = 100 kilopascal [kPa]
bar to kpa →
- 1 bar = 0.1 megapascal [MPa]
bar to mpa → - 1 bar = 0.0014503774 ksi
bar to ksi → - 1 psi = 0.0689475729 bar
psi to bar →
- 1 psi = 51.7149326 torr [Torr]
psi to torr → - 1 psi = 0.001 ksi
psi to ksi → - 1 psi = 0.0068947573 megapascal [MPa]
psi to mpa →
- 1 pascal [Pa] = 0.0000098692 Standard atmosphere [atm]
pascal to atm → - 1 pascal [Pa] = 0.0075006168 torr [Torr]
pascal to torr → - 1 kilopascal [kPa] = 0.1450377380 psi
kpa to psi →
- 1 kilopascal [kPa] = 7.5006168270 torr [Torr]
kpa to torr → - 1 kilopascal [kPa] = 0.001 megapascal [MPa]
kpa to mpa → - 1 megapascal [MPa] = 10 bar
mpa to bar →
- 1 megapascal [MPa] = 0.1450377380 ksi
mpa to ksi → - 1 Standard atmosphere [atm] = 101325 pascal [Pa]
atm to pascal → - 1 Standard atmosphere [atm] = 1.01325 bar
atm to bar →
- 1 Standard atmosphere [atm] = 1013.25 millibar [mbar]
atm to millibar → - 1 torr [Torr] = 133.32236842 pascal [Pa]
torr to pascal → - 1 torr [Torr] = 0.0013332237 bar
torr to bar →
- 1 millibar [mbar] = 0.001 bar
millibar to bar → - 1 millibar [mbar] = 0.0145037738 psi
millibar to psi → - 1 millibar [mbar] = 0.1 kilopascal [kPa]
millibar to kpa →
- 1 ksi = 6894.7572932 kilopascal [kPa]
ksi to kpa → - 1 ksi = 6.8947572932 megapascal [MPa]
ksi to mpa → - 1 inch mercury (32°F) [inHg] = 3386.38 pascal [Pa]
inHg to pascal →
- 1 millimeter mercury (0°C) [mmHg] = 0.00133322 bar
mmHg to bar → - 1 millimeter mercury (0°C) [mmHg] = 0.0193368 psi
mmHg to psi → - 1 gigapascal [GPa] = 10000 bar
gpa to bar →
- 1 bar = 0.9869232667 Standard atmosphere [atm]
bar to atm → - 1 bar = 750.0616827 torr [Torr]
bar to torr → - 1 bar = 1000 millibar [mbar]
bar to millibar →
- 1 psi = 6894.7572932 pascal [Pa]
psi to pascal → - 1 psi = 6.8947572932 kilopascal [kPa]
psi to kpa → - 1 psi = 0.0680459639 Standard atmosphere [atm]
psi to atm →
- 1 pascal [Pa] = 0.00001 bar
pascal to bar → - 1 pascal [Pa] = 0.0001450377 psi
pascal to psi → - 1 pascal [Pa] = 0.001 kilopascal [kPa]
pascal to kpa →
- 1 kilopascal [kPa] = 0.01 bar
kpa to bar → - 1 kilopascal [kPa] = 1000 pascal [Pa]
kpa to pascal → - 1 kilopascal [kPa] = 0.0098692327 Standard atmosphere [atm]
kpa to atm →
- 1 megapascal [MPa] = 145.0377380 psi
mpa to psi → - 1 megapascal [MPa] = 1000 kilopascal [kPa]
mpa to kpa → - 1 megapascal [MPa] = 1000000 pascal [Pa]
mpa to pascal →
- 1 Standard atmosphere [atm] = 14.6959488 psi
atm to psi → - 1 Standard atmosphere [atm] = 101.325 kilopascal [kPa]
atm to kpa → - 1 Standard atmosphere [atm] = 760.0000006 torr [Torr]
atm to torr →
- 1 torr [Torr] = 0.0193367747 psi
torr to psi → - 1 torr [Torr] = 0.0013157895 Standard atmosphere [atm]
torr to atm → - 1 millibar [mbar] = 100 pascal [Pa]
millibar to pascal →
- 1 ksi = 6894757.2932 pascal [Pa]
ksi to pascal → - 1 ksi = 68.9475729 bar
ksi to bar → - 1 ksi = 1000 psi
ksi to psi →
- 1 inch mercury (32°F) [inHg] = 0.0338638 bar
inHg to bar → - 1 inch mercury (32°F) [inHg] = 0.4911541 psi
inHg to psi → - 1 millimeter mercury (0°C) [mmHg] = 133.322 pascal [Pa]
mmHg to pascal →
- 1 gigapascal [GPa] = 145037.738 psi
gpa to psi → - 1 gigapascal [GPa] = 1000 megapascal [MPa]
gpa to mpa → - 1 gigapascal [GPa] = 1000000 kilopascal [kPa]
gpa to kpa →