Pressure Converter
Enter a pressure reading below to convert between PSI, bar, Pascals, and atmospheres.
Convert Pressure
Enter a value and select the units to convert between bars, psi, and kilopascals.
You can change the units using the dropdowns above or click on a unit button.
Common Pressure Reference Points
Here are some common pressure values in Bar (bar), Pounds per Square Inch (psi), and Kilopascal (kPa). Click any preset value or arrow to load it into the converter.
| Description | Bar (bar) | Pounds per Square Inch (psi) | Kilopascal (kPa) |
|---|---|---|---|
| Standard atmospheric pressure (1 atm) | 1.01325 | 14.69595 | 101.325 |
| 1 Bar metric benchmark (100 kPa) | 1 | 14.50377 | 100 |
| Passenger car tire (~2.2 bar / 32 PSI) | 2.2 | 31.9083 | 220 |
| Residential water line (~4 bar) | 4 | 58.0151 | 400 |
| Road bike tire (~6.9 bar / 100 PSI) | 6.89476 | 100.00004 | 689.476 |
| Scuba tank full (~200 bar) | 200 | 2,900.75475 | 20,000 |
Pressure Conversion Formulas
Use the following formulas to convert between bars, psi, and kilopascals.
1 bar equals exactly 100,000 Pascals (100 kPa), and 1 standard atmosphere (atm) equals 101.325 kPa.
More Bar & Pounds per Square Inch Conversions
Convert from Bars
Frequently Asked Questions
All Pressure Conversion Calculators (24)
Select any dedicated pressure pair below for worked examples and printable tables
Category Conversion Matrix
Simultaneous comparison of 21 units in this category
Pressure Unit Definitions & Symbols
Pascal (Pa)
SISI derived unit of pressure equal to 1 Newton per square meter (N/m²).
Kilopascal (kPa)
METRICEqual to 1,000 Pascals (1 kN/m²).
Megapascal (MPa)
SIEqual to 1,000,000 Pascals (identically 1 N/mm²).
Gigapascal (GPa)
SIEqual to 1,000,000,000 Pascals (1,000 MPa), used for elastic modulus of metals and diamond.
Terapascal (TPa)
SIEqual to 10¹² Pascals.
Hectopascal (hPa)
METRICEqual to 100 Pascals (identical to 1 millibar).
Millipascal (mPa)
METRICOne-thousandth of a Pascal.
Micropascal (µPa)
METRICOne-millionth of a Pascal, reference standard in acoustics.
Bar (bar)
METRICMetric pressure unit equal to 100,000 Pascals (100 kPa).
Millibar (mbar)
METRICMeteorological pressure unit equal to 1/1000 of a bar (100 Pa = 1 hPa).
Pounds per Square Inch (psi)
IMPERIALImperial & US pressure unit equal to 1 pound-force per square inch (6.89476 kPa).
Kilopounds per Square Inch (ksi) (ksi)
US CUSTOMARYMaterials engineering yield strength unit equal to 1,000 PSI (6.89476 MPa).
Pounds per Square Foot (psf) (psf)
IMPERIALEqual to 1/144 PSI (47.88 Pascals), used in aerodynamic and structural wind loading.
Standard Atmosphere (atm)
OTHERStandard sea-level atmospheric pressure defined as 101,325 Pascals.
Torr (mmHg) (Torr)
OTHER1/760 of a standard atmosphere (133.3224 Pascals).
Inch of Mercury (inHg) (inHg)
US CUSTOMARYAviation altimeter & weather barometer unit equal to 3,386.389 Pascals.
Inch of Water Column (inH₂O) (inH₂O)
US CUSTOMARYHVAC duct static pressure unit equal to 249.089 Pascals.
Foot of Water Head (ftH₂O) (ftH₂O)
US CUSTOMARYPump head pressure unit equal to 12 inches of water (2.989 kPa).
Kilogram-force per Sq Cm (kgf/cm²)
METRICTechnical atmosphere equal to 98,066.5 Pascals (14.2233 PSI).
Kilogram-force per Sq Meter (kgf/m²)
METRICEqual to 9.80665 Pascals.
Dyne per Square Centimeter (Barye) (dyn/cm²)
METRICCGS pressure unit equal to 0.1 Pascals.
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standards — Pascal (Pa), Kilopascal (kPa) & Megapascal (MPa)
- [2]NIST CUU ReferenceNIST CUU (Derived SI Unit: Pascal (Pa))·International Reference Specification for Pressure & Mechanical Stress
- [3]BIPM TablesBIPM (SI Brochure (9th Ed.) — Mechanics)·Official Pressure Conversion Factors & Rounding Rules