Pressure Converter
Convert pressure units with the factor behind each answer. Check whether a reading is gauge or absolute, because the unit does not tell you.
1 bar = 14.50377377 psi
Common conversions
- 1 bar = 14.50377377 psi
- 1 psi = 0.06894757293 bar
- 1 kPa = 0.1450377377 psi
- 1 psi = 6.894757293 kPa
- 1 atm = 101.325 kPa
- 1 mmHg = 133.3223874 Pa
- 1 mH2O = 9.80665 kPa
Gauge and absolute pressure
Gauge pressure is measured from the surrounding atmosphere and absolute pressure from a vacuum. A tyre gauge reading of 2 bar is about 3 bar absolute at sea level. A unit conversion keeps the same reference.
Torr and mmHg
The torr is exactly 1/760 of a standard atmosphere, and conventional mmHg is defined from the density of mercury. They differ by about 0.000014%, which only matters in precise vacuum work.
Everyday ranges
Atmospheric pressure is about 1.013 bar. Equipment data sheets should say whether a pressure rating is gauge or absolute.
Unit factors
Every unit in terms of the base unit shown. To convert, multiply by the factor of the unit you have and divide by the factor of the unit you want.
| Unit | Equals | What it is |
|---|---|---|
| Pa | 1 Pa | Pascal, one newton per square metre. The SI unit of pressure. |
| hPa | 100 Pa | Hectopascal, equal to one millibar. Weather pressure. |
| kPa | 1,000 Pa | Kilopascal. |
| MPa | 1,000,000 Pa | Megapascal, a million pascals. |
| mbar | 100 Pa | Millibar, equal to one hectopascal. |
| bar | 100,000 Pa | Bar, exactly 100,000 Pa. Close to atmospheric pressure. |
| atm | 101,325 Pa | Standard atmosphere, exactly 101,325 Pa. |
| psi | 6,894.757293 Pa | Pound-force per square inch. |
| mmHg | 133.3223874 Pa | Millimetre of mercury (conventional), 133.322387415 Pa. Vacuum and blood pressure. |
| inHg | 3,386.38864 Pa | Inch of mercury (conventional), 25.4 mmHg. |
| torr | 133.3223684 Pa | Torr, exactly 1/760 of a standard atmosphere. Very close to, but not exactly, one mmHg. |
| kgf/cm² | 98,066.5 Pa | Kilogram-force per square centimetre, an older industrial unit. Close to 1 bar. |
| mH2O | 9,806.65 Pa | Metre of water column (conventional), 9,806.65 Pa. Pump head and tank levels. |
Conversion pages
bar to psipsi to barkPa to psipsi to kPa
Frequently asked questions
What is the formula to convert bar to psi?
psi = bar × 14.50377377. For example, 6 bar is 87.02264264 psi.
How do I convert psi back to bar?
bar = psi × 0.06894757293. The Swap button above reverses the direction for any pair of units.
Related
Conversion CentreElectrical Unit ConverterBattery Capacity ConverterPower ConverterEnergy ConverterVoltage ConverterCurrent ConverterResistance ConverterFrequency ConverterCapacitance ConverterInductance ConverterAngle ConverterPercent and PPM ConverterLength ConverterArea ConverterVolume ConverterMass and Weight ConverterForce and Torque ConverterTemperature ConverterFlow Rate ConverterMagnetic Flux Density ConverterIlluminance and Luminance ConverterDensity ConverterRotational Speed ConverterThermal Conductivity ConverterTemperature Difference ConverterSpecific Heat Converter