Pressure Unit Converter
Convert between PSI, bar, Pascal, kPa, MPa, atm, and 20+ pressure units for engineering, HVAC, hydraulics, and scientific applications.
Pressure Converter
Comprehensive pressure unit conversion with engineering applications and measurement principles
Pressure Conversion
Conversion Result
14.503768
psi (Pounds per Square Inch)
1 bar = 14.503768 psi
Conversion Factor:
1 bar = 1.4504e+1 psi
Unit Categories:
Common Unit Conversions
| Unit | Symbol | Value | Scientific |
|---|---|---|---|
| Pascal | Pa | 100000.000000 | 1.000e+5 |
| Kilopascal | kPa | 100.000000 | 1.000e+2 |
| Megapascal | MPa | 0.100000 | 1.000e-1 |
| Bar | bar | 1.000000 | 1.000e+0 |
| Pounds per Square Inch | psi | 14.503768 | 1.450e+1 |
| Standard Atmosphere | atm | 0.986923 | 9.869e-1 |
| Millimeters of Mercury | mmHg | 750.063755 | 7.501e+2 |
| Torr | torr | 750.063755 | 7.501e+2 |
Pressure Unit Conversion Reference Table
| Unit | PSI | Bar | Atm | kPa |
|---|---|---|---|---|
| 1 Pascal (Pa) | 0.000145 | 0.00001 | 0.00000987 | 0.001 |
| 1 Kilopascal (kPa) | 0.14504 | 0.01 | 0.00987 | 1 |
| 1 Bar | 14.504 | 1 | 0.9869 | 100 |
| 1 PSI | 1 | 0.0689 | 0.068 | 6.895 |
| 1 Atmosphere (atm) | 14.696 | 1.01325 | 1 | 101.325 |
| 1 MPa (megapascal) | 145.04 | 10 | 9.869 | 1000 |
Common Pressure Unit Applications
Automotive
• Tire pressure: 30-35 PSI (2.0-2.4 bar)
• Engine oil pressure: 25-65 PSI
• Fuel injection: 40-60 PSI
• Brake hydraulics: 1,000-2,000 PSI
HVAC & Refrigeration
• Refrigerant low side: 20-70 PSI
• Refrigerant high side: 150-400 PSI
• Duct static pressure: 0.1-2 in. WC
• Gas line pressure: 0.25-2 PSI
Industrial Hydraulics
• Light duty hydraulics: 1,000-2,000 PSI
• Heavy equipment: 3,000-5,000 PSI
• High pressure systems: up to 10,000 PSI
• Pneumatics: 80-150 PSI
Medical & Scientific
• Blood pressure: 80-120 mmHg
• Oxygen therapy: 50-60 PSI
• Autoclave sterilization: 15-30 PSI
• Laboratory gas: 10-100 PSI
Frequently Asked Questions
What is the difference between PSI and bar?
1 bar = 14.504 PSI (pounds per square inch). Bar is commonly used in Europe and Asia for industrial and scientific applications. PSI is the standard in the United States and UK for tire pressure, hydraulic systems, and many industrial applications. Both measure the same physical quantity (force per area).
What is standard atmospheric pressure?
Standard atmospheric pressure at sea level is: 1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.696 PSI. This is used as a reference point in many scientific and engineering calculations. Actual atmospheric pressure varies with altitude and weather.
What pressure unit is used for tire pressure?
In the USA: PSI (pounds per square inch) — car tires typically 30-35 PSI. In Europe: bar — 2.0-2.5 bar is common. In SI countries: kPa is also used. 2.2 bar = 32 PSI = 220 kPa, for reference.
When should I use Pascal vs bar vs PSI?
Use Pascal (Pa) or kPa for scientific and SI-standard calculations. Use bar for industrial equipment in EU/Asia or when working with weather/atmospheric data. Use PSI for US industrial equipment, tire pressure, HVAC. Use MPa (megapascal) for high-pressure hydraulic systems and material strength specifications.
What is gauge pressure vs absolute pressure?
Absolute pressure is measured relative to a perfect vacuum (zero pressure). Gauge pressure is measured relative to atmospheric pressure. Gauge pressure = Absolute pressure − Atmospheric pressure. Tire pressure gauges read gauge pressure — "32 PSI" means 32 PSI above atmospheric, so absolute pressure is about 46.7 PSI.