PSI to Bar Calculator – Pressure Conversion
Convert pressure between PSI, bar, kPa, MPa, atm, and torr
Table of Contents
How to Use
- Enter the pressure value you want to convert
- Select the source pressure unit (psi, bar, kPa, MPa, atm, torr)
- Select the target pressure unit
- Click calculate to see the conversion result
- View all equivalent pressure values in different units
Common Pressure Units
Pressure is measured in various units depending on the application and region. Understanding these units is essential for accurate measurements and conversions.
- PSI (Pounds per Square Inch): Common in the US for tire pressure and compressed air systems
- Bar: Widely used in Europe and for industrial applications
- Kilopascal (kPa): Standard SI unit for pressure measurements
- Megapascal (MPa): Used for high-pressure applications
- Atmosphere (atm): Represents average atmospheric pressure at sea level
- Torr: Used in vacuum measurements and scientific applications
Key Conversion Ratios
| Unit | Equivalent in PSI | Equivalent in Bar |
|---|---|---|
| 1 PSI | 1.000 | 0.069 |
| 1 Bar | 14.504 | 1.000 |
| 1 kPa | 0.145 | 0.010 |
| 1 atm | 14.696 | 1.013 |
| 1 Torr | 0.019 | 0.001 |
Common Applications
- Tire pressure: Typically 30-35 PSI for passenger cars
- Hydraulic systems: Often rated in bar or PSI
- Weather: Atmospheric pressure in millibars or inches of mercury
- Industrial processes: Various units depending on industry standards
- Medical equipment: Often calibrated in kPa or mmHg (torr)
Frequently Asked Questions
- What's the difference between PSI and bar?
- PSI (pounds per square inch) is primarily used in the United States, while bar is more common in Europe and industrial applications. 1 bar equals approximately 14.5 PSI.
- Why are there so many pressure units?
- Different pressure units evolved from different measurement systems and applications. Some are more convenient for certain ranges or types of measurements.
- What's atmospheric pressure in different units?
- Standard atmospheric pressure at sea level is approximately 14.7 PSI, 1.013 bar, 101.3 kPa, 0.101 MPa, 1.0 atm, or 760 torr.
- How do I check tire pressure correctly?
- Check tire pressure when tires are cold, use a reliable pressure gauge, and follow the manufacturer's recommended pressure found on the driver's door jamb or owner's manual.