When operating pneumatic tools or sizing a new air compressor, understanding working pressure is just as important as knowing your airflow. If you are comparing North American and European specifications, using a reliable psi to bar converter is essential. While the US typically uses psi (Pounds per Square Inch), most overseas machinery utilizes bar or MPa (MegaPascals).
Air Pressure Converter
Use our interactive tool above to instantly calculate the exact equivalent across all major industrial standards.
The Difference Between Airflow and Air Pressure
A common mistake in pneumatic system design is confusing airflow with air pressure:
- Airflow (CFM / m³/h): The volume of air the compressor can deliver. It determines how many tools you can run at the same time. (Need to calculate this? Use our CFM to m³/h Converter).
- Air Pressure (psi / bar): The force of the delivered air. It determines how strong the tool will operate (e.g., the torque of an impact wrench or the force of a pneumatic cylinder).
If your compressor delivers high airflow but insufficient pressure, your tools will lack the power to do the job.
How to Convert psi to bar (Formula)
If you prefer doing the math manually instead of using our psi to bar converter, you can translate your North American psi rating into metric bar using a simple multiplier.
Formula:
bar = psi × 0.0689476
Example:
If your shop compressor runs at standard 116 psi, what is the metric equivalent?
- 116 × 0.0689476 = ~8.0 bar
How to Convert bar to psi (Formula)
Conversely, if you purchase an imported air compressor rated in metric units and need to know if it can power your American-made air tools, use this formula.
Formula:
psi = bar × 14.5038
Example:
If an industrial rotary screw compressor produces a maximum pressure of 10 bar:
- 10 × 14.5038 = ~145 psi
Understanding MPa (MegaPascals)
In advanced engineering datasheets and modern ISO specifications, you will frequently see MPa. The conversion here is straightforward, as MPa and bar are directly related within the metric system.
- 1 bar = 0.1 MPa
- 10 bar = 1.0 MPa
If a compressor is rated at 0.8 MPa, it means it operates at 8 bar (or about 116 psi).
Quick Reference: Industrial Compressor Pressures
Here is a cheat sheet of the most common operating pressures found in industrial air compressors and pneumatic networks:
| Imperial (psi) | Metric (bar) | Metric (MPa) | Typical Application |
| 90 psi | 6.2 bar | 0.62 MPa | Standard handheld air tools |
| 100 psi | 6.9 bar | 0.69 MPa | General workshop pneumatics |
| 116 psi | 8.0 bar | 0.80 MPa | Standard industrial machinery |
| 145 psi | 10.0 bar | 1.00 MPa | Heavy duty manufacturing / CNC |
| 175 psi | 12.0 bar | 1.20 MPa | Tire shops / High-pressure tools |
| 217 psi | 15.0 bar | 1.50 MPa | Laser cutting / Specialized tools |
Frequently Asked Questions (FAQ)
What is the PSI of 1 BAR?
1 BAR is equal to exactly 14.5038 PSI.
Is 14.7 PSI 1 BAR?
Close, but not exactly. 1 BAR is 14.5038 PSI. 14.7 PSI is actually equal to 1 Atmosphere (atm), which is the standard atmospheric pressure at sea level.
What is 100 PSI to BAR?
100 PSI converts to roughly 6.89 BAR.
What is a normal PSI for an air compressor?
For most standard pneumatic tools, 90 to 100 PSI (6.2 to 6.9 BAR) is required at the tool inlet. To account for pressure drops in the pipework, the air compressor is usually set to run between 115 and 125 PSI (8.0 to 8.6 BAR).
Need a compressor that matches your required pressure? Finding the right balance between psi and CFM is critical for energy efficiency. If you need help selecting a unit, browse our catalog of industrial air compressors or contact our engineering team for sizing assistance.