Divide PSI by 14.5. For example, 100 PSI ≈ 6.9 bar.
Pressure is one of the most misunderstood specifications in compressed air systems. Many assume higher pressure equals better performance, but that’s not always true.
Pressure Basics
Pressure vs Flow
Pressure gives force; flow gives volume. High pressure with insufficient flow still results in poor tool performance.
Bar and PSI Conversions
- 1 bar ≈ 14.5 PSI
- Typical shop compressors: 6–7 bar (≈ 90–100 PSI).
Selecting the Right Pressure
Do You Really Need More Pressure?
Single-stage piston: Up to 8 bar; two-stage: 10–12 bar; screw compressors: stable pressure.
Pressure Drops
Filters, dryers, and regulators cause pressure loss. Plan for 0.3–0.5 bar drop.
Frequently Asked Questions
Not necessarily. Most tools operate efficiently at 6–7 bar.
Typically 0.3–0.5 bar across filters and dryers.
