Pressure
Pa, bar, PSI, atm
About This Calculator
Pressure is force applied per unit area. Pascals are the SI unit used in science and meteorology, bar is common in Europe, PSI (pounds per square inch) is standard for tires and plumbing in the US, and atmospheres represent the pressure of air at sea level.
Formula
1 atm = 101,325 Pa = 1.01325 bar = 14.696 PSI
1 bar = 100,000 Pa = 14.5038 PSI
1 PSI = 6,894.76 Pa = 0.0689476 bar
Example Calculation
Convert car tire pressure 32 PSI to bar and Pa.
- bar = 32 × 0.0689476 = 2.207 bar
- Pa = 32 × 6894.76 = 220,632 Pa
32 PSI = 2.207 bar = 220,632 Pa
Reference Pressure Values
| Context | atm | bar | PSI | Pa |
|---|---|---|---|---|
| Sea level (1 atm) | 1 | 1.013 | 14.70 | 101,325 |
| Car tire (typical) | 2.2 | 2.2 | 32 | 220,632 |
| Bike tire (road) | 7 | 7.0 | 101.5 | 700,000 |
| Blood pressure sys | 1.16 | 1.17 | 17.4 | 116,000 |
Frequently Asked Questions
What is the difference between PSI and bar?
PSI (pounds per square inch) and bar are both pressure units. 1 bar = 14.504 PSI. Bar is commonly used in Europe; PSI is standard in the US for tires and industrial equipment.
What is standard atmospheric pressure?
Standard atmospheric pressure is 1 atm = 101,325 Pa = 1.01325 bar = 14.696 PSI. This is the average air pressure at sea level.
Why is gauge pressure different from absolute pressure?
Gauge pressure measures relative to atmospheric pressure; absolute pressure includes atmospheric pressure. A tire gauge reads gauge pressure — 0 PSI means flat, not vacuum. Absolute = gauge + 14.7 PSI.