Convert between Pascal, PSI, bar, atmosphere, and other pressure units.
0 Pa
Convert between different pressure units including Pascal, PSI, bar, atmosphere, and mmHg. Essential for physics, engineering, meteorology, and industrial applications. Get instant conversions between any pressure units.
| Unit | Abbreviation | To Pascal | Common Use |
|---|---|---|---|
| Pascal | Pa | 1 | SI unit |
| PSI | psi | 6,894.76 | Tire pressure |
| Bar | bar | 100,000 | Weather, industry |
| Atmosphere | atm | 101,325 | Sea level reference |
| Millimeters Mercury | mmHg | 133.322 | Blood pressure |
Absolute pressure is measured from perfect vacuum (0 Pa). Gauge pressure is measured from atmospheric pressure. Most tire gauges show gauge pressure.
Most car tires should be 32-35 psi. Check your vehicle's door jamb for the exact specification. Don't use the maximum pressure shown on the tire.
Historical reason: early blood pressure measurements used mercury manometers. Modern units use mmHg to maintain consistency with medical standards.