Pressure Converter — Pa, bar, PSI, atm, mmHg, kPa
Convert pressure between Pascal, bar, PSI, atm, mmHg, and kPa instantly. Shows formula used for each conversion.
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Formula Used
All Units
Pressure Unit Reference
| Unit | Symbol | In Pascals | Common Use |
|---|---|---|---|
| Pascal | Pa | 1 | SI base unit, engineering |
| Kilopascal | kPa | 1,000 | Weather reports, medical |
| Bar | bar | 100,000 | Industrial, meteorology |
| PSI | psi | 6,894.76 | Tires, hydraulics (US) |
| Atmosphere | atm | 101,325 | Reference standard |
| mmHg / Torr | mmHg | 133.322 | Blood pressure, vacuum |
Frequently Asked Questions
What is Pascal (Pa) and how does it relate to other pressure units?
Pascal is the SI unit of pressure. 1 Pa = 1 N/m². It is the base unit. 1 bar = 100,000 Pa; 1 atm = 101,325 Pa; 1 PSI = 6,894.76 Pa; 1 mmHg = 133.322 Pa; 1 kPa = 1,000 Pa.
What is standard atmospheric pressure?
Standard atmospheric pressure (1 atm) equals 101,325 Pa, 101.325 kPa, 1.01325 bar, 14.696 PSI, or 760 mmHg. This is the average pressure at sea level.
What is PSI used for?
PSI (pounds per square inch) is commonly used in the US and UK for tire pressure, hydraulic systems, and industrial applications. Typical car tire pressure is 30–35 PSI.
What is mmHg used for?
mmHg (millimetres of mercury) is used in medicine for blood pressure and in meteorology. Normal blood pressure is around 120/80 mmHg. Normal atmospheric pressure is 760 mmHg.
What is the difference between gauge pressure and absolute pressure?
Absolute pressure is measured relative to a perfect vacuum. Gauge pressure is measured relative to atmospheric pressure (gauge = absolute − 1 atm). Tire pressure gauges show gauge pressure.