Pressure Converter — From Pascal to PSI
Pressure is force per unit area. It is measured in many different units depending on the field: physics uses Pascals, engineering uses PSI, meteorology uses millibars, and medicine uses mmHg (torr). Our pressure converter translates between all of them instantly.
Common Pressure Units Explained
- Pascal (Pa): The SI unit. 1 Pa = 1 Newton per square meter. Standard atmospheric pressure = 101,325 Pa.
- Bar: 1 bar = 100,000 Pa. Used in meteorology and tire pressure in Europe.
- Atmosphere (atm): Defined as 101,325 Pa, the average atmospheric pressure at sea level.
- PSI (Pounds per Square Inch): Used in the USA for tire pressure, hydraulics, and engineering. 1 atm ≈ 14.7 PSI.
- Torr (mmHg): Used in medicine (blood pressure), vacuum systems, and chemistry. 1 atm = 760 torr.
- Millibar (mbar): Used in weather forecasting and aviation. 1 mbar = 100 Pa. Standard pressure = 1013.25 mbar.
Quick Reference Pressure Facts
- Standard atmospheric pressure at sea level: 101.325 kPa = 1 atm = 1013.25 mbar = 14.7 PSI
- Tire pressure (car): ~32–35 PSI (2.2–2.4 bar)
- Blood pressure (normal): 120/80 mmHg
- Scuba diving at 10m depth: ~2 atm
- Deep ocean (Mariana Trench, 11 km): ~1,100 atm
Practical Applications
- Automotive: Tire pressure (PSI or bar)
- Medicine: Blood pressure (mmHg), respiratory pressure
- Weather: Barometric pressure (mbar or inHg)
- Engineering: Hydraulic systems, gas cylinders