Pressure Converter

The Pressure Converter allows you to convert between seven commonly used pressure units: Pascal, bar, PSI, atmosphere, torr, millimeters of mercury, and kilopascal. Pressure measurements are fundamental in engineering, physics, meteorology, medicine, and many industrial applications, and different fields have settled on different preferred units.

PSI (pounds per square inch) is the standard pressure unit in the United States for tire pressure, hydraulic systems, and industrial applications. Bar is widely used in Europe and in meteorology. The Pascal is the SI unit of pressure, equal to one newton per square meter, with kilopascal being the more practical unit for everyday values. The atmosphere (atm) represents standard atmospheric pressure at sea level. Torr and mmHg are nearly identical units commonly used in vacuum science and medical blood pressure measurements.

The converter uses Pascal as the internal base unit. Every input is first converted to Pascals, then converted from Pascals to the target unit. This approach through a common base ensures consistent and accurate results for all 42 possible unit-pair conversions. The conversion factors are based on exact definitions where available and widely accepted standard values otherwise.

All processing runs entirely in your browser. No data is sent to any server, so your inputs remain private. Results are displayed with up to six significant decimal places, with trailing zeros removed for clean readability.