Pressure Converter

The Pressure Converter converts between bar, PSI (pounds per square inch), atmosphere (atm), kilopascal (kPa), megapascal (MPa), millimetres of mercury (mmHg) and Torr — the most common pressure units used in engineering, medicine, meteorology and everyday applications. One standard atmosphere equals exactly 101,325 pascals, 14.696 PSI, 1.01325 bar or 760 mmHg (Torr). Understanding pressure unit conversions prevents costly measurement errors in technical and safety-critical contexts.

PSI is the dominant unit in the United States for tyre pressure (typically 32 to 35 PSI for passenger cars), hydraulic systems and plumbing. Bar and kPa are preferred in Europe and most of the world. Blood pressure is measured in mmHg globally — a reading of 120/80 mmHg represents 120 millimetres of mercury systolic over 80 diastolic. Atmospheric pressure for weather forecasting uses hectopascals (hPa) or millibars (1 mbar = 1 hPa = 0.1 kPa). Deep sea diving requires pressure awareness in atmospheres — every 10 metres of seawater adds approximately 1 atmosphere of pressure.

For industrial and engineering work, pressure ranges vary enormously: vacuum cleaners operate at slightly below 1 bar, fire sprinkler systems at 2 to 8 bar, hydraulic presses at 100 to 700 bar, and high-pressure water cutting at up to 6,000 bar. Use our Unit Converter for other physical unit conversions and our Temperature Converter for related thermodynamic calculations. Free, no registration required.