Pressure Converter

Pressure conversion translates a value between SI units (Pa, hPa, kPa), meteorological/atmospheric units (bar, atm), the US psi, and mmHg/Torr used in medicine and weather. This tool converts every unit through a common pascal (Pa) base so any pair can be computed instantly.

Enter a value, choose the from and to units, and the result updates automatically. Use Swap units to flip the two selections.

Result = value × (from-unit Pa) ÷ (to-unit Pa)

Common conversions: 1 atm = 101,325 Pa = 760 mmHg; a 32 psi tire pressure is about 220.6 kPa.

Pressure is physically a single concept, but each field settled on its own conventional unit. Auto mechanics use psi (pounds per square inch), meteorology uses hPa (hectopascal, identical to mbar), and hospital blood-pressure monitors use mmHg (millimeters of mercury). Each industry simply kept the instrument or convention it was already using when its standard was set, so identical physical pressures become hard to compare once shown in different units.

Convert a typical car tire's pressure (say, 32-35 psi) into weather units and you get 2,206-2,413 hPa — more than double standard atmospheric pressure (1,013.25 hPa) as seen on a weather report. A blood pressure of 120/80 mmHg converts to about 16.0/10.7 kPa; the numbers look like entirely different pressures, but they're directly comparable. Even a strong typhoon's central pressure, which can drop to around 950 hPa, can be converted instantly into psi, atm or any other unit with this tool.