🔩 Pressure Converter
Free online pressure converter. Convert between pascals, kilopascals, bar, PSI, atmospheres, torr and millimeters of mercury.
Conversion Reference Table
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Pressure Conversion Guide
Pressure is the force applied per unit area. The SI unit of pressure is the pascal (Pa), named after Blaise Pascal. However, many other units are in common use: PSI (pounds per square inch) is used for tire pressure in the US, bar is used in Europe for tire pressure and industrial applications, atmospheres (atm) are used in science, and millimeters of mercury (mmHg) are used in medicine for blood pressure readings.
Standard atmospheric pressure at sea level is 101,325 Pa, or 1 atm, or 14.696 PSI, or 1.01325 bar. Tire pressure is typically 30–35 PSI (2.07–2.41 bar) for passenger cars. Blood pressure is measured in mmHg — a normal reading is around 120/80 mmHg.
Weather Pressure
Meteorologists typically use millibars (mbar) or hectopascals (hPa) for atmospheric pressure — these are equivalent units (1 mbar = 1 hPa = 100 Pa). Standard sea-level pressure is 1013.25 mbar. Low pressure systems (below ~1000 mbar) typically bring rain and storms, while high pressure (above ~1020 mbar) usually means fair weather.