Pressure Converter
Convert between pressure units instantly: Pascal, kilopascal, bar, atmosphere, PSI, mmHg, inHg, and torr. Free, 100% in your browser.
Reference
How does pressure conversion work?
Pressure conversion uses fixed ratios between units. This tool converts through Pascal (Pa) as the SI base unit. 1 atm = 101,325 Pa exactly (standard atmosphere), 1 bar = 100,000 Pa, 1 PSI = 6,894.757 Pa, 1 mmHg ≈ 133.322 Pa, 1 inHg ≈ 3,386.389 Pa. Pascal is defined as one newton per square meter (N/m²).
Unit reference
SI: Pascal (Pa), kilopascal (kPa) — the standard scientific unit. Metric: bar — commonly used in Europe for tire pressure and weather. Standard: atmosphere (atm) — standard atmospheric pressure at sea level. Imperial: PSI (pounds per square inch) — used in the US for tire pressure and industrial applications. Medical: mmHg (millimeters of mercury) — used for blood pressure measurements. Aviation: inHg (inches of mercury) — used for altimeter settings.
Common use cases
Tire pressure — convert between PSI and bar for vehicle tires. Weather — convert barometric pressure between mbar, mmHg, and inHg. Medical — understand blood pressure readings in mmHg. Diving — calculate pressure at depth using atm or bar. Engineering — convert hydraulic and pneumatic system pressures.
Privacy
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