Unit Conversion

Convert numbers between two units quickly and precisely

Pressure Converter

Unit Conversion

Convert pressure units: pascal, bar, PSI, and millibar

Pressure is stated in different units internationally: pascal (Pa) as the SI unit, bar and millibar (mbar) in Europe, PSI (pound-force per square inch) in the US, standard atmosphere (atm), and technical atmosphere (at). Torr and millimeters of mercury (mmHg) are mainly used in medicine and chemistry.

Key conversion factors:

  • 1 bar = 100,000 pascal (Pa) = 1,000 hectopascal (hPa)
  • 1 standard atmosphere (atm) = 101,325 pascal – average air pressure at sea level
  • 1 technical atmosphere (at) = 98,066.5 pascal ≈ 0.981 bar – defined as 1 kgf per cm²
  • 1 PSI = 6,894.76 pascal ≈ 0.0689 bar
  • 1 millibar (mbar) = 1 hectopascal (hPa) – common unit in meteorology
  • 1 torr ≈ 1 mmHg = 133.32 pascal – both practically identical
  • 1 megapascal (MPa) = 10 bar – common for material property values

Applications:

  • Tire pressure: converting between bar (Europe) and PSI (US), e.g. 2.5 bar equals 36 PSI
  • Meteorology: air pressure readings in hectopascal, standard pressure at 1,013 hPa
  • Medicine: blood pressure measurement in mmHg or torr
  • Hydraulics & pneumatics: operating pressures of technical systems in bar and megapascal

The pressure converter helps with adjusting tire pressure, interpreting weather data, and comparing technical specs.

Frequently asked questions about converting pressure

1 bar equals about 14.5 PSI, so 2.5 bar equals about 36 PSI. This conversion matters because tire pressure is usually given in bar in Europe, but in PSI in the US.

1 standard atmosphere (atm) equals 1.01325 bar and is defined as the average air pressure at sea level. Bar, on the other hand, is a round, easy-to-handle unit (1 bar = 100,000 pascal) with no physical relation to air pressure.

Yes, practically identical: 1 torr equals 133.32 pascal, exactly the same as 1 millimeter of mercury (mmHg). Both units are frequently used in medicine, for example for blood pressure measurement.