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Pressure Converter

Convert between pressure units: bar, atm, psi, mmHg, Pascal, kPa, hPa (mbar). Complete converter with all equivalences.

Sources: BIPM -- Bureau International des Poids et Mesures (SI) · ISO 80000-4 -- Quantities and units, Mechanics

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How the Pressure Converter Works

This tool instantly converts between the main pressure units used in physics, engineering, meteorology, and medicine.

Supported Pressure Units

  • Pascal (Pa): SI unit, 1 Pa = 1 N/m²
  • kiloPascal (kPa): 1 kPa = 1,000 Pa. Common for tire pressure and industrial use
  • hectoPascal (hPa) / millibar (mbar): 1 hPa = 100 Pa. Standard in meteorology
  • bar: 1 bar = 100,000 Pa. Used in industry and hydraulics
  • atmosphere (atm): 1 atm = 101,325 Pa. Standard atmospheric pressure at sea level
  • psi (pound per square inch): 1 psi = 6,894.76 Pa. US standard for tires and systems
  • mmHg / torr: 1 mmHg = 133.322 Pa. Used in medicine for blood pressure

Practical Applications

Tire pressure: recommended pressure is typically 30-35 psi (2.1-2.4 bar).

Weather: atmospheric pressure is reported in hPa (mbar). Standard is 1013.25 hPa. Values below 1000 hPa indicate low pressure (storms), above 1025 hPa high pressure (fair weather).

Blood pressure: measured in mmHg. Normal values: 120/80 mmHg.

Frequently Asked Questions

How many bar is 1 atmosphere?▼
1 standard atmosphere (atm) equals 1.01325 bar. This is the atmospheric pressure at sea level at 0 degrees C. In practice, 1 atm and 1 bar differ by about 1.3%, so they are often considered approximately equal.
How do you convert psi to bar?▼
To convert psi to bar, multiply by 0.0689476. For example, 30 psi = 30 x 0.0689476 = 2.068 bar. PSI is used in the United States, while bar is more common in Europe.
What is the difference between hPa and mbar?▼
There is no difference: 1 hPa (hectoPascal) = 1 mbar (millibar). Both equal 100 Pascal. The hPa is preferred by the World Meteorological Organization (WMO), while mbar was the earlier term.