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Pressure unit converter: pascal, atmosphere, bar, mmHg and PSI

Convert pressures between pascal, atmosphere, bar, millimetre of mercury (mmHg) and PSI (pound per square inch).

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Pascal

101325 Pa

Equivalents

Pascal101325 Pa
Atmosphere1 atm
Bar1.01325 bar
Millimetre of mercury759.9998917 mmHg
PSI (pound per square inch)14.69594878 psi

Converts the value to pascals with these equivalences:

  • 1 atm = 101,325 Pa
  • 1 bar = 100,000 Pa (≈ 0.987 atm)
  • 1 mmHg ≈ 133.322 Pa (760 mmHg ≈ 1 atm)
  • 1 PSI ≈ 6894.76 Pa (≈ 0.0689 bar)

Use cases

  • Converting tyre pressure between bar and PSI.
  • Reading blood pressure in mmHg.
  • Solving physics and chemistry problems in atmospheres and pascals.

How it works

  1. 1

    Type the amount

    Decimals with a dot or a comma are accepted, as are negative values.

  2. 2

    Pick the units

    Choose the source and target units; the result and the equivalents table update instantly.

Technical details

  • Tyre and gauge pressures are usually relative (above atmospheric); the conversion is the same, but don't mix gauge and absolute pressure.
  • The conventional mmHg (133.322387415 Pa) and the torr (101,325/760 Pa) differ by less than one part per million.
  • Results use 10 significant figures; very large or very small values are shown in scientific notation (e.g. 1e-10).

Frequently asked questions

How many PSI is 2 bar?

About 29 PSI.

What's the difference between bar and atmosphere?

They're almost equal: 1 atm = 1.01325 bar.

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