Pressure Conversions

pressure conversions
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Select a unit of pressure

What is pressure?

Pressure is the force exerted on a specific area (pressure = force / area). The standard derived unit of pressure in the International System of Units (SI) is the pascal (Pa). Common units of pressure include atmospheres (atm), technical atmospheres (at), bars (bar), millibars (mbar), millimeters of mercury (mmHg), centimeters of water (cmH2O), inches of water (inH2O), kilopascals (kPa), pounds per square inch (psi), pounds per square foot (psf) and torr (Torr).

Common pressure conversions

  • 1 pascal (Pa) = 10-5 bar (bar) = 9.8692x10-6 atmospheres (atm)
  • 1 atmosphere (atm) = 1.0332 technical atmospheres (at) = 760 torr (Torr)
  • 1 pound per square inch (psi) = 6.895x103 pascals (Pa) = 68.046x10-3 atmospheres (atm)
  • 1 torr (Torr) = 133.322 pascals (Pa) = 1 millimeter of mercury (mmHg)
  • 1 bar (bar) = 105 pascals (Pa) = 0.98692 atmospheres (atm)
  • 1 technical atmosphere (at) = 735.56 torr (Torr)

Subdivisions and multiples of the pascal using SI prefixes

Subdivisions of the pascal Multiples of the pascal
Name Symbol Value Name Symbol Value
decipascal dPa 10-1 Pa decapascal daPa 101 Pa
centipascal cPa 10-2 Pa hectopascal hPa 102 Pa
millipascal mPa 10-3 Pa kilopascal kPa 103 Pa
micropascal μPa 10-6 Pa megapascal MPa 106 Pa
nanopascal nPa 10-9 Pa gigapascal GPa 109 Pa
picopascal pPa 10-12 Pa terapascal TPa 1012 Pa
femtopascal fPa 10-15 Pa petapascal PPa 1015 Pa
attopascal aPa 10-18 Pa exapascal EPa 1018 Pa
zeptopascal zPa 10-21 Pa zettapascal ZPa 1021 Pa
yoctopascal yPa 10-24 Pa yottapascal YPa 1024 Pa