# Pressure Conversions

pressure conversions
Select a unit of pressure

## What is pressure?

Definition: 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