Calculations and conversions of pressure units

Definition: Pressure or stress = force per area, p = F / A
F = force, A = area, p = pressure in Pa = N / m2 ≡ kg / (m · s2)

1 pascal = Pa ≡ 1 N · m−2 ≡ 1  J · m−3 ≡ 1  kg · m−1 · s−2 (N = newton)
FAQ: 1 megapascal = 1,000,000 pascals

Enter on the left side the unit and the known number. On the
right side you will get the calculated result with the adjusted unit.

 is: pounds per square inch atmospheres torrs bars millibars pascals kilopascals megapascals gigapascals pounds per square inch atmospheres torrs bars millibars pascals kilopascals megapascals gigapascals
To the Super Calculator for pressure units

Standard atmospheric (air) pressure is 101325 pascals = 1013.25 hPa = 101.325 kPa
Important to know: 1 Pa = 1 N/m294 dBSPL and 1 bar = 105 Pa.
1000 pascal (Pa) = 1 kilopascal (kPa).

Conversion of sound units: pascals to dBSPL

More conversions of pressure or stress units

 Unit Conversions and Comments pascal (Pa) (Pa = N / m2) N = Newton 1pascal (p = F / A) = the force F of 1 newton per square meter area (1 newton = the force, which is used to accelerate 1 kilogram to 1 meter per second squared) 1 Pa ≡ 1 kg/(m · s2). Force 1 N = 1 kg × m/s2. p = pressure; F = force; A = area 1 pascal = 10 dyne/cm2 = 0.01 mbar. 1 atm = 101325 pascal = 760 mm Hg = 760 torr = 14.696 psi. 1 Pa = 1 N / m² = 10−5 bar = 7.5×10−3 Torr = 0.987 atm = 1 Pa = 10 µbar. kilopascal (kPa) The prefix "kilo" means "1000", therefore is 1 kilopascal = 1000 Pa and 101.325 kPa = 1 atm = 760 torr and 100 kPa = 1 bar = 750 torr. megapascal (MPa) The prefix "mega" means "1000000", therefore is 1 megapascal = 1000 kPa = 1000000 Pa. These high pressures are very rare. gigapascal (GPa) The prefix "giga" means "1000000000", therefore is 1 gigapascal = 1000 MPa = 1000000 kPa = 1000000000 Pa = 9870 atm = 10000 bar. Pressures of some gigapascal can convert graphite to diamonds or can form from hydogenium a mtallic conductor. pounds per square inch (psi, PSI, lb/in2, lb/sq in) This unit is only used in the USA. Normal atmospheric pressure is 1 atm = 14.696 psi - that means, an air colum above us of an area of 1 square inch weighs 14.696 pounds. 1 lb/in2 = 6894.8 Pa =0.06895 bar 0,06804 atm = 51.715 Torr. atmosphere (atm) The normal air pressure is called "1 atmosphere". 1 atm = 14.6956 psi = 760 torr = 101325 Pa = 1.01325 bar. torr (Torr) Torricelli barometer design: One atmosphere pressure brings a colums of mercury in a Hg barometer to a height of 760 millimeter. The pressure, which brings a collum of mercury to 1 millimeter is called 1 Torr (1 mm Hg = 1 Torr).1 atm = 760 Torr = 14.696 psi. 1 Torr = 1/760 atm. bar (bar) The bar is nearly idendic to the atmosphere unit. 1 bar = 750.062 torr = 0.9869 atm = 100000 Pa. Normal air pressure = 1.01325 bar = 1013.25 mbar. millibar (mb or mbar) 1000 millibars are 1 bar. Meteorologists like this. 1 millibar = 0.001 bar = 0.750 Torr. 1 mbar = 100 Pa = 1 hectopascal. microbar (µb or µbar) 1 microbar is 10−6 bar = 1 dyne/cm². 1µbar = 0.1 Pa.

Pressure conversions

 from to multiply by atmosphere bar 1.01325 atmosphere dyne/cm2 = µbar 1.01325×106 atmosphere inch Hg 29.9213 atmosphere inch H2O 406.86 atmosphere kg/cm2 1.03325 atmosphere mbar 1013.25 atmosphere mtorr = micron Hg 7.6×105 atmosphere Pa = N/m2 1.01325×105 atmosphere PSI = lb/in2 14,696 atmosphere torr = mm Hg 760 bar atmosphere 0.98692 bar dyn/cm2 = µbar 1×106 bar inch Hg 29.54 bar inch H2O 401.65 bar kg/cm2 1.02 bar mbar 1000 bar mtorr = micron Hg 7.5028×105 bar Pa = N/m2 1×105 bar psi = lb/in2 14.503861 bar torr = mm Hg 750.2838 dyne/cm2 = µbar atmosphere 9.8692×10−7 dyne/cm2 = µbar bar 1×10−6 dyne/cm2 = µbar inch Hg 2.954×10−5 dyne/cm2 = µbar inch H2O 4.0165×10−4 dyne/cm2 = µbar kg/cm2 1.0200×10−6 dyne/cm2 = µbar mbar 1×10−3 dyne/cm2 = µbar mtorr = micron Hg 0.75028 dyne/cm2 = µbar Pa = N/m2 0.1 dyne/cm2 = µbar psi = lb/in2 1.4508×10−5 dyne/cm2 = µbar torr = mm Hg 7.5028×10−4 inch Hg atmosphere 3.342×10−2 inch Hg bar 3.385×10−2 inch Hg dyne/cm2 = µbar 3.385×104 inch Hg inch H2O 1.598 inch Hg kg/cm2 3.4532×10−2 inch Hg mbar 33.85 inch Hg mtorr = micron Hg 2.54×104 inch Hg Pa = N/m2 3385 inch Hg psi = lb/in2 0.4912 inch Hg torr = mm Hg 25.4 inch H2O atmosphere 2.458×10−3 inch H2O bar 2.489×10−3 inch H2O dyn/cm2 = µbar 2.489×103 inch H2O kg/cm2 2.5396×10−3 inch H2O inch Hg 7.354×10−2 inch H2O mbar 2.489 inch H2O mtorr = micron Hg 1.868×10−3 inch H2O Pa = N/m2 248,9 inch H2O psi = lb/in2 3.612×10−2 inch H2O torr = mm Hg 1.868 kg/cm2 atmosphere 0.9678 kg/cm2 bar 0.9804 kg/cm2 dyn/cm2 = µbar 9.804×105 kg/cm2 inch Hg 28.958 kg/cm2 inch H2O 393.76 kg/cm2 mbar 9.804×102 kg/cm2 mtorr = micron Hg 7.3554×105 kg/cm2 Pa = N/m2 9.804×104 kg/cm2 psi = lb/in2 14.223 kg/cm2 torr = mm Hg 7.355×102 mbar atmosphere 9.8692×10−4 mbar bar 0.001 mbar dyen/cm2 = µbar 1000 mbar kg/cm2 1.0200×10−3 mbar inch Hg 2.954×10−2 mbar inch H2O 0.4018 mbar mtorr = micron Hg 7.5028×102 mbar Pa = N/m2 100 mbar psi = lb/in2 1.450×10−2 mbar torr = mm Hg 0.75028 mtorr = micron Hg atmosphere 1.316×10−6 mtorr = micron Hg bar 1.3328×10−6 mtorr = micron Hg dyne/cm2 = µbar 1.3328 mtorr = micron Hg kg/cm2 1.3595×10−6 mtorr = micron Hg inch Hg 3.937×10−5 mtorr = micron Hg inch H2O 5.353×10−4 mtorr = micron Hg mbar 1.3328×10−3 mtorr = micron Hg Pa = N/m2 0.13328 mtorr = micron Hg psi = lb/in2 1.934×10−5 mtorr = micron Hg torr = mm Hg 1×10−3 Pa = N/m2 atmosphere 9.8692×10−6 Pa = N/m2 bar 1×10−5 Pa = N/m2 dyne/cm2 = µbar 10 Pa = N/m2 kg/cm2 1.020×10−5 Pa = N/m2 inch Hg 2.954×10−4 Pa = N/m2 inch H2O 4.018×10−3 Pa = N/m2 mbar 0.01 Pa = N/m2 mtorr = micron Hg 7.5028 Pa = N/m2 psi = lb/in2 1.4508×10−4 Pa = N/m2 torr = mm Hg 7.5028×10−3 psi = lb/in2 atmosphere 0.06805 psi = lb/in2 bar 0.0689472 psi = lb/in2 dyne/cm2 = µbar 6.89472×104 psi = lb/in2 kg/cm2 7.0309×10−2 psi = lb/in2 inch Hg 2.036 psi = lb/in2 inch H2O 27.68 psi = lb/in2 mbar 68.9472 psi = lb/in2 mtorr = micron Hg 5.171×104 psi = lb/in2 Pa = N/m2 6.89476×103 psi = lb/in2 torr = mm Hg 51.71 torr = mm Hg atmosphere 1.3158×10−3 torr = mm Hg bar 1.3328×10−3 torr = mm Hg dyn/cm2 = µbar 1.3328×10−3 torr = mm Hg kg/cm2 1.3595×10−3 torr = mm Hg inch Hg 3.937×10−2 torr = mm Hg inch H2O 0.5353 torr = mm Hg mbar 1.3328 torr = mm Hg mtorr = micron Hg 1000 torr = mm Hg Pa = N/m2 133.28 torr = mm Hg psi = lb/in2 1.934×10−2

Pressure conversion chart

 Pa bar N/mm2 kp/m2 kp/cm2(at) atm Torr 1 Pa (N/m2) = 1 10−5 10−6 0.102 0.102×10−4 0.987×10−5 0.0075 1 bar (daN/cm3) = 100000 1 0.1 10200 1.02 0.987 750 1 N/mm2 = 106 10 1 1.02×105 10.2 9.87 7500 1 mkp/m2 = 9.81 9.81×10−5 9.81×10−6 1 10−4 0.968×10−4 0.0736 1 kp/m2 (1 at) = 98100 0.981 0.0981 10000 1 0.968 736 1 atm (760 Torr) = 101325 1.013 0.1013 10330 1.033 1 760 1 Torr = 133 0.00133 1.33×10−4 13.6 0.00132 0.00132 1

Change in air pressure associated with the change in height

 Question: How does the air pressure change if the height changes 1 meter?   The hydrostatic pressure is calculated according to Blaise Pascal: This law is also assumed as an air column. Height h = 1 m Standard gravitational acceleration is g = 9.80665 m/s2 Density of air at 20°C is ρ20 = 1.204 kg/m3   1 m height changes the air pressure at a constant temperature of 20°C by p = ρ20 ∙ g ∙ h = 1.204 kg/m3 × 9.80665 m/s2 × 1 m = 11.8 Pa (N/m²) But the temperature decreases with height!

 1 Pa = 1 N/m2 10 µbar 10 dynes/cm2

 1 µbar = 0.1 N/m2 0.1 Pa 1 dynes/cm2