Pressure Conversion Calculator

Convert Pressure
Value to Convert:

What is Pressure?

Pressure is a scalar quality reflecting how force acts on a surface.

P = F/A

Where P is equal to pressure, F is the normal force and A is area. Since pressure is derived from force and area, many units for pressure directly relate force to area. Some are obvious, such as pounds per square inch, but even the SI standard Pascal is actually an expression of one Newton per square meter.

How to Convert Units of Pressure

Conversions are performed by using a conversion factor. By knowing the conversion factor, converting between units can become a simple multiplication problem:

S * C = E

Where S is our starting value, C is our conversion factor, and E is our end converted result.

To simply convert from any unit into pascals, for example, from 5 bar, just multiply by the conversion value in the right column in the table below.

5 bar * 100000 [ (Pa) / (bar) ] = 500000 Pa

To convert from Pa into units in the left column divide by the value in the right column or, multiply by the reciprocal, 1/x.

500000 Pa / 100000  [ (Pa) / (bar) ] = 5 bar

To convert among any units in the left column, say from A to B, you can multiply by the factor for A to convert A into Pascals then divide by the factor for B to convert out of Pascals.  Or, you can find the single factor you need by dividing the A factor by the B factor.

For example, to convert from bar to pounds per square inch you would multiply by 100000 then divide by 6894.757.  Or, multiply by 100000/6894.757 = 14.503774. So, to convert directly from kgf to ozf, you multiply by 14.503774.

Units, symbols and conversion values
used in this pressure calculator
To Convert from
and Convert to
( Pa )
Multiply by
( Pa / Unit )
atmosphere-standard atm pascal 101325
atmosphere-technical at pascal 98066.5
bar bar pascal 100000
decibar dbar pascal 1000
millibar mbar pascal 100
barye (cgs unit) barye pascal 0.1
centimeter of mercury cmHg pascal 1333.22
centimeter of water (4 °C) cmH2O pascal 98.0638
foot of mercury (conventional) ftHg pascal 40636.66
foot of water (39.2 °F) ftH2O pascal 2988.98
inch of mercury (conventional) inHg pascal 3386.389
inch of water (39.2 °F) inH2O pascal 248.082
kilogram-force per square millimeter kgf/mm2 pascal 9806650
kip per square inch kip/in2 pascal 6894757
millimeter of mercury mmHg pascal 133.3224
millimeter of water (3.98 °C) mmH2O pascal 9.80638
pascal Pa pascal 1
hectopascal hPa pascal 100
kilopascal kPa pascal 1000
pound per square foot lb/ft2 pascal 47.88025
pound per square inch lb/in2 or psi pascal 6894.757
poundal per square foot pdl/ft2 pascal 1.488164
short ton per square foot sh tn/ft2 pascal 95760.518
torr torr pascal 133.3224

References/ Further Reading

The National Institute of Standards and Technology (NIST) - The NIST Guide for the use of the International System of Units - Appendix B, subsections B.8 Factors for Units Listed Alphabetically and B.9 Factors for units listed by kind of quantity or field of science.

Lide, David R., Daniel (Editor-in-Chief). CRC Handbook of Chemistry and Physics, 89th Edition New York, NY: CRC Press, p. 1-28, 2008.

Wikipedia contributors. "Conversion of units" Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, last visited 26 Jun. 2011.

How Many? A dictionary of units of measurement at


Cite this content, page or calculator as:

Furey, Edward "Pressure Conversion Calculator" From - Online Calculator Resource.