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Pressure Convertor

The pressure calculator converts pressure measurements between different pressure units.

There is also a table showing the conversion factors used in this calculator which dynmaically converts pressurce measurements to all defined measurement units.

Selecting a unit from the "Convert from" dropdown list displays a brief description of the measurement unit.

Pressure Converter
Value Convert from Convert to Value
Standard Atmosphere (atm) = typical air pressure at sea level

You can refine the calculations by controlling the number of decimal places that the calculator calculates to. The default is 2 decimal places.

Conversion Factors
Convert to
Convert from Atmosphere Bar Mercury (in Hg) Mercury (mm Hg) Pascal PSI Torr Water
Normal Technical
Atmosphere, standard 1.00 1.03 1.01 29.92 760.00 101325.00 14.70 760.00 406.79
Atmosphere, technical 0.97 1.00 0.98 28.96 735.56 98066.50 14.22 735.56 393.71
Bar 0.99 1.02 1.00 29.53 750.06 100000.00 14.50 750.06 401.47
Mercury (in Hg) 0.03 0.03 0.03 1.00 25.40 3386.38 0.49 25.40 13.60
Mercury (mm Hg) 0.00 0.00 0.00 0.04 1.00 133.32 0.02 1.00 0.54
Pascal 0.00 0.00 0.00 0.00 0.01 1.00 0.00 0.01 0.00
PSI 0.07 0.07 0.07 2.04 51.72 6894.76 1.00 51.72 27.68
Torr 0.00 0.00 0.00 0.04 1.00 133.32 0.02 1.00 0.54
Water 0.00 0.00 0.00 0.07 1.87 24.908 0.04 1.87 1.00

The pressure convertor calculates pressure using the following conversion factors:

1 standard atmosphere = 1.013250 x 105 Pascals

1 technical atmosphere = 9.806650 x 104 Pascals

1 Bar = 1 x 105 Pascals

1 Mercury (in Hg) = 3.38638 x 103 Pascals

1 Mercury (mm Hg) = 1.33322 x 102 Pascals

1 PSI = 6.894757 x 103 Pascals

1 Torr = 1.33322 x 102 Pascals

1 Inches of Water (in H2O) = 2.49082 x 102 Pascals

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