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Pressure Conversion Tools



The following conversion scripts courtesy of Tim Brice and Todd Hall of the National Weather Service in El Paso, TX;
modified by Bobby Graves - KB5HAV for use by the Hurricane Watch Net.

Pressure Unit Calculator
 Answers:
inches of mercury inches of mercury
millimeters of mercury (torr) millimeters of mercury (torr)
millibars millibars
hecto Pascals hecto Pascals
kilo Pascals kilo Pascals
pounds per square inch pounds per square inch
standard atmosphere standard atmosphere

Station Pressure Calculator
Enter the elevation of the station and choose your units: Station Pressure in inches of mercury:
feet meters in HG
Enter your altimeter setting and choose your units: Station Pressure in millimeters of mercury:
in HG mm HG
                          millibars (hPA)
mm HG
  Station Pressure in millibars (hectoPascals):
  mb (hPA)

Altimeter Setting Calculator
Enter the elevation of the station
and choose your units:
Altimeter Setting in in. of mercury:
feet meters in HG
Enter your station pressure
(not the altimeter setting)
and choose your units:
Altimeter Setting in mm of mercury:
in HG mm HG
                          millibars (hPA)
mm HG
  Altimeter Setting in millibars (hPa):
  mb (hPA)

Pressure Altitude Calculator
Enter your uncorrected station pressure
(not the altimeter setting):
Pressure Altitude in feet:
  in HG mm HG
                             millibars (hPA)
feet
  Pressure Altitude in meters:
  meters

Density Altitude Calculator
Enter the air temperature and choose a unit: Density Altitude in feet:
Fahrenheit Celsius
                          Kelvin
feet
Enter the actual station pressure
(not the altimeter setting) and choose a unit:
Density Altitude in meters:
in HG mm HG
                          millibars (hPA)
meters
Enter the dewpoint and choose a unit:  
Fahrenheit Celsius
                          Kelvin
 

Vapor Pressure Calculator
Enter a temperature or a dewpoint or both: Vapor Pressure
If you want the saturated vapor pressure enter the air temperature: saturated vapor pressure:
  ° F ° C
                            ° Kelvin
mb
in of HG
mm HG
hPA
kPA
lbs per square in
If you want the actual vapor pressure enter the dewpoint: actual vapor pressure:
  ° F ° C
                            ° Kelvin
mb
in of HG
mm HG
hPA
kPA
lbs per square in
If you enter both the air temperature and
the dewpoint you'll get a bonus answer.
relative humidity - requires both temp and dewpoint
  %