Altitude & Atmospheric Pressure


Barometric Pressure


The amount of force exerted over a surface area caused by the weight of air molecules above it. As elevation increases, fewer air molecules are present. Therefore, atmospheric pressure always decreases with increasing height. A column of air in cross section, measured from sea level to the top of the atmosphere, would weigh approximately 14.7 (psi) pounds per square inch. The standard value for atmospheric pressure at sea level is equal to ...
1 atm = 760 mm Hg (millimeters of mercury) = 1013 millibars = 14.7 psi (pounds force per square inch) = 1013.25 hPa (hectopascals).


Welcome to pressure folks, where atmospheric pressure is calculated based on height above or below sea level. I worked for awhile to get these calculators. I tried several times to make my own, but I live at a very odd altitude. I get very strange barometric pressure readings at times. Made it very difficult to produce accurate calculators so I gathered these from around the network, they are accurate as they can be. Some tell you what your pressure should be; some tell you the percents of pressure on you at a given altitude. Others tell you information about the city you live in, such as geographical information, height above sea level, and population, and geographic coordinates on a map. Enjoy the pressure.


Pressure Conversion Tools



The following conversion scripts courtesy of Tim Brice and Todd Hall of the National Weather Service in El Paso, TX

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
  %

Barometric Pressure Adjustment Standard Calculator with temperature corrections
Go HERE


Not Sure of Location Elevation, make sure you press back once you find the location elevation.
Go Here



Length Equivalents
First, type the number you wish converted here:
Then, click radio buttons for desired conversion:
From: Centimeters
Inches
Feet
Yards
Meters
Chains
Kilometers
Miles
To: Centimeters
Inches
Feet
Yards
Meters
Chains
Kilometers
Miles

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