Using the QNH (altimeter setting) Calculator
Example 1:
If the pressure altitude at the airport is 2530 ft and the airport's altitude is 1820 ft, what is the altimeter setting?
![](images/Images_Help/Altimetry_Help_QNH01.gif)
Begin by highlighting the field that corresponds to airport altitude in ft.
![](images/Images_Help/Altimetry_Help_QNH02.gif)
Enter the 1820 value.
![](images/Images_Help/Altimetry_Help_QNH03.gif)
Now highlight the field that corresponds to the pressure altitude in ft.
![](images/Images_Help/Altimetry_Help_QNH04.gif)
Enter the 2530 value.
![](images/Images_Help/Altimetry_Help_QNH05.gif)
The remaining field is the altimeter setting. Press "Eval" and read the answer 29.16 inHg on (a). You also get a result in HPa or mbars in (b).
Example 2:
What is the airport's altitude if the altimeter setting is 30.14 inHg and the pressure altitude is 4520 ft?:
![](images/Images_Help/Altimetry_Help_QNHb01.gif)
Begin by highlighting the field that corresponds to the altimeter setting in inHg.
![](images/Images_Help/Altimetry_Help_QNHb02.gif)
Enter the 30.14 value.
![](images/Images_Help/Altimetry_Help_QNHb03.gif)
Now highlight the field that corresponds to the pressure altitude in ft.
![](images/Images_Help/Altimetry_Help_QNHb04.gif)
Enter the 4520 value.
![](images/Images_Help/Altimetry_Help_QNHb05.gif)
The remaining field is the airport altitude. Press "Eval" and read the answer 4722 ft on (a). You also get a result in meters in (b).
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