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?
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Begin by highlighting the field that corresponds to airport altitude in ft.
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Enter the 1820 value.
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Now highlight the field that corresponds to the pressure altitude in ft.
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Enter the 2530 value.
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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?:
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Begin by highlighting the field that corresponds to the altimeter setting in inHg.
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Enter the 30.14 value.
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Now highlight the field that corresponds to the pressure altitude in ft.
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Enter the 4520 value.
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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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