Pressure Altitude
What is pressure altitude?
Pressure altitude is the height above the standard datum plane—the level where atmospheric pressure equals 29.92 inches of mercury ("Hg). You find it by setting your altimeter to 29.92, which removes local pressure variations and gives a standardized reference. It's the basis for performance calculations and high-altitude flight levels. Think of it as: the altitude your altimeter shows when set to the "standard" 29.92—on the test, it's the starting point before you correct for temperature to get density altitude.
Studying for an FAA written test?
Terms like pressure altitude show up on the FAA knowledge test. Study them in context with ACS-aligned practice questions, AI explanations, and the cited FAA handbook reference behind every answer — free to start.
Learn more in the library
Related terms
- practical slip limit
- precession
- precision approach
- preignition
- procedure turn
- prohibited area
- propeller blade angle
- propeller lever