Pressure Altitude and Density Altitude
This is more of a conformation of formulas but they may be wrong.
The simple way to calculate pressure altitude and density altitude is -
PA=(1013-pressure)x27
This will give a possitive or negative answer which is then added or subtracted from the height of the airfield?
DA=PA +or- (Actual temp -ISA)x120
Anyone any ideas? I know there is a more complex density altitude which does into dew points and what not but just looking for a simple formula?