Bose-x has worked out the Pressure Altitude (from Sea Level). Islander2 has worked out Aerodrome Pressure Altitude - which is what the question wanted, but is a term I've never heard of before (and probably why Bose-x's computer thingies haven't either). I'm not quite sure why you would want to know the Aerodrome Pressure Altitude...
Quite a few performance charts have pressure altitude and temperature as their entry arguments (in order to save you working out density altitude.). I am surprised you haven't heard of it!
The difference between the QFE (the
Field
Elevation pressure) and the standard 1013 hPa level (multiplied by the standard lower level correction of 30feet/hPa)
is the Aerodrome's Pressure Altitude.
