An online Aviation calculator to calculate the Pressure altitude. It is the height above a standard datum plane (SDP). It is the theoretical level where the weight of the atmosphere is 29.92 'Hg', which is measured by a barometer. Pressure Altitude Calculator is designed to find the value for a calculated pressure altitude, based on the specific gravity value. Specific gravity is the density of an object which is equal to its mass divided by its volume.
Pressure altitude in the above Aviation calculator can be calculated in ft and metre for the specific gravity in millibars (hPA), mm or in.