Density Altitude Calculator

Density altitude is the standard-atmosphere altitude at which the air has the density you are actually flying in, and it takes two steps to get there. Enter the field elevation, the altimeter setting in inches of mercury or hectopascals and the outside air temperature, and it works out station pressure, pressure altitude, the ISA temperature and deviation at that level, the density ratio and the density altitude, in feet and metres; tick the dew point box and the moisture in the air is counted too. The arithmetic is the International Standard Atmosphere itself, lapse rate 1.98 C per 1000 ft, rather than the 1000 ft per inch and 120 ft per degree rules of thumb, which are printed beside the answer for comparison. It is one number and not a performance calculation: what your aeroplane will do with it comes from the takeoff and climb charts in its own flight manual at its actual weight.

Elevation Unit
Pressure Unit
Temperature Unit

Field elevation and the altimeter setting give pressure altitude; the temperature turns that into density altitude. A dew point is optional and makes the air slightly lighter still.

The elevation of the runway you are on, not your altitude in flight.
The setting that makes the altimeter read field elevation on the ground. 29.92 inHg or 1013 hPa is the standard day.
Only used when the box above is ticked.
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