Density Altitude Calculator
SI
Imp
Imperial
Inputs
View results
Field elevation
(h)
Airport or runway elevation.
ft
Altimeter setting
(Alt)
Use inches of mercury for this quick aviation estimator.
inHg
Outside air temperature
(OAT)
Outside air temperature in degrees C.
C
Results
Default result
Edit inputs
Density altitude
7,801
ft
Caution
Also computed
Pressure altitude
5,000
ft
ISA temperature
5.1
C
Temperature deviation
24.9
C
120 ft/C estimate
7,989
ft
Density ratio
(sigma)
0.791
Air density
(rho)
0.060
lb/ft³
Method notes
3 notes
Pressure altitude uses field elevation + (29.92 - altimeter) * 1000 ft. The highlighted density altitude comes from dry-air density and the ISA density-altitude inversion.
The 120 ft/C output is the common quick estimate: pressure altitude + 120 ft/C * ISA temperature deviation.
Use approved performance charts, current weather, runway data and aircraft limitations for actual takeoff, climb and landing planning.
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