True Airspeed Calculator
SI
Imp
Imperial
Inputs
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Equivalent/CAS airspeed
(EAS)
Use equivalent airspeed; for low-speed screening, calibrated airspeed is often used as an approximation.
kt
Pressure altitude
(PA)
ft
Outside air temperature
(OAT)
C
Results
Default result
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True airspeed
(TAS)
107.7
kt
Pass
Also computed
Density ratio
(sigma)
0.862
Air density
0.066
lb/ft³
Method notes
2 notes
Uses TAS = EAS / sqrt(sigma), with sigma from ISA pressure at the entered pressure altitude and actual OAT.
This is an approximate air-data calculation. Position error, compressibility and aircraft instrumentation can change CAS/EAS/TAS conversions.
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