AIRSPEED
Airspeed Calculator
CAS · TAS · Mach · EAS · Wind & density altitude corrections
ISA standard
density-aware
Atmospheric & speed parameters
kt
ft
°C
ISA deviation (ISA = 15°C at MSL)
kt
positive = headwind · negative = tailwind
Airspeed formulas
- TAS = CAS × √(ρ₀/ρ) density correction
- Mach = TAS / (39 × √(T)) T in Kelvin
- EAS = TAS × √(ρ/ρ₀) compressibility
True airspeed
405
kt
Mach number
0.68
M
Equivalent airspeed
215
kt
Speed envelope
TAS
Mach
0 kt
600 kt
Atmospheric factors
Density ratio (ρ/ρ₀)
0.46
Temperature (ISA)
-24.0
°C
Speed of sound
594
kt
Ground speed
405
kt
Altitude-speed relationship
ISA ± deviation
SL
25,000 ft