True Airspeed Calculator

Inputs

Equivalent/CAS airspeed (EAS)

Use equivalent airspeed; for low-speed screening, calibrated airspeed is often used as an approximation.

km/h

Pressure altitude (PA)

m

Outside air temperature (OAT)

C

Results

Default result

True airspeed(TAS)

199.5km/h

Pass

Also computed

Density ratio(sigma)0.862

Air density1.056kg/m³

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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