How to use it
- Enter indicated airspeed in knots.
- Enter altitude in feet and optional outside temperature.
- Calculate the educational TAS estimate.
True Airspeed Calculator
Apply a basic altitude and optional temperature adjustment to indicated airspeed.
Important: This calculator is an educational estimate only. It is not aviation, navigation, flight planning, fuel or reserve planning, aircraft or rocket design, certification, launch, propulsion, mission, weapon, maintenance, legal, regulatory, emergency, operational, or safety advice.
About the True Airspeed Calculator
This page demonstrates a coarse relationship between indicated speed, altitude and optional temperature.
Approximation
The base factor increases indicated speed by about 2% per 1,000 ft, with an optional square-root temperature adjustment against estimated ISA temperature.
Example
120 knots at 10,000 ft produces a base estimate near 144 knots before an optional temperature adjustment.
Notes
This does not model calibrated airspeed, compressibility, instrumentation or actual atmosphere data. It is not navigation or flight-planning information.